U.S. patent number 3,717,002 [Application Number 05/121,788] was granted by the patent office on 1973-02-20 for method and apparatus for constructing and connecting underwater risers.
Invention is credited to Billy L. O'Brien, Heber P. O'Brien.
United States Patent |
3,717,002 |
O'Brien , et al. |
February 20, 1973 |
**Please see images for:
( Certificate of Correction ) ** |
METHOD AND APPARATUS FOR CONSTRUCTING AND CONNECTING UNDERWATER
RISERS
Abstract
An improved method and apparatus for constructing an underwater
riser from a support member, the constructed riser being formed
from a plurality of interconnected riser-sections, and for moving
the lowermost end of the constructed riser into an interconnecting
relationship with one end of an underwater pipeline, wherein one
end of each riser-section is rigidly supported by a riser support
assembly, in one position of each riser-section and in a support
position of the riser support assembly, and another riser-section
is positioned in a connecting relationship with respect to the
riser-section being supported in the riser support assembly by a
positioning assembly. In this position, the two riser-sections are
secured in an interconnecting relationship. The connecting end
portions of each riser-section are constructed such that two
riser-sections can be quickly and guidingly positioned in an
interconnecting relationship, and to facilitate a more sealingly
secure interconnection therebetween. The riser-sections thus
interconnected are lowered generally through the riser support
assembly to a position wherein the uppermost end portion of the
last connected riser-section is supported in the riser support
assembly in a position to be interconnected to another
riser-section. A predetermined number of riser-sections are thus
interconnected to form the constructed riser, and the constructed
riser is then lowered to a position wherein the lowermost end
thereof is aligned with one end of the underwater pipeline. The
lowermost end of the constructed riser is guided into an
interconnecting relationship with the end of the underwater
pipeline generally aligned therewith by a guide coupling assembly
which is removably secured in the underwater pipeline.
Inventors: |
O'Brien; Billy L. (Ada, OK),
O'Brien; Heber P. (Ada, OK) |
Family
ID: |
22398793 |
Appl.
No.: |
05/121,788 |
Filed: |
March 8, 1971 |
Current U.S.
Class: |
405/170; 166/342;
166/359; 285/18; 405/224.2; 166/345; 166/358; 269/47; 285/24 |
Current CPC
Class: |
F16L
1/15 (20130101); F16L 23/0283 (20130101); E21B
17/085 (20130101); E21B 43/01 (20130101); E21B
43/0107 (20130101) |
Current International
Class: |
F16L
1/12 (20060101); F16L 23/028 (20060101); F16L
1/15 (20060101); F16L 23/00 (20060101); E21B
17/08 (20060101); E21B 17/02 (20060101); E21B
43/00 (20060101); E21B 43/01 (20060101); F16l
035/00 (); E02b 017/00 (); B23q 001/08 () |
Field of
Search: |
;61/72.3,72.1,63,43
;285/24,18 ;166/.5,.6 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Shapiro; Jacob
Claims
What is claimed is:
1. Apparatus for constructing a riser from a marine support member
and connecting one end of the constructed riser to an underwater
pipeline, the apparatus comprising:
a predetermined number of riser-sections, interconnected to form
the constructed riser, an underwater connecting end formed on one
end of one riser-section connectingly engaging a portion of the
underwater pipeline in one position of the constructed riser,
support means formed on at least one riser-section;
an underwater connecting end connected to one end of the underwater
pipeline connectingly engaging the underwater connecting end of the
constructed riser in one position of the constructed riser;
positioning means supported on the marine support member, a portion
of the positioning means being removably connected to the support
means formed on the riser-section, to support the constructed riser
in one position of the positioning means, the positioning means
lowering the constructed riser connected thereto in a direction
generally toward the underwater pipeline in one position of the
positioning means; and
guide coupling means removably disposed in a portion of the
underwater pipeline generally near the end of the underwater
pipeline having the underwater connecting end connected thereto, a
portion of the guide coupling means guidingly engaging a portion of
the constructed riser generally near the underwater connecting end
thereof to guide the constructed riser to a position wherein the
underwater connecting end thereof connectingly engages a portion of
the underwater connecting end of the underwater pipeline.
2. The apparatus of claim 1 further defined to include:
means supported on the support member connected to a portion of the
underwater pipeline to support a predetermined length of the
underwater pipeline and the underwater connecting end connected
thereto in a horizontal plane generally above the floor of the body
of water, thereby maintaining the movement of the underwater
connecting end of the underwater pipeline and the movement of the
constructed riser relative to the movement of the support
member.
3. The apparatus of claim 1 wherein the guide coupling means is
defined further to include, a portion sealingly engaging a portion
of the underwater pipeline generally near the end thereof having
the underwater connecting end connected thereto, said portion
sealingly preventing the entry of fluid into the underwater
pipeline via the end thereof having the underwater connecting end
connected thereto.
4. Apparatus for constructing a riser from a marine support member
to be connected to an underwater pipeline, comprising:
a predetermined number of riser-sections, each riser-section having
a connecting upper end and a connecting lower end, each connecting
upper end of some of the riser-sections interconnected to the
connecting lower end of one other riser-section, the interconnected
riser-sections forming the constructed riser, support means formed
on a portion of each riser-section;
riser support means supported on the marine support member to
securedly position and support one of the riser-sections in one
position thereof, the riser support means, including:
support arm means supported on the marine support member, having a
support position and a release position, a portion of the support
arm means supportingly engaging a portion of support means of one
of the riser-sections in a support position of the support arm
means and in one position of one of the riser-sections, the support
arm means passing the interconnected riser-sections therethrough in
a release position of the support arm means; and
actuator means connected to the support arm means to position the
support arm means in a support position and in a release position;
and
positioning means supported on the marine support member, a portion
of the positioning means removably connected to a portion of the
support means of one of the riser-sections in one position of the
positioning means, the positioning means movable to a position
wherein the connecting lower end of the riser-section removably
connected thereto interconnectingly engages the connecting upper
end of a riser-section supported in the riser support means in one
position of the positioning means.
5. Apparatus for constructing a riser from a marine support member
and connecting one end of the constructed riser to an underwater
pipeline, the apparatus comprising:
a predetermined number of riser-sections, one riser-section having
a connecting upper end and an underwater connecting end, each other
riser-section having a connecting upper end a connecting lower end,
each connecting upper end of some of the riser-sections
interconnected to the connecting lower end of one other
riser-section, the interconnected riser-sections forming the
constructed riser, the underwater connecting end of the one
riser-section being the underwater connecting end of the
constructed riser, support means formed about a portion of each
riser-section generally near the connecting upper end thereof;
riser support means supported on the marine support member to
support one riser-section therein in one position thereof, the
riser support means including:
support arm means supported on the marine support member having a
support position and a release position, a portion of the support
arm means supportingly engaging a portion of the support means of
one of the riser-sections in a support position of the support arm
means and in one position of one of the riser-sections, the support
arm means passing the interconnected riser-sections therethrough in
a release position of the support arm means; and
actuator means connected to the support arm means to position the
support arm means in a support position and in a release position;
and
positioning means supported on the marine support member, a portion
of the positioning means being removably connected to the support
means of one of the riser-sections in one position of the
positioning means, the positioning means movable to a position
wherein the connecting lower end of the riser-section removably
connected to the positioning means interconnectingly engages the
connecting upper end of the riser-section supported in the riser
support means in one position of the positioning means;
an underwater connecting end connected to one end of the underwater
pipeline, a portion of the underwater connecting end of the
underwater pipeline interconnectingly engaging the underwater
connecting end of the constructed riser in one position of the
constructed riser and the underwater pipeline; and
guide coupling means removably disposed in a portion of the
underwater pipeline generally near the end of the underwater
pipeline having the underwater connecting end connected thereto, a
portion of the guide coupling means guidingly engaging a portion of
the constructed riser generally near the underwater connecting end
thereof to guide the constructed riser to a position wherein the
underwater connecting end of the constructed riser connectingly
engages a portion of the underwater connecting end of the
underwater pipeline.
6. The apparatus of claim 5 defined further to include:
riser lowering means supported on the marine support member, a
portion of the riser lowering means removably connected to a
portion of the support means of one of the riser-sections in one
position of the riser lowering means, the riser lowering means
guidingly lowering the constructed riser in a direction generally
toward the underwater connecting end of the underwater pipeline, to
a position wherein the underwater connecting end of the constructed
riser connectingly engages the underwater connecting end of the
underwater pipeline.
7. The apparatus of claim 5 wherein the support means formed on the
riser-sections is defined further as being a support ring formed on
the outer periphery of each riser-section, generally near the
connecting upper end thereof and extending generally radially
therefrom, thereby forming an annular upper surface and an annular
lower surface extending circumferentially about the outer periphery
of each riser-section.
8. The apparatus of claim 7 wherein the support ring is defined
further to include a predetermined number of position apertures
formed therethrough.
9. The apparatus of claim 7 wherein the support ring is defined
further to include a predetermined number of support apertures
formed therethrough.
10. The apparatus of claim 8 wherein the support arm means is
defined further to include:
at least two support arms, each support arm having a pivot end and
a support end, the pivot end of each support arm pivotally secured
to a portion of the marine support member, the support arm of each
support arm supportingly engaging a portion of the lower surface of
the support ring of each riser-section in a support position of the
support arm means and in one position of each riser-section;
and
wherein the actuator means is defined further to include:
at least two cylinder actuator means, each
cylinder actuator means pivotally connected to the marine support
member and having a piston arm reciprocatingly disposed therein,
one end of each piston arm pivotally connected to a portion of one
of the support arms, each cylinder actuator means actuable to move
the support arm means connected thereto to a support position and a
release position.
11. The apparatus of claim 10 wherein the support end of each
support arm is defined further to include:
a base having an upper surface formed thereon, the upper surface
being arcuately shaped and supportingly engaging a portion of the
lower surface of the support ring of each riser-section in one
position of each riser-section; and
a predetermined number of locating pins, each locating pin secured
to a portion of the upper surface of the base and extending a
distance generally perpendicularly therefrom, each locating pin
extending through a portion of one of the position apertures of
each riser-section in one position of each riser-section, to
position each riser-section in a support position of the
riser-support means and in one position of each riser-section.
12. The apparatus of claim 11 defined further to include at least
one locating pin secured to the base of each support arm, and
wherein the support arms are further defined as being generally
disposed on opposite sides of the riser-section supported in the
riser support means, the locating pins being spaced approximately
180.degree. apart, in a support position of the riser support
means.
13. The apparatus of claim 5 defined further to include:
means to support a plurality of riser-sections in a stored position
on the marine support member, for subsequent utilization in the
construction of the riser; and
wherein the positioning means is defined further to include:
a track means supported in a horizontal plane generally above the
riser support means and the stored riser-sections; and
a crane support frame rollingly connected to the track means, the
crane support frame rollable on the track means to predetermined
positions over the stored riser-sections and over the riser support
means;
a crane winch means supported on a portion of the crane support
frame, having an actuated raising and an actuated lowering
position;
a crane cable means, having opposite ends, one end of the crane
cable means being connected to the crane winch means; and
a riser section connector secured to the end of the crane cable
means opposite the end thereof secured to the crane winch means;
and the riser section connector securedly engaging one of the
supported riser-sections in one position thereof, the riser-section
connected to the riser section connector being raised in a
generally vertical direction toward the track means in the actuated
raising position of the crane winch means, the riser-section
connected to the riser section connector being lowered in a
generally downwardly direction toward the riser support means in an
actuated lowering position of the crane winch means.
14. The apparatus of claim 13 wherein the track means is defined
further to include:
a lateral track means disposed in a horizontal plane generally
above the riser support means and the supported riser-sections, the
lateral track means extending generally laterally over the riser
support means and the supported riser-sections; and
a transverse track means extending generally transversely with
respect to the lateral track means, the transverse track means
rollingly connected to the lateral track means, the transverse
track means being laterally positionable on the lateral track;
and
wherein the crane support frame is more particularly connected to
the transverse track means, the crane support frame being
positionable transversely on the transverse track means.
15. The apparatus of claim 6 wherein the riser lowering means is
defined further to include:
at least two winch means, each winch means supported on a portion
of the marine support member and spaced approximately 180.degree.
apart, each winch means having an actuated raising and an actuated
lowering position; and
a winch cable connected to each winch means, each winch cable
having opposite ends, one end of each winch cable secured to one of
the winch means and the end of each winch cable opposite the end
thereof secured to one of the winch means removably connected to a
portion of the interconnected riser-sections, the interconnected
riser-sections being lowered via the winch cables in an actuated
lowering position of each winch means, and the interconnected
riser-sections being raised by each winch cable in an actuated
raising position of each winch means.
16. The apparatus of claim 5 defined further to include:
a riser section receiving means supported on the marine support
member, a portion of the riser section receiving means receivingly
and supportingly engaging a portion of one riser-section for
temporarily storing one riser-section therein
17. The apparatus of claim 5 defined further to include:
a portable support frame removably connected to a portion of the
marine support member in as assembled position thereabove;
a base plate means secured to the support frame, a riser opening
formed through a portion of the base plate having a diameter larger
than the largest radial diameter of any portion of any of the
riser-sections, the riser support means connected to the base plate
generally near the riser opening therethrough; and
a plurality of telescoping connectors, each telescoping connector
having opposite ends, one end of each telescoping connector being
connected to a portion of the base plate, the ends of the
telescoping connectors opposite the ends thereof secured to the
base plate being positionable in predetermined horizontal planes
above the base plate to a transport position and to an assembled
position; and
wherein the riser positioning means is further defined as being
supportably connected to the end of each telescoping connector
opposite the end thereof secured to the base plate, the horizontal
disposition of the positioning means with respect to the base plate
thereby adjustable to a transport position and an assembled
position following the positioning of the telescoping
connectors.
18. The apparatus of claim 17 wherein the base plate is defined
further to include a plurality of support apertures formed
therethrough, a portion of the base plate generally adjacent each
support aperture supportingly engaging a portion of the support
means of one riser-section to storingly support the riser-section
in a stored position.
19. The apparatus of claim 5 wherein the connecting upper end of
each riser-section is defined further to include an uppermost end
and a groove formed in the inner periphery of each riser-section
intersecting a portion of the uppermost end thereof and extending a
distance axially along the inner periphery thereof terminating with
a beveled end, the beveled end of the groove forming an annular
beveled surface in the connecting upper end of each riser-section;
and wherein the connecting lower end of each riser-section is
defined further to include a lowermost end and a groove formed in
the outer periphery of each riser-section intersecting a portion of
the lowermost end thereof extending a distance axially along the
outer periphery thereof terminating with an annular end surface
formed about the outer periphery of the connecting lower end of
each riser-section, the annular end surface formed about the
connecting lower end of each riser-section engaging a portion of
the uppermost end of the connecting lower end of one other
riser-section in an interconnecting position of two riser-sections,
the lowermost end of the connecting lower end of each riser-section
engaging a portion of the annular beveled surface formed in the
connecting lower end of one other riser-section in an
interconnecting position of two riser-sections.
20. The apparatus of claim 19 wherein the support means formed
about each riser-section is defined further as being a support ring
formed on the outer periphery of the connecting upper end portion
of each riser-section generally near the uppermost end thereof,
extending a distance radially therefrom.
21. The apparatus of claim 19 wherein the lowermost end of the
connecting lower end of each riser-section is formed on a bevel,
thereby providing an annular beveled surface extending about a
portion of the outer periphery of the lowermost end of each
connecting lower end, the annular beveled surface of each
connecting lower end matingly and connectingly engaging the annular
beveled surface formed about the inner periphery of the connecting
upper end of one other riser-section in an interconnecting position
of two riser-sections.
22. The apparatus of claim 19 wherein the lowermost end of the
connecting lower end of each riser-section is formed on a bevel,
thereby providing an annular beveled surface extending about a
portion of the outer periphery of the lowermost end of each
connecting lower end, the annular beveled surface of each
connecting lower end and the annular beveled surface of each
connecting upper end forming an annular V-shaped groove in an
interconnecting position of two riser-sections to facilitate the
welding interconnection therebetween.
23. The apparatus of claim 5 wherein the underwater connecting end
of the one riser-section is defined further to include, a lowermost
end and a radially outwardly tapering groove formed in the outer
periphery of the underwater connecting end of the one riser-section
intersecting a portion of the lowermost end thereof thereby forming
an annular tapered surface extending about the outer periphery of
the underwater connecting end of the one riser-section; and wherein
the underwater connecting end connected to the underwater pipeline
is defined further to include, an uppermost end and a radially
inwardly tapering groove formed in the inner periphery thereof,
intersecting a portion of the uppermost end thereof, forming an
annular tapered surface extending about a portion of the inner
periphery of the underwater connecting end connected to the
underwater pipeline, the annular tapered surface of the underwater
connecting end connected to the underwater pipeline guidingly and
matingly engaging the annular tapered surface of the underwater
connecting end of the one riser-section in an interconnected
position of the constructed riser and the underwater pipeline.
24. The apparatus of claim 5 wherein the underwater connecting end
of the one riser-section is defined further to include, a lowermost
end and a groove formed in the outer periphery thereof extending a
distance axially along the outer periphery thereof, a portion of
the groove tapered radially outwardly thereby forming an annular
tapered surface extending about the outer periphery of the
underwater connecting end of the one riser-section, a portion of
the tapered surface intersecting a portion of the outer periphery
of the underwater connecting end of the one riser-section; and
wherein the underwater connecting end connected to the underwater
pipeline is defined further to include, an uppermost end and a
groove formed in the inner periphery thereof extending a distance
axially along the inner periphery thereof, a portion of the groove
tapered radially outwardly thereby forming an annular tapered
surface extending about the inner periphery of the underwater
connecting end connected to the underwater pipeline, a portion of
the tapered surface intersecting a portion of the uppermost end of
the underwater connecting of the underwater pipeline, the surface
formed by the groove and the annular tapered surface of the
underwater connecting end connected to the underwater pipeline
guidingly and matingly engaging the surface formed by the groove
and the annular tapered surface, respectively, of the underwater
connecting end of the one riser-section in an interconnected
position of the constructed riser and the underwater pipeline.
25. The apparatus of claim 5 wherein the underwater connecting end
connected to the underwater pipeline is defined further to include;
an annular flange formed on the outer periphery thereof, extending
generally radially therefrom and an annular raised face formed on a
portion of the flange extending generally axially from the annular
flange terminating with an uppermost end, the uppermost end of the
annular raised face forming the uppermost end of the underwater
connecting end connected to the underwater pipeline; and wherein
the underwater connecting end of the one riser-section is defined
further to include, an annular flange formed on the outer periphery
thereof, extending generally radially therefrom, thereby forming an
annular downwardly facing surface and an annular upwardly facing
surface, each extending about the outer periphery of the underwater
connecting end of the one riser-section, the annular downwardly
facing surface engaging the uppermost end of the underwater
connecting end connected to the underwater pipeline in an
interconnected position of the constructed riser and the underwater
pipeline.
26. The apparatus of claim 25 wherein the underwater connecting end
of the one riser-section is defined further to include:
an annular slip ring disposed about the underwater connecting end
of the one riser-section, a portion of the annular slip ring
slidingly engaging the upwardly facing surface formed by the flange
about the outer periphery of the underwater connecting end of the
one riser-section, the slip ring being supported in one direction
thereby, a plurality of bolt holes being formed through a portion
of the slip ring and spaced circumferentially thereabout; and
wherein the flange formed about the underwater connecting end
connected to the underwater pipeline, is defined further to include
a plurality of bolt holes formed therethrough, the bolt holes
spaced circumferentially about the flange and positioned to align
with the bolt holes formed in the slip ring, in one position of the
slip ring, for bolting interconnection between the constructed
riser and the underwater pipeline.
27. The apparatus of claim 26 defined further to include; flange
alignment means supported generally between the underwater
connecting end of the one riser-section and the underwater
connecting end connected to the underwater pipeline to align the
bolt holes of the flange of the underwater connecting end connected
to the underwater pipeline with the bolt holes through the slip
ring supported on the one riser-section.
28. The apparatus of claim 27 wherein the flange alignment means is
defined further to include:
a pin having an upper and lower end, the pin disposed through one
of the bolt holes in the slip ring and one of the bolt holes of the
flange of the underwater connecting end connected to the underwater
pipeline, in one position;
a clamp means connected to the pin generally adjacent the upper end
thereof, the clamp means engaging a portion of the slip ring in one
position of the clamp means to secure the pin in an assembled
position, a portion of the pin extending through one of the bolt
holes in the slip ring and a portion of the pin generally adjacent
the lower end thereof extending a distance downwardly from the slip
ring in an assembled position of the pin; and
a pair of guide members, each guide member removably supported on a
portion of the flange formed on the underwater connecting end
connected to the underwater pipeline and extending a distance
generally upwardly therefrom, each guide member having a guide
side, the guide sides of the two guide members defining a guide
path in an assembled position of the guide members, each guide side
alternately and guidingly engaging a portion of the pin generally
adjacent the lower end of the pin in one position of the pin, to
guide a portion of the pin through one of the bolt holes of the
flange formed on the underwater connecting end connected to the
underwater pipeline.
29. The apparatus of claim 5 wherein the guide coupling means is
defined further to include:
a support base having an upper and lower end, a portion of the base
removably disposed in a portion of the underwater pipeline
generally near the underwater connecting end connected thereto, in
an assembled position of the guide coupling means;
means supported on a portion of the support base to securedly
position the guide coupling means in an assembled position in a
portion of the underwater pipeline; and
a cone-shaped guide having an upper end and a circular-shaped lower
end, the lower end of the cone-shaped guide connected to the upper
end of the support base, the cone-shaped guide extending axially
above the uppermost end of the underwater connecting end connected
to the underwater pipeline, in an assembled position of the guide
coupling means, the outer surface of the cone-shaped guide
providing a guiding surface guidingly engaging a portion of the
underwater connecting end of the one riser-section to guide the
underwater connecting end of the one riser-section into an
interconnecting engagement with the underwater connecting end
connected to the underwater pipeline.
30. The apparatus of claim 29 wherein the means to securedly
position the guide coupling means in the underwater pipeline is
defined further to include:
a jaw member pivotally secured to a portion of the support base, a
portion of the jaw member extending radially from the support base
and engaging a portion of the underwater connecting end connected
to underwater pipeline to securedly position the guide coupling
means in one direction in the underwater pipeline, in one position
of the jaw member;
a bias spring, having opposite ends, one end of the bias spring
connected to a portion of the jaw member and the end of the bias
spring opposite the end thereof connected to the jaw member
connected to a portion of the support base, the bias spring biasing
the jaw member in a biasing direction; and
a plate means secured to a portion of the support base, a portion
of the jaw member engaging the plate means to limit the pivotal
movement of the jaw member in a biasing direction to a position
wherein a portion of the jaw member engages a portion of the
underwater connecting end connected to the underwater pipeline to
position the guide coupling means in an assembled position in the
underwater pipeline.
31. The apparatus of claim 29 further defined to include:
an annular seal member, having an annular seal end and an annular
tapered surface formed thereon, a portion of the seal member
opposite the seal end thereof sealingly connected to a portion of
the support base, the annular seal end of the seal member slidingly
engaging an adjacent portion of the inner periphery of the
underwater pipeline, the annular tapered surface of the seal end
engaged by fluid entering the underwater pipeline via the
underwater connecting end thereof, the fluid biasing the seal end
of the seal member into sealing engagement with the adjacent
portion of the inner periphery of the underwater pipeline thereby
forming a fluid seal between the guide coupling means and the
underwater pipeline, in one position of the seal member.
32. The apparatus of claim 31 defined further to include: a seal
bias means supported in a portion of the support base, the seal
bias means having a portion thereof biasingly engaging a portion of
the annular tapered surface of the seal member thereby biasing the
seal end of the seal member into sealing engagement with an
adjacent portion of the inner periphery of the underwater pipeline,
in one position of the seal bias means.
33. The apparatus of claim 32 wherein the seal bias means is
defined further to include:
an elongated rod, having opposite ends, reciprocatingly supported
in a portion of the support base;
a predetermined number of flanges, each flange being connected on
one end thereof to a portion of the rod generally near one end of
the rod, each flange extending a distance radially from the rod
terminating with an outer end portion;
an annular bias ring having a portion thereof connected to the
outer end portion of each flange, the bias ring biasingly engaging
the annular tapered surface of the seal member, thereby biasing the
seal end of the seal member into sealing engagement with the
adjacent portion of the inner periphery of the underwater pipeline,
in one position of the bias ring; and
a bias spring disposed about a portion of the rod, one end of the
bias spring engaging a portion of the support base, the end of the
bias spring opposite the end thereof in engagement with the support
base engaging a portion of the flanges thereby biasing the rod in a
bias direction wherein the seal ring biasingly engages the annular
tapered surface of the seal member, the bias spring thereby
augmenting the sealing integrity of the seal member with respect to
the inner periphery of the underwater pipeline.
34. The apparatus of claim 33 defined further to include:
means to move the rod in a direction generally opposite the biasing
direction and to support the rod in a position wherein the bias
ring is disengaged from the seal member; and
means to move the rod in a biasing direction to augment the biasing
force of the bias spring, thereby augmenting the sealing integrity
between the seal member and the adjacent portion of the inner
periphery of the underwater pipeline in one position.
35. The apparatus of claim 31 defined further to include:
a submergable pump means supported in a portion of the guide
coupling means to remove fluid accumulated in a portion of the
underwater pipeline generally near the underwater connecting end
connected thereto and to remove fluid accumulated in the riser
subsequent to the constructed riser being interconnected to the
underwater pipeline.
36. The apparatus of claim 5 defined further to include: a slip
coupling means interposed in a portion of the underwater pipeline
generally near the end of the underwater pipeline having the
underwater connecting end connected thereto, a portion of the
underwater pipeline between the end thereof having the underwater
connecting end connected thereto and the slip coupling rotatable
generally about the slip coupling to facilitate the positioning of
the underwater pipeline to be interconnected to the constructed
riser.
37. A method for connecting an underwater connecting end of a riser
to an underwater connecting end of an underwater pipeline, the
connection between the riser and the underwater pipeline being
generally below the surface of and near the floor of the body of
the water, the method comprising:
supporting the riser from the marine support member;
supporting a portion of the underwater pipeline and the underwater
connecting end thereof from the marine support member generally
above the floor of the body of water; and
lowering the riser to a position wherein the underwater connecting
end thereof interconnectingly engages a portion of the underwater
connecting end of the underwater pipeline.
38. A method for constructing a riser of a plurality of
riser-sections to be connected to an underwater pipeline, the
method comprising:
supporting one end of one of the riser-sections on the support
member;
positioning the end of another riser-section in connecting
engagement with one end of the riser-section supported on the
support member;
securing the riser-section supported on the support member to the
riser-section in connecting engagement therewith;
lowering the interconnected riser-sections a predetermined
distance;
supporting the last connected riser-section from the support
member;
positioning another riser-section in a connecting engagement with
respect to the last connected riser-section supported from the
support member;
securing the riser-section supported from the support member to the
riser-section positioned in a connecting engagement therewith;
and
repeating the last two mentioned steps a predetermined number of
times to interconnect a predetermined number of riser-sections to
form the riser; and
lowering the interconnected riser-sections to a position wherein
the lower end of the first connected riser-section connectingly
engages the underwater pipeline.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to improvements in methods and
apparatus for constructing and installing underwater pipelines and,
more particularly, but not by way of limitation, to a method and
apparatus for constructing an underwater riser and an underwater
pipeline to facilitate the underwater interconnection
therebetween.
2. Description of the Prior Art
Offshore marine structures, commonly referred to in the art simply
as "platforms" are installed in a marine environment, and are
generally utilized to support structures and equipment during
various offshore operations. In the past, one of the most common
usages of such platforms has been with respect to the offshore
drilling and production of an oil and gas well.
In connection with such platforms, various underwater pipelines are
commonly utilized to transport a fluid to or from various remote
locations with respect to the platform. These pipelines generally
include an underwater pipeline, which is disposed on the water-body
floor, and a pipeline, which is commonly referred to in the art as
a "riser," vertically disposed, generally adjacent or near the
offshore platform. The lowermost end of the riser is generally
connected to one end of the underwater pipeline, in an assembled
position of the riser and underwater pipeline.
Various methods and apparatus have been proposed in the past for
constructing and installing the underwater pipelines and the
risers, and for making the underwater connection between the riser
and the underwater pipeline. One such method utilized in the past,
basically comprised the bending of a portion of the underwater
pipeline in a generally upward direction, the portion of the
underwater pipeline extending upwardly from the bend thereby
forming the pipeline riser. This particular method, although
adequate for extremely small sizes of pipe, is not of a nature that
it could be successfully utilized to construct underwater pipelines
and risers which are of a relatively large size, as commonly
associated with the offshore production of oil and gas.
In the past, the underwater pipeline has been constructed of
various pipeline sections which were interconnected aboard a
support member or, more particularly, a barge, and the
interconnected pipeline sections were then laid on the water-body
floor from the barge. The pipeline riser was basically constructed
of the plurality of riser-sections which were also interconnected
aboard the barge and "stovepiped" or, in other words, lowered into
an interconnecting relationship with one end of the underwater
pipeline. The riser-sections were supported by cables generally on
one side of the barge in a somewhat interconnecting relationship,
and the riser-sections were then welded together at the
interconnection therebetween while being thus supported.
Not only was this procedure, generally described above, for
constructing and connecting an underwater riser hazardous with
respect to the various operating personnel involved, but it has
also been found that when utilizing such a method it was virtually
impossible to assure a good, substantially 100 percent X-ray weld,
with respect to the welded interconnections between the various
riser-sections. Although the inability to achieve an adequate
welded connection between the various riser-sections was generally
due to the relative movement of the two riser-sections being
connected during the welding or connecting procedure, it has also
been found that the construction of the riser-sections per se made
a sealingly secure, welded interconnection substantially difficult
to achieve. In practice, it was the general operating procedure to
secure a sufficient amount of weld material generally about the
interconnection between the riser-sections to merely assure a
connection therebetween. The weld material was then ground-down,
and the interconnection re-welded, in an effort to achieve a
maximum security weld. It should also be noted that even in those
instances where the riser-sections were bolted together and a
gasket interposed therebetween to provide the sealing security, it
has been found that in many instances the gasket was completely or
partially destroyed during the interconnection of the two
riser-sections, utilizing the connecting procedure, as generally
described above.
Since a portion of one of the riser-sections being interconnected
was generally partially disposed in the water-body during the
connecting procedure, it has been found that, in many instances,
full crews of men and machinery were idled during a high-tide or a
generally rough water condition. Thus, not only were the procedures
for constructing and installing underwater risers hazardous and the
interconnections between the various riser sections relatively
unsecure, but also these procedures were extremely inefficient and
costly.
SUMMARY OF THE INVENTION
An object of the invention is to provide a method and apparatus for
constructing an underwater riser wherein the sealing integrity
between the interconnected riser-sections is substantially
increased.
Another object of the invention is to provide a method and
apparatus for constructing an underwater riser in a manner assuring
the safety of the various operating personnel and which is
economical in construction and operation.
One other object of the invention is to provide a method and
apparatus for constructing an underwater riser and connecting one
end of the constructed riser to one end of an underwater pipeline,
wherein the alignment of the riser with the end of the underwater
pipeline is accomplished in a faster, more efficient and more
positive manner.
A further object of the invention is to provide a method and
apparatus for constructing an underwater riser wherein the required
construction time is substantially reduced.
A still further object of the invention is to provide a method and
apparatus for constructing an underwater riser and for connecting
one end of the constructed riser to one end of an underwater
pipeline which is economical in construction and operation.
Another object of the invention is to provide a guide coupling for
aligning the ends of two pipelines to be interconnected in a more
efficient and positive manner.
One further object of the invention is to provide a guide coupling
for guidingly aligning the ends of two pipelines to be
interconnected, which is economical in construction and
operation.
One other object of the invention is to provide a guide coupling
apparatus to guide one end of a pipeline into an interconnecting
relationship with one end of another pipeline particularly useful
in effecting underwater connections.
Another object of the invention is to provide a riser-section
constructed to be economically and efficiently connected to another
riser-section.
A still further object of the invention is to provide a method and
apparatus for positioning an underwater pipeline in an
interconnecting alignment with a riser in a faster, more efficient
and more economical manner.
Other objects and advantages of the invention will be evident from
the following detailed description when read in conjunction with
the accompanying drawings which illustrate the various embodiments
of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side elevational view of a marine support member, more
particularly, a platform having a riser construction apparatus
supported thereon for constructing a riser and for connecting the
constructed riser to one end of an underwater pipeline.
FIG. 2 is a top plan view of the riser construction apparatus of
FIG. 1.
FIG. 3 is an enlarged, side elevational view showing a preferred
embodiment of a portion of a riser support assembly constructed to
be utilized in cooperation with the riser construction apparatus of
FIG. 1.
FIG. 4 is a side elevational view of a modified riser construction
apparatus, similar to the riser construction apparatus of FIG. 1,
but having an insertable, removable support structure.
FIG. 5 is a partial, enlarged sectional view showing a pair of
interconnected riser-sections constructed to be utilized in
cooperation with the riser construction apparatus of FIG. 1.
FIG. 6 is a sectional view of the riser-sections of FIG. 5, taken
substantially along lines 6--6 of FIG. 5.
FIG. 7 is a sectional view, similar to FIG. 5, but showing a
modified pair of interconnected riser-sections.
FIG. 8 is an enlarged, sectional view showing a preferred
embodiment of the guide-coupling apparatus of FIG. 1.
FIG. 9 is an enlarged, sectional view showing a portion of the
riser and a portion of the underwater pipeline of FIG. 8 in an
interconnected position.
FIG. 10 is a sectional view, similar to FIG. 8, but showing a
modified guide-coupling apparatus.
FIG. 11 is an enlarged sectional view, similar to FIG. 9, but
showing a modified riser and underwater pipeline
interconnection.
FIG. 12 is an enlarged, elevational view showing a flange alignment
apparatus utilized to align the bolt holes in the riser and the
underwater pipeline for bolting interconnection therebetween.
FIG. 13 is a top elevational view of the end of the underwater
pipeline of FIG. 12 having the guide coupling apparatus removed
therefrom, and a portion of a pin guide assembly positioned
therein.
FIG. 14 is a partial, side elevational view of the flange alignment
apparatus of FIG. 12.
FIG. 15 is a diagrammatical, side elevational view showing a riser
construction and connection apparatus for constructing a riser and
connecting the riser to an underwater pipeline from a barge type
support member.
FIG. 16 is a partial diagrammatical, side elevational view showing
a portion of an underwater pipeline and apparatus for moving the
underwater pipeline into an interconnecting position with respect
to an underwater riser being constructed from a platform.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to the drawings in general, and to FIGS. 1, 2 and 3 in
particular, shown therein and designated by the general reference
10 is a riser construction apparatus for constructing a riser 12 by
securedly interconnecting a predetermined number of riser-sections
14 from a support member 16, and connecting one end of the
constructed riser 12 to an underwater pipeline 18. The riser
construction apparatus 10 is supported in an assembled position
upon the support member 16 which is, more particularly, an offshore
platform or, in other words, a platform which is supported on a
floor 20 of a body of water 22, a portion of the platform 16 being
disposed in a body of water 22 generally below a surface 24
thereof. The platform 16 may be of the type commonly utilized with
respect to various offshore operations relating to the drilling and
production of oil and gas, for example, and basically comprises: a
plurality of support legs 26, which are anchored in the floor 20 of
the body of water 22; and a plurality of brace members 28, which
are securedly interconnected to the support legs 26 (only two of
the brace members 28 and only two of the support legs 26 are shown
in FIG. 1, for the purpose of clarity of description).
As shown more clearly in FIG. 1, the platform 16 includes a first
operating deck 30 supported thereon generally above the surface 24
of the body of water 22. A portion of the first operating deck 30
is secured to a portion of each of the support legs 26, and is
generally supported on the platform 16 thereby. A second operating
deck 32 is supported by the support legs 26 on the platform 16, a
distance generally above the first operating deck 30. The first and
the second operating decks 30 and 32 may be of the type generally
adapted to support various well-drilling and servicing equipment
and, in some installations, the second operating deck 32 may be
removable for temporary utilization during certain portions of the
overall construction operation. The construction and utilization of
various offshore support members, such as the platform 16,
generally described above, is well known in the art and a detailed
description thereof is not required herein.
As shown more clearly in FIGS. 1 and 2, the riser construction
apparatus 10 generally includes: a riser support assembly 34 and a
riser lowering assembly 36, each being supported on a portion of
the first operating deck 30; and a positioning assembly 38
supported on a lower side portion of the second operating deck 32,
generally between the first operating deck 30 and the second
operating deck 32. Although the riser construction apparatus 10 can
be securedly connected directly to various portions of the support
member 16 and supported thereby, in a preferred form, and as shown
in FIGS. 1, 2 and 3, the support assembly 34 and the riser lowering
assembly 36 are, more particularly, securedly supported on a base
plate 40 which is connected to a support frame 42, in a manner to
be described in more detail below.
The support frame 42 is securedly connected to and supported upon a
portion of the first operating deck 30, and basically comprises a
plurality of structural members 44 (one of the structural members
44 being shown in FIG. 1), such as, for example, I-beams, which are
interconnected to form a generally rectangularly shaped support
structure. The base plate 40 has opposite ends 46 and 48 and
opposite sides 50 and 52. In actual practice, additional structural
members may be interconnected and secured generally between the
opposite ends 46 and 48 and the opposite sides 50 and 52 to provide
additional supporting strength for the support frame 42. In view of
the detailed description of the riser construction apparatus 10
below, the precise construction of a support frame and the precise
interconnection of the various structural members will be apparent
to those skilled in the art and a detailed description thereof is
not required herein.
As shown more clearly in FIG. 2, the base plate 40 includes a
plurality of support apertures 54 formed therethrough. It should be
particularly noted that the first operating deck 30 also has
apertures formed therethrough (not shown) aligned with the support
apertures 54 in the base plate 40 or, at least, the first operating
deck 30 has an opening therethrough positioned such that
riser-sections 14 can be positioned through the support apertures
54. Each support aperture 54, more particularly, is sized to
receive one of the riser-sections 14 such that a portion of the
base plate 40 supportingly engages a portion of the riser-section
14 to storingly support the riser-section 14 disposed therein in a
stored position for subsequent utilization in the construction of
the riser 12, for reasons and in a manner to be described in
greater detail below.
As generally shown in FIGS. 1, 2 and 3, each riser-section 14 has a
connecting upper end 56 and a connecting lower end 58 formed
thereon. The connecting upper end 56 of each riser-section 14 is
shaped to interconnectingly mate with the connecting lower end 58
of another riser-section 14, in such a manner that the
riser-sections 14 can be securedly joined to form the riser 12. In
a preferred form, the connecting lower end of one of the
riser-sections 14 is, more particularly, an underwater connecting
end and is positioned or interconnected to the other riser-sections
14 to form an underwater connecting end of the constructed riser 12
in a manner to be described in greater detail below.
A support ring 60 is formed about the outer periphery of each
riser-section 14, generally near the connecting upper end 56
thereof, as shown in FIGS. 1, 2 and 3. Each support ring 60 extends
a distance generally radially from one of the riser-sections 14.
More particularly, each support ring 60 is shaped and sized to
extend a sufficient distance from one of the riser-sections 14,
such that when one of the riser-sections 14 is lowered into a
stored position through one of the support apertures 54, a portion
of the support ring 60 engages a portion of the base plate 40,
generally adjacent the support aperture 54, the riser-section 14
being thus supported in a stored position therein. It should also
be noted that the support ring 60 of each riser-section 14 is also
shaped and disposed to engagingly contact a portion of the riser
support assembly 34, in one position of the riser support assembly
34, during the construction of the riser 12, in a manner and for
reasons which will be described in greater detail below.
In a preferred form and as shown more clearly in FIG. 2, a pair of
position apertures 62 are formed through a portion of each support
ring 60. The position apertures 62 are spaced approximately
180.degree. apart and are sized and positioned on each support ring
60 to cooperate with the riser support assembly 34 such that one of
the riser-sections 14 is securedly positioned and supported therein
in one position of the riser support assembly 34, as will be
described in greater detail below.
A pair of support apertures 64 are also formed through a portion of
each support ring 60, as shown in FIG. 2. The support apertures 64
are spaced approximately 180.degree. apart, and each support
aperture 64 is spaced approximately 90.degree. from each position
aperture 62. The support apertures 64 are sized and positioned on
each support ring 60 to cooperate with the lowering assembly 36
such that the interconnected riser-sections 14 can be lowered
through the riser support assembly 34, in one position of the riser
support assembly 34 and in one position of the lowering assembly
36, in a manner to be described in greater detail below.
As shown more clearly in FIGS. 2 and 3, the riser opening 66 is
formed through a central portion of the base plate 40, and the
riser opening 66 is also centrally disposed with respect to the
riser support assembly 34. The riser opening 66 is sized such that
the interconnected riser-sections 14 can be passed therethrough,
more particularly, the riser opening 66 has a diameter larger than
the largest radial diameter of any portion of any of the
riser-sections 14, for reasons which will be made apparent below.
It should be particularly noted that the first operating deck 30
also has apertures (not shown) formed therethrough or, at least, an
opening therethrough positioned such that interconnected
riser-sections 14 can be passed through the riser opening 66 during
one portion of the operation of the riser construction apparatus
10, for reasons and in a manner to be described in more detail
below.
As shown in FIGS. 1, 2 and 3, the riser support assembly 34 is
secured to and supported upon a portion of the base plate 40,
generally about or near the riser opening 66. The riser support
assembly 34 has a support position, and is constructed to securedly
position and to supportingly engage one of the riser-sections 14
or, more particularly, a portion of the support ring 60 of one of
the riser-sections 14, in a support position of the riser support
assembly 34. The riser support assembly 34 also has a release
position, and is constructed to non-engagingly pass the
interconnected riser-sections 14 therethrough, in a release
position thereof, in a manner to be described in greater detail
below.
The riser support assembly 34 includes a pair of support arm
assemblies 70 secured to a portion of the base plate 40, generally
adjacent the riser opening 66, and a pair of actuator assemblies 72
which are secured to a portion of the base plate 40. Each actuator
assembly 72 is connected to one of the support arm assemblies 70 to
move the support arm assemblies 70 to a support position and a
release position, in a manner to be described in detail below.
Each support arm assembly 70 includes a support arm 74, as shown
more clearly in FIGS. 2 and 3. Each support arm 74 has a pivot end
76 and a support end 78. The pivot end 76 of each support arm 74 is
pivotally secured to the support member 16 and, more particularly,
each pivot end 76 is pivotally secured to a flange 80 via a pin 82,
as shown more clearly in FIG. 3. Each flange 80 is secured to the
base plate 40, and positioned thereon such that, in the assembled
position of the riser support assembly 34, the support arms 74 are
spaced approximately 180.degree. apart, for reasons which will be
made apparent below.
In a preferred form, each support arm 74 has a base 84 formed on
the support end 78 thereof, and each base 84 has an upper
supporting surface 86 formed thereon. Each upper surface 86 is
arcuately shaped and sized to supportingly engage a portion of the
support ring 60 of one of the riser-sections 14, in a support
position of the riser support assembly 34.
A locating pin 88 is formed or, more particularly, secured to a
portion of the upper surface 86 of each base 84. Each locating pin
88 extends generally perpendicularly from the upper surface 86, and
is sized to positioningly extend through a portion of one of the
position apertures 62 of the riser-section 14 being supported by
the riser support assembly 34, to position each riser-section 14 in
a support position of the riser support assembly 34, and in one
position of each riser-section 14. It should be noted that each
support arm assembly 70 could, in one form, include additional
locating pins 88; however, in a preferred form, each support arm
assembly 70 does include at least one locating pin 88, and each
support arm assembly 70 is disposed generally on opposite sides of
the riser-section 14 being supported thereby such that the locating
pins 88 on the support arm assemblies 70 are spaced approximately
180.degree. apart, in a support position of the riser support
assembly 34, as shown in FIGS. 1, 2 and 3.
As shown more clearly in FIG. 3, the support ring 60 of each
riser-section 14 has an upper surface 90 and a lower surface 92.
The lower surface 92 of each support ring 60 is shaped to engage a
portion of the upper surface 86 of each support arm 74, in a
support position of one of the riser-sections 14 with respect to
the riser support assembly 34, as shown in FIGS. 1, 2 and 3.
Each actuator assembly 72, more particularly, includes a cylinder
actuator 93, having a piston arm 94 reciprocatingly disposed
therein. The end of each cylinder actuator 93, opposite the piston
arm 94 end thereof, is pivotally secured to a flange 95, which is
secured to a portion of the base plate 40 via a pivot pin 96 (the
pivotal interconnection between one of the cylinder actuators 93
and one of the flanges 95 being shown in greater detail in FIG. 3).
The end of each piston arm 94 opposite the end thereof
reciprocatingly disposed in one of the cylinder actuators 93 is
pivotally secured to a flange 97, formed on a portion of each
support arm 74 and extending generally perpendicularly
therefrom.
The support arms 74 and the cooperating cylinder actuators 93 are
thus each pivotally connected to the support member 16 or, more
particularly, to a portion of the base plate 40, and interconnected
such that as each piston arm 94 is reciprocated into the respective
cylinder actuator 93, each support arm 74 is pivotally moved in a
general direction 98 to a release position, and such that as each
piston arm 94 is reciprocated generally toward the support arm 74
connected thereto, each support arm 74 is pivotally moved in a
general direction 99 to a support position. Each cylinder actuator
93 is thus actuatable to move the support arm 74 connected thereto
to a support position and a release position, in a manner as
generally described above. Such cylinder actuators are well known
in the art, and a further detailed description of the construction
and operation thereof is not required herein.
In the support position of the riser support assembly 34 and one of
the riser-sections 14, the locating pin 88 of each support arm 74
is disposed through one of the position apertures 62. In this
position, the locating pins 88 of each support arm 74 thus
cooperate with the support ring 60 of the supported riser-section
14 to securedly position the supported riser-section 14 in the
riser support assembly 34. Thus, the base 84 securedly supports the
riser-section 14 in the riser support assembly 34 in a stationary
vertical position, and the locating pins 88 cooperate with the
position apertures 64 to securedly support the riser-sections 14 in
the riser support assembly 34 in a stationary axial position, in
the support position of the riser support assembly 34.
It should be particularly noted that the term vertical as used
herein to denote a direction or a plane represents a direction or a
plane which extends generally parallel to a direction of plane
extending perpendicularly from the base plate 40, and the term
horizontal as used herein to denote a direction or a plane
represents a direction or plane which extends generally parallel to
the base plate 40. In this regard, the terms axially and radially
are used herein to denote a direction or a plane extending
generally axially or radially with respect to the constructed riser
12 which is vertically disposed in the body of water 22.
The riser lowering assembly 36 is constructed and positioned to
guidingly lower the constructed riser 12 in a direction generally
toward the underwater pipeline 18 to a position wherein the riser
12 connectingly engages the underwater pipeline 18. As shown in
FIGS. 1 and 2, the riser lowering assembly 36 includes a pair of
winch assemblies 100, each winch assembly 100 being supported on
the support member 16 and spaced approximately 180.degree. apart.
More particularly, one of the winch assemblies 100 is supported on
the base plate 40 generally near the end 46 thereof, and one of the
winch assemblies 100 is supported on the base plate 40 generally
near the end 48 thereof. A winch cable 102 is connected to each
winch assembly 100.
As shown in FIG. 2, a pair of winch apertures 104 are formed
through the base plate 40. More particularly, each winch aperture
104 is formed through the base plate 40 generally between one of
the winch assemblies 100, and the riser aperture 66, for reasons
which will be made more apparent below.
One end of each wench cable 102 is secured to one of the winch
assemblies 100 and the opposite end of each winch cable 102 is
removably connected to a portion of the interconnected
riser-sections 14, more particularly, a connecting end 106 of each
winch cable 102 is removably connected to the support ring 60 of
one of the riser-sections 14 via the support apertures 64
therethrough. Each winch cable 102 is disposed through one of the
winch apertures 104, and is disposed in guiding engagement with a
guide pulley 106. Each guide pulley 108 is secured to a portion of
the platform 16, and is disposed thereon to guide one of the winch
cables 102 into a guidingly, engaging position with the constructed
riser 12, for reasons which will be described in detail below.
Each winch assembly 100 has an actuated raising and an actuated
lowering position, and is constructed such that in the actuated
raising position, each winch assembly 100 retrieves a portion of
the winch cable 102 connected thereto, thereby raising the
constructed riser 12 connected thereto, and such that in the
actuated lowering position, each winch 100 releases a predetermined
length of the winch cable 102, thereby lowering the constructed
riser 12 connected thereto. Winch assemblies constructed to
retrieve and release a winch cable connected thereto, such as
generally described above with respect to the winch assemblies 100,
are well known in the art and a detailed description of the
construction and operation of the various components thereof is not
required herein.
As shown in FIGS. 1 and 2, the positioning assembly 38 includes an
overhead crane assembly 110 which is rollingly connected to a
transverse track assembly 112. The transverse track assembly 112 is
rollingly connected to a lateral track assembly 113. The track
assemblies 112 and 113 are each supported in a horizontal plane
generally above the riser support assembly 34 and the stored
riser-sections 14, which are storingly disposed in the support
apertures 54. More particularly, the lateral track assembly 113
includes a pair of lateral track members 114 which extend generally
laterally over the riser support assembly 34 and the stored
riser-sections 14, and the transverse track assembly 112 includes a
pair of transverse track members 115 which extend generally
transversely with respect to the lateral track assembly 113.
The overhead crane assembly 110 includes a crane support frame 116
which is rollingly connected to the transverse track assembly 112
via a plurality of interconnecting roller assemblies 118, as shown
more clearly in FIG. 2. The crane support frame 116 is thus
transversely positionable on the transverse track assembly 112 or,
more particularly, rollable on the transverse track assembly 112 to
predetermined positions over the stored riser-sections 14 and over
the riser support assembly 34.
As shown in FIGS. 1 and 2, the overhead crane assembly 110 also
includes a crane winch 120 which is supported on a portion of the
crane support frame 116, and a crane cable 122 having one end
thereof connected to the crane winch 120. A riser section connector
124 is secured on the end of the crane cable 122, opposite the end
thereof connected to the crane winch 120.
The transverse track assembly 112 is, more particularly, rollingly
connected to the lateral track assembly 113 via a plurality of
roller assemblies 119, as shown more clearly in FIG. 2. The
transverse track assembly 112 is thus laterally positionable on the
lateral track assembly 113.
It is apparent from the foregoing, that the crane assembly 110 is
positionable on the track assemblies 112 and 113 to predetermined
positions over the stored riser-sections 14 and over the riser
support assembly 34, during the operation of the positioning
assembly 38. In one form, a position control apparatus (not shown)
is connected to the overhead crane assembly 110 and a control
portion thereof is disposed near the base plate 40 so that an
operator can transversely and laterally position the overhead crane
assembly 110, for reasons and in a manner to be made more apparent
below.
The riser section connector 124 is constructed to be removably
secured to a portion of a riser-section 14. In a preferred form,
the riser section connector 124 is, more particularly, constructed
to be securedly and removably connected to the support ring 60 of
one of the riser-sections 14 via the support apertures 64
therethrough, in an operating position of the riser section
connector 124, so that the riser-section 14 connected thereto can
be positioningly raised and lowered by the positioning assembly 38,
in a manner and for reasons to be described in detail below.
The crane winch 120 is driven by a winch drive 126 which, as shown
in FIG. 1, is also supported on a portion of the crane support
frame 116. The winch drive 126 has an actuated raising position and
an actuated lowering position, and is connected to the crane winch
120 such that, in an actuated raising position of the winch drive
126, the crane winch 120 retrieves a portion of the crane cable 122
thereby raising the riser-section 14 connected thereto via the
riser section connector 124 in a generally vertical direction
toward the track assemblies 112 and 113, and such that, in an
actuated lowering position of the winch drive 126, the crane winch
120 releases a portion of the crane cable 122 thereby lowering the
riser-section 14 connected thereto via the riser section connector
124 in a generally downwardly direction toward the stored
riser-sections 14 and the riser support assembly 34. In a preferred
form, the control apparatus (not shown) for the winch drive 126 is
connected to the winch drive 126 and movably disposed near the base
plate 40 so that an operator can control the actuated position of
the winch drive 126 to raise or lower a riser-section 14, in a
manner and for reasons to be made more apparent below.
In one form, and as shown in FIGS. 1 and 2, the riser construction
apparatus 10 also includes a riser section receiving assembly 130
which is supported on the support member 16. The riser section
receiving assembly 130, as shown more clearly in FIG. 2, basically
includes a pair of support beams 132, one end of each support beam
132 being secured to the end 46 of the support frame 42. The
support beams 132 are spaced a distance apart, and each support
beam 132 extends a distance generally perpendicularly from the
support frame 42. More particularly, the support members 132 are
spaced a sufficient distance apart and disposed with respect to the
platform 16 to receivingly and supportingly engage a portion of the
lower surface 92 of the support ring 60 of one of the
riser-sections 14, which is supportingly positioned therein from a
barge type support member for temporary storage, for reasons to be
made more apparent below.
The underwater pipeline 18 is constructed of a plurality of
interconnected pipe-sections and, in a preferred form and as shown
in FIG. 1, an underwater connecting end 140 is connected to one end
of the underwater pipeline 18. The underwater connecting end 140,
referred to sometimes below as the pipeline underwater connecting
end 140, is constructed to interconnectingly engage one end of the
constructed riser 12, in one position of the constructed riser 12
and the underwater pipeline 18, as will be described in greater
detail below.
A guide coupling assembly 142 is removably disposed in a portion of
the underwater pipeline 18 generally near the end of the underwater
pipeline 18 having the underwater connecting end 140 connected
thereto, as shown in FIG. 1. A portion of the guide coupling
assembly 142 is shaped and disposed to guidingly engage a portion
of the constructed riser 12, generally near an underwater
connecting end 144 thereof, to guide the constructed riser 12 to a
position wherein the underwater connecting end 144 of the
constructed riser 12 connectingly engages a portion of the
underwater connecting end 140 of the underwater pipeline 18, in a
manner to be described in greater detail below.
As mentioned before, each of the riser-sections 14 has a connecting
upper end 56 and a connecting lower end 58; however, in a preferred
form and as shown in FIG. 1, one of the riser-sections 14 has an
upper end 56 and the underwater connecting end 144 is connected to
the end thereof opposite the upper end 56 thereof. The
riser-sections 14 are interconnected to form the constructed riser
12 such that the underwater connecting end 144 connected to the one
riser-section 14 forms the lowermost end or the underwater
connecting end 144 of the constructed riser 12. It is apparent from
the foregoing that the constructed riser 12 is formed from a
predetermined number of riser-sections 14 wherein one of the
riser-sections 14 has an upper end 56 and an underwater connecting
end 144, and each other riser-section 14 has an upper end 56 and a
lower end 58. The riser-sections 14 are interconnected such that
the connecting upper end 56 of some of the riser-sections 14 is
interconnected to the connecting lower end 58 of one other
riser-section 14 to form the constructed riser 12, as will be made
more apparent below.
As shown in FIG. 1, the riser construction apparatus 10 also
includes a flange alignment assembly 146 which is supported
generally between the underwater connecting end 144 of the one
riser-section 14 and the underwater connecting end 140 connected to
the underwater pipeline 18. The flange alignment assembly 146 is
constructed to align the bolt holes (not shown in FIG. 1) of the
underwater connecting end 140 connected to the underwater pipeline
18 with the bolt holes through a portion of the underwater
connecting end 144 of the one riser-section 14 for bolting
interconnection therebetween, in a manner and for reasons which
will be described in greater detail below.
OPERATION OF FIGURES 1, 2 AND 3
The riser construction apparatus 10 described above, is constructed
and positioned to facilitate the construction of the riser 12 from
the support member 16, and to position the lowermost end of the
constructed riser 12, that is the underwater connecting end 144
thereof, in an interconnectingly engaging position with the
underwater connecting end 140 of the underwater pipeline 18, so
that the constructed riser 12 can be safely and securedly joined to
the underwater pipeline 18.
After the platform 16 has been constructed, the support frame 42,
having the base plate 40 secured thereto is initially positioned
upon and secured to a portion of the first operating deck 30 of the
platform 16. In one form, the various assemblies and components of
the riser construction apparatus 10 are then secured in an
assembled position to the base plate 40 and to a portion of the
second operating deck 32. In another form, the various assemblies
and components of the riser construction apparatus 10 could be
secured to the first operating deck 30, the first operating deck
30, in this form, providing the support structure for the riser
construction apparatus 10.
A plurality of riser-sections 14 are then storingly disposed in the
support apertures 54 for subsequent utilization in the construction
of the riser 12. It should be noted that, in one form, the riser
construction apparatus 10 could be assembled on the base plate 40
prior to inserting the support frame 42 onto the support member 16.
In this form, if the riser-sections 14 are storingly disposed in
the support apertures 54 prior to inserting the unit onto the
platform 16, the first operating deck 30 will be constructed or
modified to provide an access opening or a clearance for the stored
riser-sections 14 to pass through, as the unit is being initially
positioned onto the first operating deck 30.
In those applications where the riser-sections 14 are not initially
positioned in the various support apertures 54 prior to installing
the riser construction apparatus 10 on the platform 16, the
riser-sections 14 to be storingly supported through the
riser-section apertures 54 are initially unloaded from a barge,
temporarily positioned in the riser section receiving assembly 130,
and then positioned in the support apertures 54 by the positioning
assembly 38. In this instance, the positioning assembly 38 is
positioned generally over the riser-section 14 temporarily stored
in the riser section receiving assembly 130, and actuated to a
lowering position, thereby lowering the crane cable 122. The crane
cable 122 is lowered to a position wherein the riser section
connector 124 can be securedly connected to the riser-section 14
stored in the riser section receiving assembly 130. The positioning
assembly 38 is then actuated to a raising position, thereby raising
the crane cable 122 and the riser-section 14 connected thereto via
the riser-section connector 124. The positioning assembly 38 will
raise the riser-section 14 to a position wherein the connecting
lower end 58 of the riser-section 14 is disposed in a horizontal
plane generally above the base plate 40. The positioning assembly
38 is then moved transversely and laterally over the base plate 40
to a position wherein the riser-section 14 connected thereto is
spaced generally over one of the support apertures 54. The
positioning assembly 38 is then again actuated to a lowering
position, thereby lowering the riser-section 14 connected thereto
through the support aperture 54 and to a position wherein the
riser-section 14 is storingly supported therein, in a manner as
described before.
The positioning assembly 38 is utilized, in a manner as described
above, to remove a predetermined number of riser-sections 14 from
the riser section receiving assembly 130 and to position those
riser-sections 14 in a stored position through the support
apertures 54. It should also be noted that, in those applications
where the riser-sections 14 are storingly disposed in the support
apertures 54 prior to inserting the riser construction apparatus 10
onto the platform 16, the riser section receiving assembly 130 and
the positioning assembly 38 can be utilized to obtain additional
riser-sections 14 which may be required during the construction of
the riser 12, in some of the applications, in a manner similar to
that described above.
Whether the riser section receiving assembly 130 and the
positioning assembly 38 are utilized to initially position the
riser-sections 14 in the support apertures 54, or to position
additional riser-sections 14 in the support apertures 54, in either
event, the riser-sections 14 can be initially positioned in the
riser section receiving assembly 130 and subsequently positioned in
the support apertures 54 by the positioning assembly 130 during a
slack tide. In this manner, the stored riser-sections 14 can be
subsequently utilized to construct the riser 12 regardless of the
water condition, and thus various operating personnel and equipment
are not idled due to a rough water condition, thereby reducing the
amount of non-productive time and substantially increasing the
efficiency and reducing the cost of the riser construction
operation.
After the riser construction apparatus 10 has been securedly
positioned on the platform 16 and the riser-sections 14 have been
storingly disposed through the support apertures 54, the riser
support assembly 34 is then actuated to a support position, that is
a position wherein the riser support assembly 34 is positioned to
securedly and supportingly receive and engage a riser-section 14.
More particularly, each actuator assembly 72, shown more clearly in
FIG. 3, is actuated to pivotally move each support arm assembly 70
in a support direction 99.
The positioning assembly 38 and, more particularly, the overhead
crane assembly 110 supported thereon, is then transversely and
laterally positioned on the transverse track assembly 112 and the
lateral track assembly 113, respectively, such that the overhead
crane assembly 110 is positioned generally over or above one of the
riser-sections 14 which is storingly disposed in one of the support
apertures 54 or in the riser section receiving assembly 130. In
this position of the positioning assembly 38, the winch drive 126
is then actuated to a lowering position, thereby lowering the crane
cable 122 in a downwardly direction generally toward the base plate
40. The crane cable 122 is lowered, in a manner as described above,
to a position wherein the riser section connector 124 is disposed
generally near the connecting upper end 56 of one of the
riser-sections 14. The operator will then secure the riser section
connector 124 to the riser-section 14 or, more particularly, to the
support ring 60 of the riser-section 14.
After the riser section connector 124 is secured to one of the
riser-sections 14, the winch drive 126 is then actuated to a
raising position wherein the crane cable 122 is retrieved on the
crane winch 120 or, in other words, wherein the crane cable 122 is
moved in an upwardly direction generally toward the positioning
assembly 38, thereby raising the riser-section 14 connected thereto
via the riser section connector 124. The overhead crane assembly
110 will continue to move the riser-section 14 connected thereto in
an upwardly direction to a position wherein the connecting lower
end 58 of the riser-section 14 is disposed a distance vertically
above the base plate 40 and thus removed from the support apertures
54.
The operator will then move the overhead crane assembly 110
transversely across the transverse track assembly 112 and move the
transverse track assembly 112 laterally across the lateral track
assembly 113 to a position wherein the riser-section 14 connected
thereto is disposed generally above the riser support assembly 34
or, more particularly, generally above the riser opening 66 through
the base plate 40. The overhead crane assembly 110, or more
particularly, the winch drive 126 thereof is then actuated to a
lowering position, thereby lowering the riser-section 14 connected
thereto in a generally downwardly direction toward the base plate
40.
The riser-section 14 is lowered by the overhead crane assembly 110,
as described above, through the space between the support arm
assemblies 70 and through the riser opening 66 to a position
wherein the lower surface 92 of the support ring 60 is supportingly
engaged by the upper surface 86 of each support arm assembly 70. In
a preferred form, the riser-section 14 being lowered through the
riser opening 66 is also positioned such that each locating pin 88,
disposed on the support arms 74, is partially disposed through one
of the position apertures 62 in the support ring 60, as shown more
clearly in FIG. 3.
The supported riser-section 14, that is the particular
riser-section 14 supported in the riser support assembly 34, is
thus secured in a predetermined horizontal plane via the engagement
between a portion of the lower surface 92 of the support ring 60
and the supporting surface 86 of each support arm 74. The supported
riser-section 14 is also securedly supported in a predetermined
axial position via the locating pins 88, each of which is disposed
through one of the position apertures 62 in the support ring 60.
The locating pins 88, more particularly, engage a portion of the
support ring 60 and cooperate to limit or virtually prevent any
rotational movement of the supported riser-section 14, about an
axial axis, for reasons which will be made more apparent below.
It should be noted that, in a preferred form, the first
riser-section 14 supported in the riser support assembly 34 is,
more particularly, that one riser-section 14 having the underwater
connecting end 144 connected thereto. It will be apparent from the
foregoing that, in this manner, the lowermost end of the
constructed riser 12, as shown in FIG. 1, will be the underwater
connecting end 144.
After one of the riser-sections 14 has been securedly supported in
the riser support assembly 34, the operator will then release and
remove the riser section connector 124 from the support ring 60 of
the supported riser-section 14, thereby disconnecting the supported
riser-section 14 from the positioning assembly 38. The winch drive
126 of the positioning assembly 38 is then actuated to a raising
position, and the overhead crane assembly 110 is then moved
laterally and transversely on the track assemblies 112 and 113 to a
position wherein the overhead crane assembly 110 is disposed
generally above another or a subsequent riser-section 14. The winch
drive 126 is then actuated to a lowering position, thereby lowering
the riser section connector 124 to a position for interconnection
thereof to the subsequent riser-section 14.
After the riser section connector 124 is secured to the support
ring 60 of the riser-section 14, the winch drive 126 is then
actuated to a raising position, thereby raising the riser-section
14 connected thereto. The riser-section 14 is raised in a generally
upwardly direction and removed from the support aperture 54. The
overhead crane assembly 110 is then laterally and transversely
positioned over the base plate 40 to a position wherein the
riser-section 14 connected thereto is disposed generally over the
riser support assembly 34, in a manner as described above.
After the subsequent riser-section 14 has been positioned over the
riser support assembly 34, as described above, the overhead crane
assembly 110 is actuated to a lowering position, thereby lowering
the riser-section 14 connected thereto generally toward the riser
support assembly 34 or, more particularly, generally toward the
supported riser-section 14 which is securedly supported in the
riser support assembly 34. The riser-section 14 supported by the
positioning assembly 38 is lowered to a position wherein the
connecting lower end 58 thereof is positioned in a mating,
interconnecting relationship with respect to the connecting upper
end 56 of the riser-section 14, which is supported in the riser
support assembly 34.
After the connecting lower end 58 of the riser-section 14 supported
by the positioning assembly 38 is then moved into a mating,
interconnecting relationship with respect to the connecting upper
end 56 of the riser-section 14 supported in the riser support
assembly 34, the two riser-sections 14 are then secured together
such as, for example, by welding or bolting two riser-sections 14
together. It should be noted that, in the preferred form, the two
riser-sections 14 are welded or, at least, partially welded in an
interconnecting relationship to form a portion of the constructed
riser 12. In this form of the invention, that is where the two
riser-sections 14 are welded or partially welded in an
interconnecting relationship, the connecting upper end 56 and the
connecting lower end 58 of each riser-section 14 is formed and
constructed to facilitate not only the interconnecting, mating
relationship, described above, but also to facilitate the welding
interconnection of the two riser-sections 14. It should also be
noted that preferred embodiments of the connecting upper end 56 and
the connecting lower end 58 of the riser-sections 14 will be
described in greater detail below.
The riser support assembly 34 maintains the riser-section 14,
supported therein, in a firm and secure position, such that the
movement of the supported riser-section 14 is substantially reduced
or virtually eliminated, as described before. The positioning
assembly 38 cooperates to maintain the position of the
riser-section 14 connected thereto in a manner relatively free of
movement, and connecting upper end 56 and connecting lower end 58
of each riser-section 14 is also shaped in a preferred form, to
cooperate with the riser support assembly 34 and the positioning
assembly 38 to maintain the interconnecting disposition of the
riser-sections 14 during the welding or other interconnecting
operation to assure a sealingly secure interconnection between the
two riser-sections.
After the two riser-sections 14 have been secured in an
interconnected relationship, as described above, the winch drive
126 of the positioning assembly 38 is actuated to a raising
position, thereby raising the two interconnected riser-sections 14
in a generally upwardly, vertical direction. The two interconnected
riser-sections 14 are raised upwardly by the positioning assembly
38 to a position wherein the riser support assembly 34 is
disengaged from the supported riser-section 14 supported thereby
or, more particularly, to a position wherein the locating pins 88
of the riser support assembly 34 are removed from the position
apertures 62 of the supported riser-section 14.
After the two interconnected riser-sections 14 have been raised by
the positioning assembly 38, as described above, each connecting
end portion 106 of the riser lowering assembly 36 is removably,
securedly connected through one of the support apertures 64 of the
support ring 60 of the riser-section 14 first supported in the
riser support assembly 34. The riser lowering assembly 36 is thus
connected in an assembled position to a portion of the partially
constructed riser 12, in a manner as described above.
The riser lowering assembly 36 is constructed and the guide pulleys
108 are disposed and positioned on the support member 16 to
maintain each winch cable 102 taut at all times during the
construction of the riser 12, after the riser lowering assembly 36
has been connected to the first supported riser-section 14 and,
more particularly, is constructed to lower the interconnected
riser-sections 14 of the constructed riser 12 to a position wherein
the underwater connecting end 144 of the constructed riser 12 is
interconnectingly disposed with respect to the underwater
connecting end 140 of the underwater pipeline 18, as will be
described in greater detail below.
After the interconnected riser-sections 14 have been disengaged
from the riser support assembly 34, as described above, the riser
support assembly 34 is actuated to a release position, that is a
position wherein each support arm 74 is pivoted in a release
direction 98 away from the riser opening 66. The support arm
assemblies 70 and the actuator assemblies 72 are each constructed
such that, in the release position of the riser support assembly
34, each support arm 74 is pivoted in a release direction 98 to a
position wherein the interconnected riser-sections 14 can be
lowered through the riser support assembly 34 and through the riser
opening 66 without engaging either support arm assembly 70.
After the riser support assembly 34 has been positioned in the
release position, the overhead crane assembly 110 is actuated to a
lowering position, thereby lowering the two interconnected
riser-sections 14 through the riser support assembly 34 through the
riser opening 66, to a position wherein the connecting upper end 56
of the last connected riser-section 14 is disposed in a horizontal
plane generally above the riser support assembly 34. The riser
support assembly 34 is then actuated to a support position, as
described before, and the interconnected riser-sections 14 are
further lowered to a position wherein the connecting upper end
portion 56 of the last connected riser-section 14 is securedly and
supportingly engaged by the riser support assembly 34, in a manner
similar to that described in detail before with respect to the
riser-section 14 first supportingly positioned in the riser support
assembly 34.
The riser-section connector 124 is then disconnected from the
riser-section 14, and the two interconnected riser-sections 14 are
then securedly supported and positioned in a predetermined
horizontal plane by the riser support assembly 34, in a manner
similar to that described before. The positioning assembly 38 is
then utilized to remove another riser-section 14 storingly disposed
in one of the support apertures 54, and to move that riser-section
14 to a position wherein the connecting lower end 58 of that
riser-section 14 is matingly and interconnectingly disposed with
respect to the connecting upper end 56 of the riser-section 14
supported in the riser support assembly 34, in a manner similar to
that described above. The connecting lower end 58 of the
riser-section 14 supported by the positioning assembly 38 is then
secured to the connecting upper end 56 of the riser-section 14
supported in the riser support assembly 34, in a manner similar to
that described above. The positioning assembly 38 is actuated to
disengage the supported riser-sections 14 from the riser support
assembly 34, and to lower the interconnected riser-sections 14
through the riser support assembly 34 and through the riser opening
66 to a position wherein the connecting upper end 56 of the last
connected riser-section 14 is securedly and supportingly engaged by
the riser support assembly 34.
A predetermined number of riser-sections 14 are interconnected in a
manner as described above to form the constructed riser 12. The
precise number of riser-sections 14 utilized to form the
constructed riser 12 will, of course, depend upon the desired
overall length of the riser 12 and the length of each riser-section
14.
After the riser-sections 14 have been securedly interconnected to
form the constructed riser 12, the riser lowering assembly 36 is
actuated to a raising position, thereby raising the constructed
riser 12 to a position wherein the last connected riser-section 14
is disengaged from the riser support assembly 34. The riser support
assembly 34 is then actuated to a release position.
In a release position of the riser support assembly 34, the riser
lowering assembly 36 is actuated to a lowering position thereby
lowering the constructed riser 12 in a generally downwardly
direction toward the underwater connecting end 140 connected to the
underwater pipeline 18. The riser lowering assembly 36 is, more
particularly, utilized to lower the constructed riser 12 to a
position wherein the underwater connecting end 144 thereof is
positioned in mating and interconnecting engagement with the
underwater connecting end 140 of the underwater pipeline 18, as
will be described in greater detail below.
In one form, the riser lowering assembly 36 can be utilized solely
to lower the constructed riser 12, and the positioning assembly 38
can be utilized to provide a stationary, augmenting support for the
interconnected riser-sections 14 during the lowering thereof. In
another form, the riser lowering assembly 36 and, more
particularly, the winch cables 102 thereof can be utilized solely
to lower the constructed riser 12.
In a preferred form, and as will be described in greater detail
below, the guide coupling assembly 142 and the flange alignment
assembly 146 are each disposed in a portion of the underwater
pipeline 18 generally near the underwater connecting end 140
thereof. The guide coupling assembly 142 and the flange alignment
assembly 146 each cooperate to position the underwater connecting
end 144 of the constructed riser 12 in an interconnecting
relationship with respect to the underwater connecting end 140 of
the underwater pipeline 18. More particularly, the guide coupling
assembly 142 guidingly engages the underwater connecting end 144 of
the constructed riser 12 to guide the underwater connecting end 144
in an interconnecting relationship with respect to the underwater
connecting end 140 of the underwater pipeline 18, as the
constructed riser 12 is lowered in a generally downwardly direction
toward the underwater connecting end 140 of the underwater pipeline
18. The flange alignment assembly 146, more particularly,
cooperates to align the bolt holes of the underwater connecting end
144 with the bolt holes of the underwater connecting end 140 for
bolting interconnection therebetween in a manner which will be
described in more detail below.
The riser lowering assembly 36 will be actuated to initially lower
the constructed riser 12 to a position wherein the underwater
connecting end 144 thereof is disposed in a horizontal plane
generally above the underwater connecting end 140 of the underwater
pipeline 18. The riser lowering assembly 36 is then utilized to
maintain the constructed riser 12 in a predetermined horizontal
plane until such time as the underwater interconnection between the
constructed riser 12 and the underwater pipeline 18 can be effected
by a diver. The diver will position himself generally near the
underwater connecting ends 140 and 144 of the pipeline 18 and the
constructed riser 12, respectively, and then, in a preferred form,
the riser lowering assembly 36 will be actuated to further lower
the constructed riser 12 to a position wherein the underwater
connecting end 144 of the riser 12 interconnectingly and matingly
joins the underwater connecting end 140 of the underwater pipeline
18. The diver will then secure the constructed riser 12 to the
underwater pipeline 18 such as, for example, by bolting or by
bolting and welding the underwater connecting end 144 of the riser
12 to the underwater connecting end 140 of the underwater pipeline
18.
It will be apparent from the foregoing, that the riser construction
apparatus 10, shown in fIGS. 1, 2 and 3 and described above, thus
provides an apparatus and a method for constructing an underwater
riser in a safe and efficient manner, and a manner assuring a
sealingly secure interconnection between the various riser-sections
14 and between the underwater interconnecting ends of the riser and
the underwater pipeline. The two riser-sections 14 which are being
interconnected during any one portion of the operation of the riser
construction apparatus 10 are securedly positioned in an
interconnecting relationship by the riser support assembly 34 and
the riser positioning assembly 38, thereby substantially reducing
or virtually eliminating relative movement between the two
riser-sections 14 being thus interconnected. In those instances
where the interconnection between the two riser-sections must be
effected while relative movement between the two riser-sections is
occurring, as in the past, the interconnecting weld material or the
seal element disposed between the end of the two riser-sections
being interconnected will be continually fractured, cracked or
damaged, thus making it virtually impossible to assure a sealingly
secure interconnection.
The riser construction apparatus 10 is particularly adapted to be
supported by a marine support structure 16, such as the platform
16, shown in FIGS. 1, 2 and 3, thereby permitting the various
technical personnel responsible for the construction of the riser
12 to perform their various responsibilities and functions from a
stable supporting structure, and further since the relative
movement between the two riser-sections 14 being interconnected is
virtually eliminated, their various functions and responsibilities
can be effected under safer, overall working conditions. It should
also be noted that since the two riser-sections 14 are securedly
positioned and supported in a mating and interconnected
relationship during the interconnecting operation, in a manner as
described above, the various riser-sections 14 can be
interconnected to form the constructed riser 12 independent of the
particular condition of the body of water 22 into which the
constructed riser 12 will ultimately be disposed. More
particularly, the interconnection between the various
riser-sections 14 can be effected utilizing the riser construction
apparatus 10 even during those times when a high tide or a rough
water condition exists with respect to the body of water 22
generally about or near the marine support structure 16, thereby
effecting the construction of the riser 12 in a more efficient
manner.
As shown in FIGS. 1 and 2 and as described in detail before, a
plurality of riser-sections 14 are storingly disposed through a
portion of the riser construction apparatus 10 to be subsequently
utilized during the construction of the underwater riser 12. The
riser-section receiving assembly 130 allows a plurality of
additional riser-sections 14 to be unloaded from a barge and
storingly disposed in the riser construction apparatus 10 during
slack tide water conditions, thereby permitting an overall more
efficient riser construction operation. More particularly,
utilizing the riser construction apparatus 10, the various
technical and operating personnel associated with the construction
of the riser 12 are not idled during rough water conditions.
EMBODIMENT OF FIGURE 4
The riser construction apparatus 10a, shown in FIG. 4, is
constructed similar to the riser construction apparatus 10, shown
in FIGS. 1, 2 and 3, the salient difference being that the support
frame 42 is rigidly and adjustably connected to the transverse
track assembly 112 and the lateral track assembly 113 by a
plurality of telescoping connectors 150. The riser construction
apparatus 10a is thus constructed such that the support frame 42
provides a portable supporting structure for the riser support
assembly 34, the riser lowering assembly 36, the positioning
assembly 38 and the riser section receiving assembly 130, such that
the riser construction apparatus 10a can be constructed as a
complete, single, unitary unit, and subsequently transported to the
various offshore locations, and inserted as a unit onto the support
structure, such as the platform 16 shown in FIGS. 1 and 2.
Each telescoping connector 150 has opposite ends, and one end of
each telescoping connector 150 is connected to a portion of the
base plate 40. The positioning assembly 38 is supportingly
connected to the end of each telescoping connector 150, opposite
the ends thereof secured to the base plate 40. Each telescoping
connector 150 is positionable in predetermined horizontal planes to
position the positioning assembly 38 in a transport position and an
assembled position.
More particularly, each telescoping connector 150 (two of the
telescoping connectors 150 are shown in FIG. 4), basically includes
a first structural support member 152, which is secured on one end
thereof to a portion of the lateral track assembly 113, and a
second structural member 154, which is secured on one end thereof
to the support frame 42. Each second structural member 154 is
hollow, and the hollow portion thereof is sized to telescopingly
receive a portion of one of the first structural members 152. It
will be apparent to those skilled in the art from the foregoing,
that the vertical distance generally between the base plate 40 and
the transverse track assembly 112 and the lateral track assembly
113 is thus adjustable in a vertically, downwardly direction 158
and in a vertically, upwardly direction 160 by moving the
positioning assembly 38 in a vertically downwardly direction 158 or
in a vertically upwardly direction 160, respectively, thereby
telescoping each first structural member 152 a greater distance
into the hollow portion of one of the second structural members 154
or telescoping each first structural member 152 in a direction
generally out of the hollow portion of one of the second structural
members 154. It should be noted that although only two of the
telescoping connectors 150 are shown in FIG. 2, that in a preferred
form, a plurality of telescoping connectors 150 are connected to
the base plate 40 and positioned thereon generally about the
support frame 42 such as, for example, positioning one telescoping
connector 150 at each corner of the support frame 42, in such a
manner that the transverse track assembly 112 and the lateral track
assembly 113 is securedly positioned in a horizontal plane
generally above the base plate 40 via the telescoping connectors
150.
In one form, after the first structural member 152 of each
telescoping connector 150 has been telescopingly disposed to a
predetermined position in the hollow portion of one of the second
structural members 154, the first structural member 152 and the
second structural member 154 of each telescoping connector 150 can
be secured in this predetermined position by welding
interconnection therebetween. In a preferred form, and as indicated
in FIG. 4, a plurality of apertures 156 are formed through a
portion of each of the second structural members 154 and a
plurality of holes, similar to the holes 156, are also formed
through a portion of each of the first structural members 152. In
this latter form, after the positioning assembly 38 has been moved
to a predetermined horizontal position above the base plate 40, a
securing pin (not shown) can then be disposed through one of the
apertures 156 and through an aligned aperture in the first
structural member 152 of each telescoping connector 150, the pin
thereby removably securing the first structural member 152 in a
predetermined position with respect to the second structural member
154 of each telescoping connector 150.
OPERATION OF FIG. 4
As mentioned before, the riser construction apparatus 10a, shown in
FIG. 4, is particularly constructed to provide portable support for
the various components and assemblies of the riser construction
apparatus 10a, so that the riser construction apparatus 10a can be
conveniently transported to a remote location and disposed in an
assembled position on a particular marine support structure, such
as the first operating deck 30 of the platform 16, shown in FIGS. 1
and 2. The riser construction apparatus 10a is positionable in a
transport position, that is a position wherein the first structural
member 152 has been telescoped in a vertically, downwardly
direction 158 to the full extent, or more particularly, to the
position wherein the end of each first structural member 152 either
abuts the end of one of the second structural members 154 connected
to the support frame 42 or to a position wherein a portion of the
positioning assembly 38 engages a portion of the end of each second
structural member 154 opposite the ends thereof secured to the
support frame 42.
After positioning the riser construction apparatus 10a in a
transport position, as described above, the riser construction
apparatus 10a is then transported to a predetermined remote
location for installation on a particular marine support structure.
The riser construction apparatus 10a is then disposed in an
operating position on the marine support structure and the support
frame 42 is secured and positioned thereto such as by bolting or
welding.
After the support frame 42 has been securedly positioned on the
particular marine support structure, the positioning assembly 38 is
then raised in a vertically, upwardly direction 160 to an assembled
position wherein the positioning assembly 38 is disposed in a
predetermined horizontal plane above the base plate 40 of the
support frame 42. In an assembled position of the positioning
assembly 38, the first structural member 152 and the second
structural member 154 of each telescoping connector 150 are then
interconnected such as, for example, by welding or by utilizing a
pin disposed through one of the apertures 156, in a manner as
described above.
It will be apparent to those skilled in the art that after the
riser construction apparatus 10a has been inserted and secured in
an operating position on the particular marine support structure,
that the riser construction apparatus 10a will then be utilized to
construct the riser 12 and to guidingly position the underwater
connecting end 144 thereof in an interconnecting relationship with
respect to the underwater connecting end 140 of the underwater
pipeline 18, in a manner as described before with respect to FIGS.
1, 2 and 3. The riser construction apparatus 10a thus retains all
of the advantages of the riser construction apparatus 10, and in
addition provides a portable structure which can be transported to
various locations in an assembled position.
EMBODIMENT OF FIGS. 5 AND 6
One preferred embodiment of each riser-section 14 having the
connecting upper end 56 and the connecting lower end 58 is shown in
detail in FIGS. 5 and 6. More particularly, the connecting upper
end 56 of a riser-section 14 is shown in FIGS. 5 and 6 in an
interconnected relationship with respect to the connected lower end
58 of another riser-section 14. The two riser-sections 14, shown in
FIGS. 5 and 6, have been sealingly secured in an interconnecting
relationship by welding a portion of the connecting upper end 56 of
one of the riser-sections 14 to a portion of the connected lower
end 58 of the other riser-section 14.
Although, the following description will relate particularly to the
two riser-sections 14, as shown in FIGS. 5 and 6, it is
contemplated in this embodiment of the invention that each of the
riser-sections 14 utilized to construct the riser 12, in a manner
as described before with respect to FIGS. 1, 2 and 3, includes a
connecting upper end 56 and a connecting lower end 58 constructed
in a manner as particularly described below with respect to the
riser-sections 14, shown in FIGS. 5 and 6. As mentioned before, one
of the riser-sections 14 includes the underwater connecting end
144, and with respect to that one riser-section 14, only the
description of the connecting upper end 56 below is applicable, in
a preferred form.
Referring more particularly to the connecting upper end 56, as
shown more clearly in FIG. 5, an uppermost end 200 thereof is
beveled, thereby forming a beveled surface 202 extending about the
outer periphery of the riser-section 14, generally adjacent the
uppermost end 200 thereof. A groove 204 is formed in the inner
periphery of the connecting upper end 56, extending a distance
axially along the inner periphery thereof, and intersecting a
portion of the uppermost end 200 thereof. The groove 204 terminates
with a beveled end 206. The beveled end 206, more particularly,
forms an annular beveled surface 206 which extends about the inner
periphery of the connecting upper end 56, and is positioned therein
to matingly abut a portion of the connecting lower end 58 of an
adjoining riser-section 14, in a manner which will be made more
apparent below.
As shown in FIGS. 5 and 6, the support ring 60 is formed on a
portion of the outer periphery of the connecting upper end 56, and
extends a distance generally radially therefrom. The support ring
extends about the entire outer periphery of the connecting upper
end 56, generally near the uppermost end 200 thereof.
As shown more clearly in FIG. 5, a groove 208 is formed in a
portion of the outer periphery of the connecting lower end 58, the
groove 208 intersecting a portion of a lowermost end 210 of the
connecting lower end 58. More particularly, the lowermost end 210
of the connecting lower end 58 is beveled, thereby forming an
annular beveled surface 212 which extends about the outer periphery
of the connecting lower end 58, generally adjacent the lowermost
end 210 thereof. The beveled surface 212 matingly and positioningly
engages the beveled surface 206 formed in the connecting upper end
56 of an adjoining riser-section 14, in an interconnecting position
of the two riser-sections 14, as shown in FIG. 5.
The groove 208, as shown in FIG. 4, also extends a distance axially
along the outer periphery terminating with an annular end surface
213 which intersects a portion of the outer periphery of the
connecting lower end 58. The annular end surface 213 is beveled,
thereby forming a beveled surface 213 extending about the outer
periphery of the connecting lower end 58. In an assembled or
interconnecting position of two riser-sections 14, the uppermost
end 200 of the connecting upper end 56 engages a portion of the end
surface 213 and, in this position, the beveled surface 202 formed
on the connecting upper end 56 cooperates with the beveled surface
213 formed on the connecting lower end 58 of the adjoining
riser-section 14 to form a V-shaped groove 214 which extends about
the outer periphery of the interconnected riser-sections 14, as
shown more clearly in FIG. 5. The V-shaped groove 214 provides a
space wherein weld material is disposed so that the two riser
sections 14 can be weldingly joined in an interconnected
relationship, during the construction of the riser 12, as described
before.
In a preferred form, and as shown in FIG. 5, the connecting upper
end 56 and the connecting lower end 58 of the riser-sections 14 is
constructed as a separate component, and subsequently secured to a
pipe-section 216 to form each riser-section 14. The connecting
upper end 56 and the connecting lower end 58 will therefore be
sometimes used below to refer to the separate, individual
components which are secured to the pipe-section 216 to form the
riser-sections 14.
In this embodiment of the invention, that is where the connecting
upper end 56 and the connecting lower end 58 are constructed as
separate, individual components, each connecting lower end 58
includes an upper end 218 which is secured, or more particularly,
welded to a lower end 220 of one of the pipe-sections 216. As shown
in FIG. 5 and, in a preferred form, the upper end 218 of the
connecting lower end 58 is beveled, and the lower end 220 of the
pipe-section 216 is also beveled. The beveled surfaces 218 and 220
of the connecting lower end 58 and the pipe-section 216,
respectively, form a V-shaped groove 221 in an interconnected
position of the connecting lower end 58 and one of the
pipe-sections 216 to facilitate the welding interconnection
therebetween, as shown in FIG. 5. Each connecting upper end 56, in
this embodiment of the invention, includes a lower end 222 which is
secured or, more particularly, welded to an upper end 224 of one of
the pipe-sections 216. The lower end 222 and the upper end 224 of
the connecting upper end 56 and the pipe-section 216, respectively,
are beveled, and form a V-shaped groove 226 in an interconnected
position of the connecting upper end 56 and one of the
pipe-sections 216 to facilitate the welding interconnection
therebetween, as shown in FIG. 5.
It should be noted that the salient reason for forming the
connecting lower end 58 and the connecting upper end 56 as
separate, individual components, and subsequently securing each
connecting end 56 and 58 to the pipe-sections 216 is to facilitate
the manufacture of the riser-sections 14. Since each connecting end
56 and 58, in a preferred form, requires a certain amount of
machining to form the various beveled and tapered surfaces thereon,
the forming of the connecting ends 56 and 58 as a separate,
individual component reduces the cost of manufacture of the
constructed riser-sections 14, and with respect to a riser-section
14 having an extremely large diameter, it should be noted that, in
some instances, it may be extremely difficult to accurately machine
the connecting ends 56 and 58 on the pipe-sections 216.
OPERATION OF FIGS. 5 AND 6
The connecting upper end 56 and the connecting lower end 58,
described in detail above, not only facilitate the effecting of the
interconnection between two riser-sections 14, but also are
constructed to facilitate the guiding of the connecting lower end
58 of one of the riser-sections 14 into an adjoining and mating
relationship with respect to the connecting upper end 56 of another
riser-section 14, during the construction of the riser 12, as
described in detail above with respect to FIGS. 1, 2 and 3. More
particularly, utilizing the riser-sections 14, constructed as shown
in FIGS. 5 and 6, one of the riser-sections 14 is securedly and
supportingly positioned in the riser support assembly 34 such that
the connecting upper end 56 of the riser-section 14 thus supported
is disposed generally above the support arm assemblies 70 of the
riser support assembly 34.
The positioning assembly 38 is then utilized to move another
riser-section 14 to a position wherein the connecting lower end 58
of the riser-section 14 supported thereby is disposed in a
horizontal plane generally above the supported riser-section 14.
The operator will then actuate the positioning assembly 38 to a
lowering position, thereby lowering the riser-section 14 connected
thereto in the direction generally toward the connecting upper end
56 of the supported riser-section 14.
As the riser-section 14 is lowered by the positioning assembly 38,
the beveled surface 212 of the connecting lower end 58 will
initially engage a portion of the upper-most end 200 of the
connecting upper end 56 of the supported riser-section 14 to guide
the connecting lower end 58 into an interconnecting and mating
relationship with respect to the connecting upper end 56 of the
supported riser-section 14. More particularly, the connecting lower
end 58 is guided into an interconnecting and mating position
wherein the surface formed by the groove 204 of the connecting
upper end 56 engagingly and slidingly receives the surface formed
in the connecting lower end 58 by the groove 208 therein. The
riser-section 14 supported by the positioning assembly 38 is
further lowered to a position wherein the beveled surface 212
formed on the connecting lower end 58 positioningly engages the
beveled surface 206 formed about the inner periphery of the
connecting upper end 56.
The connecting lower end 58 and the connecting upper end 56
cooperate to maintain the riser-section 14 supported in the riser
support assembly 34 in an interconnecting and adjoining
relationship with respect to the riser-section 14 supported by the
positioning assembly 38 while the interconnecting weld is effected
by the various operating personnel, the interconnecting and
adjoining weld between the two riser-sections 14 being made
generally in the area between the two riser-sections 14 formed by
the V-shaped groove 214.
EMBODIMENT OF FIG. 7
Shown in FIG. 7, is a modified embodiment of the connecting lower
end 58a which may be preferred in some applications. The connecting
lower end 58a is constructed similar to the connecting lower end
58, shown in FIGS. 5 and 6, the salient difference being that a
beveled surface 230 is formed about the inner periphery of the
connecting lower end 58a, generally adjacent the lowermost end 210a
thereof.
The beveled surface 230 extends about the inner periphery of the
connecting lower end 58a and is shaped and positioned to cooperate
with the beveled surface 206 formed about the inner periphery of
the connecting upper end 56, such that when two riser-sections 14
are placed in an interconnecting and adjoining relationship, as
described before, the beveled surfaces 206 and 230 form a V-shaped
groove 232, as shown in FIG. 7. The V-shaped groove 232 extends
about the inner periphery of the two adjoining riser-sections 14,
and is positioned therebetween to facilitate an additional welding
interconnection between the two adjoining riser-sections 14 about
the inner periphery thereof, generally adjacent the interconnection
therebetween.
OPERATION OF FIG. 7
The connecting upper end 56 and the connecting lower end 58a, as
shown in FIG. 7, will operate similar to the connecting upper end
56 and the connecting lower end 58, as shown in FIGS. 5 and 6. The
salient difference resulting from utilization of the connecting
lower end 58a being that an additional interconnecting weld may be
effected between the two adjoining riser-sections 14.
This particular embodiment of the invention, as shown in FIG. 7,
may be particularly useful when constructing a riser 12, wherein
the riser-sections 14 have a relatively large inner diameter. In
this embodiment of the invention, the various riser-sections 14 are
preferably interconnectingly joined in a manner similar to that
described before. The underwater connecting end 144 of the
constructed riser 12 is then secured to the underwater connecting
end 140 of the underwater pipeline 18. The accumulated water in the
constructed riser 12 is then removed, in a manner to be described
below, and a welder on a supporting platform is lowered downwardly
through the constructed riser 12, in such a manner that the welder
can effect each additional welding interconnection in the area
formed by the V-shaped grooves 232.
It will be apparent to those skilled in the art from the foregoing,
that the embodiment of the riser construction apparatus 10 retains
all of the advantages described before with respect to the
embodiment shown in FIGS. 5 and 6, and in addition, provides
riser-sections 14 which can be more securedly bonded or welded in
an interconnecting relationship to form the completed, constructed
riser 12.
EMBODIMENT OF FIGS. 8 AND 9
In one form, the underwater connecting end 144 of the riser 12,
could be constructed substantially the same as the connecting lower
end 58, described in detail above. In that form of the invention,
the underwater connecting end 140 of the underwater pipeline 18
should be constructed substantially the same as the connecting
upper end 56, described in detail above, with the exception of the
support ring 60 which would not be necessary, as will be apparent
to those skilled in the art. However, in a preferred form, the
underwater connecting end 140 of the underwater pipeline 18 and the
underwater connecting end 144 of the lowermost riser-section 14 of
the constructed riser 12 are constructed in a different manner to
facilitate the underwater interconnection therebetween. A preferred
embodiment of the underwater connecting end 140 connected to the
underwater pipeline 18 and the underwater connecting end 144
connected to the constructed riser 12, and a preferred embodiment
of the guide coupling assembly 142 are shown in FIGS. 8 and 9.
As shown more clearly in FIG. 9, the underwater connecting end 140
of the underwater pipeline 18 and the underwater connecting end 144
of the constructed riser 12 are each, in a preferred form,
constructed as a separate, individual component, the underwater
connecting end 140 being secured to one end of one of the
pipe-sections forming the underwater pipeline 18 and the underwater
connecting end 144 being secured to the lowermost end of the first
connected or the lowermost riser-section 14. The underwater
connecting end 140 is thus sometimes referred to below as the
pipeline underwater connecting end 140, and the underwater
connecting end 144 is sometimes referred to below as the riser
underwater connecting end 144.
Referring more particularly to the underwater connecting end 140,
as shown more clearly in FIG. 9, the underwater connecting end 140
has an uppermost end 300 and a lower end 302. The lower end 302 of
the underwater connecting end 140 is secured to an upper end 304 of
the underwater pipeline 18 and, in a preferred form, the lower end
302 of the underwater connecting end 140 and the end 304 of the
underwater pipeline 18 are each beveled such that when the
underwater connecting end 140 is placed in an interconnecting
relationship with respect to the underwater pipeline 18, the
beveled ends 302 and 304 form a V-shaped groove 306 which extends
about the periphery of the interconnection therebetween. The
V-shaped groove 306 is provided to facilitate the welding
interconnection between the underwater connecting end 140 and the
underwater pipeline 18, as shown in FIGS. 8 and 9.
The underwater connecting end 144 has a beveled upper end 308 and a
beveled lowermost end 310. As shown more clearly in FIG. 9, the
upper end 308 of the underwater connecting end 144 is secured to a
beveled lowermost end 312 of the lowermost riser-section 14 of the
constructed riser 12. In an assembled position of the underwater
connecting end 144, the upper end 308 thereof and the lowermost end
312 if the constructed riser 12 cooperate to provide or form a
V-shaped groove 314 to facilitate the welding interconnection
between the one riser-section 14 and the underwater connecting end
144.
An annular flange 316 is formed on the outer periphery of the
underwater connecting end 140. The flange 316 extends generally
radially from the outer periphery of the underwater connecting end
140, and has a plurality of bolt-holes (not shown) formed
therethrough and spaced circumferentially thereabout, for reasons
which will become more apparent below.
An annular raised face 318 is formed on a portion of the flange
316, the uppermost end of the raised face 318 forming the uppermost
end 300 of the underwater connecting end 140. The raised face 318
extends circumferentially about the underwater connecting end 140,
and cooperates with the flange 316 to provide what is generally
referred to in the art as a raised face flange connection on the
underwater connecting end 140 of the underwater pipeline 18.
A groove 320 is formed in a portion of the inner periphery of the
underwater connecting end 140, extending a distance axially along
the inner periphery thereof, terminating with a beveled end 322.
The beveled end 322 formed in the underwater connecting end 140,
more particularly, forms a beveled surface 322 which extends about
the inner periphery of the underwater connecting end 140. The
beveled surface 322 of the underwater connecting end 140 cooperates
with the beveled end 310 of the underwater connecting end 144 to
form a V-shaped locking groove 324 in an interconnected position of
the underwater connecting ends 140 and 144. The V-shaped locking
groove 324 is provided to facilitate the welding interconnection
and to cooperatingly engage a portion of the guide coupling
assembly 142 to position the guide coupling assembly 142 in the
underwater pipeline 18, as will be described in greater detail
below.
As shown more clearly in FIG. 9, a radially outwardly tapering
surface 326 is formed in a portion of the groove 320, thereby
forming an annular tapered surface 326 extending about the inner
periphery of the underwater connecting end 140. A portion of the
tapered surface 326 intersects the uppermost end 30 of the
underwater connecting end 140. The surface formed by the groove
320, and the annular tapered surface 326 of the underwater
connecting end 140 is shaped to guidingly and contactingly engage a
portion of the underwater connecting end 144, as will be described
in more detail below.
An annular flange 328 is formed about a portion of the outer
periphery of the underwater connecting end 144, generally between
the upper end 308 and the lower end 310 thereof. The annular flange
328 extends a distance generally radially from the underwater
connecting end 144, thereby forming an annular upwardly facing
surface 329 and an annular downwardly facing surface 330, each
extending about the outer periphery of the underwater connecting
end 144. The downwardly facing surface 330 formed by the flange 328
is positioned on the underwater connecting end 144 to contactingly
engage a portion of the uppermost end 300 of the underwater
connecting end 140, in an interconnected position of the
constructed riser 12 and the underwater pipeline 18.
As shown in FIGS. 8 and 9, the uppermost end 300 of the underwater
connecting end 140 and the downwardly facing surface 330 of the
underwater connecting end 144 are each shaped to receive a seal
gasket 332 which is sealingly disposed therebetween. In one form,
the seal gasket 332 could provide the sealing integrity between the
constructed riser 12 and the underwater pipeline 18 and, in another
form, the seal gasket 332 provides a temporary fluid seal between
the constructed riser 12 and the underwater pipeline 18 to
sealingly prevent the leakage of fluid therebetween until such time
as the welding interconnection can be effected. In this latter
form, the seal gasket 332 remains in position to augment the
primary sealing integrity provided by the welding interconnection
formed between the constructed riser 12 and the underwater pipeline
18.
As shown in FIGS. 8 and 9, a groove 334 is formed in a portion of
the outer periphery of the underwater connecting end 144 of the
constructed riser 12, extending a distance axially along the outer
periphery thereof. A radially outwardly tapering surface 336 is
formed in a portion of the groove 330, thereby forming annular
tapered surface 336 extending about the outer periphery of the
underwater connecting end 144 and intersecting a portion of the
outer periphery thereof. The surfaces formed in the underwater
connecting end 144 by the groove 334 and the tapered surface 336
are each shaped to guidingly and matingly engage the surfaces
formed in the underwater connecting end 140 by the groove 320 and
the tapered surface 326, respectively, to position the constructed
riser 12 in an interconnecting relationship with respect to the
underwater pipeline 18.
As shown in FIGS. 8 and 9, an annular slip ring 338 is disposed
about the underwater connecting end 144 of the one riser-section
14. More particularly, the upwardly facing surface 329 of the
flange 328 is shaped to slidingly and supportingly engage the slip
ring 338, thereby supporting the slip ring 338 on the underwater
connecting end 144 in one direction. A plurality of bolt-holes (not
shown) are formed through the slip ring 338, and the bolt-holes
formed therethrough are spaced circumferentially about the slip
ring 338 to cooperatingly align with the bolt-holes (not shown)
formed through the flange 316, such that in the interconnecting and
assembled position of the constructed riser 12 and the underwater
pipeline 18, shown in FIG. 9, the bolt-holes of the slip ring 338
and the bolt-holes of the flange 316 receive a plurality of
interconnecting bolts 340.
It should be noted that, in an alternate form, a flange could be
formed on the outer periphery of the underwater connecting end 144
having the bolt-holes formed therethrough in lieu of the slip ring
type of connecting end described above. Although this alternate
form may, in some instances be less expensive to manufacture, the
slip ring type of connecting end is preferred, since it does
facilitate a quicker, more efficient alignment of the bolt-holes
for the underwater bolting interconnection.
Referring more particularly to the guide coupling assembly 142, as
shown in FIG. 8, the guide coupling assembly 142 is constructed to
be securedly, removably, and sealingly positioned in a portion of
the underwater pipeline 18 to sealingly prevent fluid from entering
the underwater pipeline 18 via one end thereof and to guidingly
contact a portion of the constructed riser 12 as the constructed
riser 12 is being lowered into an interconnecting relationship with
respect to the underwater pipeline 18, in a manner which will be
described in more detail below.
The guide coupling assembly 142 includes a hollow tubular shaped
support base 350 having an upper end 352 and a lower end 354. The
support base 350 is disposed in a portion of the underwater
pipeline 18 generally near the underwater connecting end 140
connected thereto, in an assembled position of the guide coupling
assembly 142, as shown in FIG. 8.
A circular shaped plate 356 is secured to the upper end 352 of the
support base 350. The circular shaped plate 356 is sized to
encompass the upper end 352 and, more particularly, the diameter of
the plate 356 is larger than the diameter of the support base 350
and thus a portion of the plate 356, generally adjacent an outer
periphery 358 thereof, extends beyond the outer periphery of the
support base 350. The portion of the plate 356 extending beyond the
outer periphery of the support base 350 provides an annular
downwardly facing surface 350 extending generally radially from the
support base 350 and about the entire outer periphery thereof, for
reasons which will be made more apparent below.
A circular-shaped, lower end plate 362 is connected to the lower
end 354 of the support base 350, as shown in FIG. 8. More
particularly, the lower plate 362 is secured to the lower end 354
of the support base via an L-shaped, annular ring 364. A portion of
the L-shaped ring 364 is secured to a portion of the lower plate
362, and another portion of the L-shaped ring is secured to the
lower end 364 of the support base 350, thereby providing the
interconnection therebetween. As shown in FIG. 8, the lower plate
362 has a larger diameter than the diameter of the support base
350, and a portion of the lower plate 362, generally adjacent an
outer periphery 366 thereof, cooperates with the L-shaped ring 364
to provide an annular space 368 therebetween.
An annular seal member 370 is connected to the support base 350
and, more particularly, the seal member 370 has an annular ring
shaped portion 372 which is disposed generally in the space 368, in
an assembled position of the seal member 370. The ring shaped
portion 372, in a preferred form, is larger than the space 368, and
the seal member 370 is thus compressingly and sealingly secured in
an assembled position generally in the space 368 by a plurality of
bolts 374 (only two of the bolts 374 are shown in FIG. 8).
The seal member 370 has an annular seal end 376 which extends
radially beyond the outer periphery 366 of the lower plate 362, and
is sized to slidingly engage an adjacent portion of the inner
periphery of the underwater pipeline 18, in one position of the
guide coupling assembly 142. A pair of annular, tapered surfaces
378 and 380 are formed on the seal member 370, generally adjacent
the seal end 376 thereof. The tapered surface 378 is sized and
disposed to be engaged by fluid entering the underwater pipeline 18
via the underwater connecting end 140 thereof such that the fluid
biases the seal end 376 of the seal member 370 into sealing
engagement with an adjacent portion of the inner periphery of the
underwater pipeline, thereby forming a fluid seal between the guide
coupling assembly 142 and the underwater pipeline 18, in one
position of the seal member 370. The tapered surface 378 is also
sized and disposed to be cooperatingly engaged by a portion of a
bias assembly, the bias assembly augmenting the sealing engagement
between the seal member 370 and the adjacent portion of the inner
periphery of the underwater pipeline 18, in a manner to be
described in more detail below.
The tapered surface 380 is sized such that, in an assembled
position of the guide coupling assembly 142, any pressure which
might exist in the underwater pipeline 18, generally below the
guide coupling assembly 142, will act on the tapered surface 380 in
such a manner that such pressure augments the sealing engagement
between the seal member 370 and the adjacent portion of the inner
periphery of the underwater pipeline 18.
A cone-shaped guide 382, having a cylindrically shaped base portion
384 is secured to the upper plate 356 of the guide coupling
assembly 142. More particularly, one end of the cylindrically
shaped base 354 is secured to an upper portion of the upper plate
356, and the opposite end of the cylindrically shaped base 354 is
secured to a lower, circular-shaped end of the cone-shaped guide
382. The cylindrically shaped base 384 of the cone-shaped guide 382
has an outer periphery 385, and the outer surface formed by the
cone-shaped guide 382 and the outer periphery 385 of the base 384
are each sized and positioned on the guide coupling assembly 142 to
provide a guiding surface which guidingly engages a portion of the
underwater connecting end 144 to guide the underwater connecting
end 144 of the one riser-section 14 into an interconnecting
engagement with the underwater connecting end 140 connected to the
underwater pipeline 18, in a manner to be made more apparent
below.
As shown in FIG. 8, a flat surface 386 is formed on the apex or
upper end of the cone-shaped guide 382, and an aperture 388 is
formed through a central portion of the flat end 386. In a
preferred form and as shown in FIG. 8, the rod 390 is secured in a
portion of the flat end 386 of the cone-shaped guide 382, the rod
390 forming the apex of the cone-shaped guide 382. The rod 390 is
also positioned to guidingly engage a portion of the underwater
connecting end 144 of the constructed riser 12.
A cylindrically shaped support member 392 is secured to a central
portion of the upper surface of the upper plate 356. The support
member 392 extends generally axially from the upper plate 356,
terminating with an uppermost end 394. A portion of the support
member 392, generally adjacent the uppermost end 394 thereof, is
flanged radially outwardly, thereby providing an extended,
substantially flat support surface 396, for reasons which will be
made more apparent below.
An aperture 400 is formed through a central portion of the support
member 392, and extends axially therethrough through-intersecting
the opposite ends thereof. As shown in FIG. 8, an aperture 402 is
formed through a central portion of the upper plate 356 and, in an
assembled position of the guide coupling assembly 142, the aperture
400 through the support member 392 is aligned with the aperture 402
through the upper plate 356. The apertures 400 and 402 are also
axially aligned with the aperture 388 through the end 386 of the
cone-shaped guide 382, for reasons which will be made apparent
below.
As shown in FIG. 8, an elongated rod 404 is reciprocatingly
supported in the guide coupling assembly 142. A portion of the
elongated rod 404 extends through the aperture 386 and through the
apertures 400 and 402. The rod 404 has an eyelet 406 formed on one
end thereof, the eyelet 406 being sized larger than the aperture
388, as shown in FIG. 8. A portion of the rod 404 generally
adjacent the lowermost end 408 thereof, is threaded, for reasons
which will be made apparent below.
A seal bias assembly 410 is supported in a portion of the base 350
or, more particularly, on the rod 404, generally adjacent the lower
end 408 thereof. The seal bias assembly 410 is constructed to
biasingly engage a portion of the seal member 370, in one position
thereof, to bias the seal end 376 of the seal member 370 into
sealing engagement with an adjacent portion of the inner periphery
of the underwater pipeline 18.
As shown in FIG. 8, the seal bias assembly 410 has a cylindrically
shaped base 412, having an aperture 414 formed through a central
portion thereof, and opposite ends 416 and 418. The aperture 414 of
the base 412 is sized to receive a portion of the elongated rod
404, generally adjacent the lower end 408 thereof, in an assembled
position of the guide coupling assembly 142. A predetermine number
of flanges 420 (only two of the flanges 420 are shown in FIG. 8)
are connected on one end thereof to a portion of the rod 404 or,
more particularly, secured on one end thereof to a portion of the
outer periphery of the base 412. Each flange 420 extends radially
from the base 412 terminating with an outermost end portion 422
thereof. As shown in FIG. 8, a plurality of openings 423 (only two
of the openings 423 are shown in FIG. 8) are formed through a
portion of the support base 350, and each flange 420 extends
through one of the openings 423.
An annular ring 424 is secured to the outermost end 422 of each
flange 420. The annular ring 424 is, more particularly,
cylindrically shaped, and is supported in an assembled position,
shown in FIG. 8, by each of the flanges 420, each flange 420 being
secured to a portion of the ring 424. An annular bias ring 426 is
secured to a lowermost end portion of the cylindrically shaped ring
424, as shown in FIG. 8.
The seal bias assembly 410 and, more particularly, the bias ring
426 secured thereon is disposed in the guide coupling assembly 142
and constructed to biasingly engage a portion of the tapered
surface 378 of the annular seal member 370, thereby biasing the
seal end 376 of the seal member 370 into sealing engagement with an
adjacent portion of the underwater pipeline 18, in one position of
the seal bias assembly 410.
The seal bias assembly 410 is secured in an assembled position on
the rod 404 via a nut 428 which is threadedly secured to the
threaded portion 408 of the rod 404. The nut 428, more
particularly, engages a portion of the end 418 of the base 412 to
limit the movement of the base 412 in one direction on the rod
404.
The seal bias assembly 410 also includes a bias plate 430 having an
aperture 432 formed through a central portion thereof. As shown in
fIG. 8, and in an assembled position of the guide coupling assembly
142, the rod 404 extends through the aperture 432 of the bias plate
430. A flange 434 is formed on one end of the bias plate 430 and
extends radially a distance therefrom, thereby providing a
downwardly facing surface 436 and an upwardly facing surface 438
each extending annularly about one end of the bias plate 430.
In an assembled position as shown in FIG. 8, the downwardly facing
surface 438 engages the upwardly facing surface 416 of the base
412, and a bias spring 440 is disposed generally between the upper
plate 356 secured to the support base 350 and the bias plate 430 of
the seal bias assembly 410. More particularly, one end of the bias
spring 440 is in engagement with a portion of the upper plate 356
and the opposite end of the bias spring 440 biasingly engages the
portion of the upwardly facing surface 438 of the bias plate 430.
The bias spring 440 is disposed generally about a portion of the
elongated rod 404, and is sized to biasingly engage the bias plate
430, and thus the flanges 420, thereby biasingly moving the bias
plate 430 and the flanges 420 in a biasing direction 442, generally
toward the lower end plate 362 of the support base 350.
A stop 444 is secured to a portion of the elongated rod 404, and
the stop 444 is positioned on the rod 404 generally below the upper
plate 356 of the support base 350. The stop 444 has an upwardly
facing surface 446 formed thereon which is shaped and positioned to
engage a portion of the upper plate 356 to limit the movement of
the rod 404 in a non-biasing direction 448, for reasons and in a
manner to be described in greater detail below.
A guide coupling assembly 142 also includes a support 450 which is
secured to a portion of the rod 404, generally between the eyelet
406 end thereof and the upper plate 356 via a pair of pins 452. The
support 450 has a flange formed on one end thereof extending
generally radially therefrom, thereby forming an upwardly facing
support surface 454 and downwardly facing surface 456 extending
generally about the support 450. As shown in FIG. 8, a flange 458
is secured on one end thereof to a portion of the inner periphery
of the cone-shaped guide 382, thereby providing a downwardly facing
surface 460 in the guide coupling assembly 142, for reasons which
will be made more apparent below.
As shown in FIG. 8, a first jack assembly 462 is disposed generally
between the support surface 396 of the support member 392 and the
downwardly facing surface 456 of the support member 450. More
particularly, the base of the first jack assembly 462 is supported
on the support surface 396 of the support member 392, and the
reciprocating element of the first jack assembly 462 engages a
portion of the downwardly facing surface 456 of the support member
450, in one position of the first jack assembly 462. The base of
the first jack assembly 462 is thus positioned in the guide
coupling assembly 142 and the reciprocating element of the first
jack assembly 462 engages the elongated rod 404 via the engagement
thereof with the support member 450 to move the elongated rod 404,
in a manner to be described in greater detail below.
The first jack assembly 462 is constructed such that the first jack
assembly 462 may be actuated to move the reciprocating element
therein in a generally upward direction 464 or in a generally
downwardly direction 466. Jack assemblies of a nature generally
described above are well known in the art and may be hydraulically
or pneumatically operated, for example, and a detailed description
of the construction and operation thereof is not required
herein.
A second jack assembly 468, constructed similar to the first jack
assembly 462, is disposed generally between the upwardly facing
surface 454 of the support member 450 and a downwardly facing
surface 460 of the flange 458. More particularly, the base of the
hydraulic jack assembly 468 is supported on the upwardly facing
surface 454 of the support member 450 and the reciprocating element
of the second jack assembly 468 is in engagement with a portion of
the downwardly facing surface 460 of the flange 458. The second
jack assembly 468 is constructed to be actuated to a position
wherein the reciprocating element thereof is moved to a generally
upwardly direction 470 and to a position wherein the reciprocating
element thereof is moved in a generally downwardly direction
472.
An access opening 473 is formed through a portion of the
cone-shaped guide 382, as shown in FIG. 8. The access opening 473
is shaped to permit the first and the second jack assemblies 462
and 468 to be inserted therethrough and removed therefrom, during
the operation of the guide coupling assembly 142, for reasons which
will be made apparent below.
As shown in FIG. 8, the guide coupling apparatus 142 also includes
a pair of clamp assemblies 474 which are partially disposed in the
hollow portion of the support base 350. Each clamp assembly 474
includes a jaw member 476 with is pivotally secured to a flange 478
via a pin 480. The flange 478 is secured to a portion of the lower
end of the upper plate 356.
The clamp assemblies 474 also include a jaw bias spring 482, one
jaw bias spring 482 being biasingly secured to each jaw member 476.
More particularly, one end of each jaw bias spring 482 is secured
to one end portion of one of the jaw members 476 and the opposite
end of each jaw bias spring 482 is secured to a portion of the
support base 350, as shown in FIG. 8. Each jaw biasing spring 482
is sized and connected to one of the jaw members 476 to bias the
jaw members 476 in a bias direction 484 to a position wherein a
portion of each jaw member 476 extends radially from the support
base 350 through an opening in the support base 350, and engages a
portion of the underwater connecting end 140, for reasons to be
made more apparent below.
As shown in FIG. 8, one end portion of each jaw member 476 has a
V-shaped flange tip 486 formed thereon. Each flange tip 486 is
sized and positioned to engage a portion of the beveled surface 324
formed about the inner periphery of the underwater connecting end
140 to securedly position the guide coupling assembly 142 in an
assembled position in the underwater pipeline 18.
It should also be noted that although only two clamp assemblies 474
have been shown in FIG. 8, that in actual practice a plurality of
jaw assemblies 478 may be pivotally secured to the upper plate 356
and circumferentially spaced thereabout. This latter form, that is
where the guide coupling assembly 142 includes a plurality of clamp
assemblies 474 may be particularly desirable in a guide coupling
assembly constructed to be utilized with a constructed riser and
the underwater pipeline having relatively large inner
diameters.
The guide coupling assembly 142, as shown in FIG. 8, also includes
a submergable pump assembly 490 which is supported within a portion
of the cone-shaped guide 382 generally above the upper plate 356.
The submergable pump assembly 490 is, more particularly,
constructed and disposed in the guide coupling assembly 142 to
pump-out any fluid existing in the constructed riser 12 and the
underwater pipeline 18 generally above the seal member 370 of the
guide coupling assembly 142, so that the guide coupling assembly
142 can be more easily removed from an assembled position in the
underwater pipeline 18 after the constructed riser 12 has been
secured to the underwater pipeline 18. Submergable pumps
constructed to function in a manner generally as described above
with respect to the submergable pump assembly 490 are well known in
the art, and a detailed description of the construction and
operation thereof is not required herein.
An eyelet 492 is secured to a central portion of the lower plate
362, as shown in FIG. 8. The eyelet 492 is provided to facilitate
the transportation of the guide coupling assembly 142.
OPERATION OF FIGS. 8 AND 9
The guide coupling assembly 142 is constructed to guide the
underwater connecting end 144 of the constructed riser 12 into a
mating and interconnecting engagement with the underwater
connecting end 140 of the underwater pipeline 18, and is
constructed to sealingly prevent fluid from entering into the
underwater pipeline 18 to maintain a maximum buoyancy of the
underwater pipeline 18. In practice and in a preferred form, the
underwater pipeline 18 is constructed from a marine support member
such as, for example, a barge, and as each pipe-section is secured
in an interconnecting relationship aboard the barge, the
interconnected pipe-sections are lowered and eventually disposed on
the floor of the body of water, in a manner well known in the art.
Thus, the underwater pipeline 18 is finally disposed in the water
only after a sealing interconnection has been effected between the
various pipe-sections, thereby substantially eliminating the
buildup of water within the hollow portion of the underwater
pipeline 18. The last pipe-section interconnected to the underwater
pipeline 18 generally includes at least one 90.degree. turn and, in
some instances, will include more than one 90.degree. turn, so that
the end of the underwater pipeline 18 to be interconnected to the
riser 12 will be disposed in a substantially vertical position, in
an assembled position of the underwater pipeline 18, on the
waterbody floor. In a preferred form, after the last pipe-section
has been secured to the underwater pipeline 18, the guide coupling
assembly 142 will be placed and secured in an assembled position
generally through the underwater connecting end 140 of the
underwater pipeline 18.
Prior to inserting the guide coupling assembly 142 through the
underwater connecting end 140 of the underwater pipeline 18, the
second jack assembly 468 is actuated to a position wherein the
reciprocating element disposed therein is disengaged from the
downwardly facing surface 460 of the flange 458. The first jack
assembly 462 is actuated such that the reciprocating element
therein engages and moves the support member 450 in an upwardly
direction 464, thereby moving the elongated rod 404 in a generally
upwardly direction 464.
The elongated rod 464 is moved by the first jack assembly 462 in an
upwardly direction 464 to a position wherein the stop 444 secured
on the elongated rod 404 engages the upper plate 356, thereby
limiting the upward movement of the elongated rod 404. It will be
apparent to those skilled in the art, that when the first jack
assembly is actuated to move the elongated rod 404 in an upwardly
direction 464 against the bias tension of the bias spring 440, the
flanges 420 will also be moved in a generally upwardly direction
464, thereby disengaging the bias ring 426 from the annular seal
member 370.
In this position of the seal bias assembly 410, that is a position
wherein the bias ring 426 is disengaged from the annular seal
member 370, the seal member 370 is in what may be referred to as a
relaxed position, and in that position, the seal member 370 will
slidingly engage the inner periphery of the underwater pipeline 18.
In this position the guide coupling assembly 142 is positioned to
be inserted through the underwater connecting end 140 and disposed
in an assembled position in the underwater pipeline 18.
The guide coupling assembly 142 is then inserted through the
underwater connecting end 140 of the underwater pipeline 18. As the
guide coupling assembly 142 is being inserted downwardly through
the underwater connecting end 140 of the underwater pipeline 18,
the seal end 376 of the seal member 370 will slidingly engage the
inner periphery of the underwater pipeline 18. Since the seal
member 370 slidingly engages the inner periphery of the underwater
pipeline 18 during the insertion of the guide coupling assembly 142
therein, the possibility of the seal member 370 being damaged or
destroyed during the insertion of the guide coupling assembly 142
in the underwater pipeline 18 is substantially reduced.
The guide coupling assembly 142 will be lowered through the
underwater pipeline 18 to a position wherein the V-shaped flange
tip 486 of each jaw member 476 engages a portion of the beveled
surface 322 formed about the underwater connecting end 140. The
engagement of each flange tip 486 with the beveled surface 322
tends to bias each jaw member 476 in a bias direction 484. The
engagement of each jaw member 476 with a portion of the upper plate
356 limits the movement of each jaw member 476 in a bias direction
484, thereby maintaining the engagement of each flange tip 486 with
a portion of the beveled surface 322, and positioning the guide
coupling assembly 142 in an assembled position in the underwater
pipeline 18.
In the assembled position of the guide coupling assembly 142, shown
in FIG. 2, the seal member 370 is disposed in a horizontal plane
generally below the upper end 300 of the underwater connecting end
140, and the cone-shaped guide 382 extends a distance axially above
the upper most end 300 of the underwater connecting end 140.
After the guide coupling assembly 142 has been positioned in the
underwater pipeline 18, as described above, the first jack assembly
462 is actuated to move the reciprocating element therein in a
vertically downward direction 466, to a position wherein the
reciprocating element is disengaged from the downwardly facing
surface 456 off the support member 450. The first jack assembly 462
may then be removed via the access opening 473 from the guide
coupling assembly 142.
It will be apparent from the foregoing that as the first jack
assembly 466 is disengaged from the support member 450, that the
elongated rod 404 will be biased in a downwardly direction 482 via
the bias spring 440. The bias spring 440 will thus bias the
elongated rod 404 to a position wherein the bias ring 426 biasingly
engages a portion of the tapered surface 378 of the seal member
370. The seal member 370 will be biased by the bias ring 426 in a
radially outwardly direction into a sealing engagement with the
adjacent portion of the inner periphery of the underwater pipeline
18.
In some applications, it may be desireable to augment the biasing
action of the bias spring 440 to create an even tighter or more
sealingly secure engagement between the seal member 370 and the
inner periphery of the underwater pipeline 18. In those
applications, the second jack assembly 468 is then actuated to move
the reciprocating element therein in an upwardly direction 470 and
into engagement with the downwardly facing surface 460 of the
flange 458.
The second jack assembly 468 will thus bias the rod 404 in a
downwardly direction, thereby augmenting the biasing force of the
bias spring 440. In this manner, the bias ring 426 is moved into
further engagement with the tapered surface 378 of the seal member
370, thereby increasing the sealing integrity between the seal
member 370 and the underwater pipeline 18. The downward movement of
the rod 404 is limited by the position of the lower plate 362 which
will engage the lower end 408 of the rod 404.
After the guide coupling assembly 142 has been sealingly positioned
in the underwater pipeline 18, the underwater pipeline 18 can be
lowered into the body of water and positioned therein to receive
and be connected to the constructed riser 12. In one form, for
example, the underwater pipeline 18 including the portion thereof
adjacent the underwater connecting end 140 thereof is lowered into
the body of water and positioned substantially as shown in FIG. 1
with respect to the platform 16.
After the underwater pipeline 18 has been positioned in the body of
water to receive the constructed riser 12, the constructed riser 12
is then lowered, the underwater connecting end 144 thereof being
lowered downwardly toward the underwater connecting end 140 of the
underwater pipeline 18. The guiding surface formed by the cone
guide 382, including the outer periphery 385 of the base 384
thereof, will initially guidingly contact the underwater connecting
end 144, and guide the underwater connecting end 144 generally
toward an interconnecting relationship with respect to the
underwater connecting end 140 of the underwater pipeline 18.
As the constructed riser 12 is being guided by the cone-shaped
guide 382 and the cylindrically shaped base 384, the lower end 310
of the underwater connecting end 144 will initially engage the
tapered surface 326 of the underwater connecting end 140. A portion
of the underwater connecting end 144 generally adjacent the lower
end 310 thereof will move along the tapered surface 326 of the
underwater connecting end 140, and ultimately will engage and move
along the surface of the underwater connecting end 140 formed by
the groove 320 therein. The downwardly facing surface 330 formed on
the underwater connecting end 144 will engage the upwardly facing
surface formed on the underwater connecting end 140 by the upper
end 300 thereof, thereby limiting the downward movement of the
constructed riser 12 into the underwater pipeline 18.
It should be noted that in a preferred form, a diver will position
himself generally near the underwater connecting end 140 of the
underwater pipeline 18 prior to the constructed riser 12 being
finally lowered into a mating and interconnecting relationship
therewith. The diver, in this form, will initially position the
underwater connecting end 144 generally above the guide coupling
assembly 142, such that as the constructed riser 12 is lowered, the
underwater connecting end 144 thereof will be positioned in guiding
contact with the guide surface formed by the cone guide 382 and the
guide surface formed by the cylindrically shaped base 384.
The diver, in a preferred form, will deactuate the second jack
assembly 468 prior to the constructed riser 12 being lowered into
engagement with the underwater pipeline, connect a cable (not
shown) to the eyelet 406 of the elongated rod 404, and connect the
proper hydraulic lines (not shown) to the submergable pump assembly
490. Thus, during that period of time while the constructed riser
12 is being lowered over the guide coupling assembly 142, the bias
spring 440 provides the only biasing force acting upon the seal
member 370 to bias the seal member 370 into a sealing engagement
with the underwater pipeline 18.
After the underwater connecting end 144 has been positioned in
interconnecting engagement with the underwater connecting end 140,
the diver will then secure the constructed riser 12 to the
underwater pipeline 18 by securing the bolts 340 about the
interconnection therebetween. Since the slip ring 338 is in sliding
engagement with the flange 328, the slip ring 338 can be easily and
quickly positioned by the diver to a position wherein the bolt
holes therethrough align with the bolt holes through the flange
316.
After the constructed riser 12 has been boltingly secured to the
underwater pipeline 18, the submergable pump assembly 490 is
actuated, and the fluid in the underwater pipeline 18 generally
between the seal member 370 and the underwater connecting end 140
thereof and the fluid in the constructed riser 12 will be pumped
out via the submergable pump assembly 490.
After the fluid in the constructed riser 12 and the underwater
pipeline 18 has been removed therefrom by the submergable pump
assembly 490, the guide coupling assembly 142 is removed by raising
the cable which has been connected to the eyelet 406 of the rod
404. It will be apparent from the foregoing that as the rod 404 is
pulled in an upwardly direction by the cable, the rod will be moved
or reciprocated upwardly against the biasing force of the bias
spring 440, thereby disengaging the bias assembly 440 from the seal
member 370. The seal end 376 of the seal member 370 is thus in
sliding engagement with the inner periphery of the underwater
pipeline 18, as the guide coupling assembly 142 is being removed
from the underwater pipeline 18 in the constructed riser 12.
As the guide coupling assembly 142 is initially pulled in an upward
direction, a portion of the flange tip 486 will initially engage
the lower end 310 of the underwater connecting end 144, the
underwater connecting end 144 thereby biasing each jaw member 476
in a direction generally opposite the bias direction 484 and
against the biasing force of the springs 482. The flange tip 486
will thus be removed from the V-shaped groove 324, and will engage
the inner periphery of the constructed riser 12 as the guide
coupling assembly 142 is being removed from the underwater pipeline
18 and the constructed riser 12.
After the guide coupling assembly 142 has been removed, the
underwater connecting end 140 and the underwater connecting end 144
can be welded in an interconnecting position, the weld being
effected generally in the groove 324 formed therebetween. In this
manner, an additional sealing securedness is provided between the
constructed riser 12 and the underwater pipeline 18.
It will be apparent from the foregoing to those skilled in the art
that the guide coupling assembly 142, not only provides a guiding
surface so that the constructed riser 12 can be quickly and
efficiently guided into an interconnecting and mating engagement
with the underwater pipeline 18, but also sealingly prevents fluid
from entering the underwater pipeline 18, thereby maintaining the
buoyancy of the underwater pipeline 18. This latter feature of the
guide coupling assembly 142 is particularly important with respect
to underwater pipelines and risers having relatively large
diameters, since the buoyant effect resulting from the absence of
water in the underwater pipeline 18 is necessary to maintain a
maneuverability of the underwater pipeline 18 so that the
underwater pipeline 18 can be more quickly, efficiently and safely
maneuvered to a proper position to be connected to a riser. The
guide coupling assembly 142 also provides the support structure for
the submergable pump assembly 490, thereby enabling the constructed
riser 12 to be connected to the underwater pipeline, and the fluid
accumulated in the connected riser 12 to be more efficiently pumped
therefrom.
It should also be noted that the underwater connecting end 140 and
the underwater connecting end 144, described above, cooperate with
the guide coupling assembly 142 to guide the constructed riser 12
into a mating and interconnecting engagement with the underwater
pipeline 18 in such a manner that the possibility of damage
occuring to the seal member 332 is minimized.
EMBODIMENT OF FIG. 10
Shown in FIG. 10, is a modified guide coupling assembly 142a which
is constructed similar to the guide coupling assembly 142, shown in
FIG. 8, described in detail before. The salient difference between
the guide coupling assembly 142a, shown in FIG. 10, and the guide
coupling assembly 142, described before, is that the guide coupling
assembly 142a does not include the various components, assemblies
and apparatus to provide the fluid seal between the guide coupling
assembly and the underwater pipeline 18.
OPERATION OF FIG. 10
The guide coupling assembly 142a, shown in FIG. 10, will operate
substantially the same as the guide coupling assembly, shown in
FIG. 8, described in detail before, to guide the underwater
connecting end 144 of the constructed riser 12 into interconnecting
and mating engagement with the underwater connecting end 140 of the
underwater pipeline 18. After the underwater connecting end 140 has
been securedly connected to the underwater connecting end 144 via
the bolts 340, the guide coupling assembly 142 is removed from the
underwater pipeline 18 in the constructed riser 12 via a cable
which, in this form of the invention, is secured to the rod
390.
The modified guide coupling assembly 142a provides a guide coupling
to guide the constructed riser 12 into interconnecting and mating
engagement with the underwater pipeline 18, which is less expensive
to manufacture, which may be useful in some applications where a
presence of fluid in the underwater pipeline 18, and thus the
reduced maneuverability of the underwater pipeline 18 will not
detrimentally affect the overall construction operation.
EMBODIMENT OF FIG. 11
Shown in FIG. 11 is a modified underwater connecting end 140a and a
modified underwater connecting end 144a, which may be utilized in
cooperation with the underwater pipeline 18 and the constructed
riser 12, respectively, in some applications. The salient
difference between the underwater connecting end 140a, shown in
FIG. 11, and the underwater connecting end 140, shown in FIGS. 8
and 9, is that the tapered surface 326a formed in the underwater
connecting end 140a extends downwardly from the upper end 300,
terminating with the beveled surface 322a formed about the inner
periphery of the underwater connecting end 140a. The salient
difference between the underwater connecting end 144a, shown in
FIG. 11, and the underwater connecting end 144, shown in FIGS. 8
and 9, is that the tapered surface 336a formed on the outer
periphery of the underwater connecting end 144a extends downwardly
along the outer periphery of the underwater connecting end 144a,
intersecting the lower end 310a thereof. In other words, the
underwater connecting end 144a and the underwater connecting end
140a have single tapered mating surfaces to form the guiding
interconnection therebetween.
OPERATION OF FIG. 11
The underwater connecting end 144a and the underwater connecting
end 140a, shown in FIG. 11, will operate substantially the same as
the underwater connecting end 144 and the underwater connecting end
140, shown in FIGS. 8 and 9, described in detail before. The
tapered mating surfaces 326a and 336a cooperate to position the
underwater connecting end 144a of the constructed riser 12 in
mating and interconnecting engagement with the underwater
connecting end 140a of the underwater pipeline 18.
The additional sealing securedness of a welded interconnection
between the underwater connecting end 144a and the underwater
connecting end 140a is still effected generally in the groove 324a,
which is also sized to cooperate with the jaw members 476 to
position the guide coupling assembly 142 in the underwater pipeline
18, in a manner similar to that described before.
It is apparent from the foregoing, that the underwater connecting
end 144a and the underwater connecting end 140a, shown in FIG. 11,
each retain most of the advantages of the underwater connecting end
144 and the underwater connecting end 140, described before, and
yet provide a single tapered surface which may be less costly to
manufacture, in some instances.
EMBODIMENT OF FIGS. 12, 13 AND 14
A preferred embodiment of the flange alignment assembly 146 is
shown in detail in FIGS. 12, 13 and 14. As mentioned before, the
salient purpose or function of the flange alignment assembly 146 is
to properly align the bolt holes formed through a portion of the
underwater connecting end 144 with the bolt holes formed through a
portion of the underwater connecting end 140, so that a diver can
more quickly, safely and efficiently secure the bolting
interconnection between the constructed riser 12 and the underwater
pipeline 18.
As mentioned before and shown in FIG. 12, the slip ring 338 has a
plurality of bolt holes 500 formed therethrough and spaced
circumferentially thereabout, and the flange 316 of the underwater
connecting end 140 also has a plurality of bolt holes 502, shown in
FIGS. 12 and 13, formed therethrough and spaced circumferentially
thereabout.
In a preferred form, and as shown in FIGS. 12, 13 and 14, the
flange alignment assembly 146 includes at least two pair of pin
guide assemblies 504. Each pin guide assembly 504 includes a pair
of removable guide members 506 which are generally triangularly
shaped in one cross-section, as shown more clearly in FIG. 12, and
arcuately shaped in another cross-section, as shown more clearly in
FIG. 13.
Each guide member 506 has a base 508, an upper end 510 and guide
sides 512 and 514, as shown more clearly in FIG. 12. In an
assembled position of the pin guide assemblies 504, each base 508
is removably supported on the upwardly facing surface of the flange
316.
Each guide member 504 includes a pair of cylindrically shaped plugs
516, one end of each plug being secured to a portion of the base
508 of each guide member 506. The plugs 516 are secured and
position on the base 508 of each guide member 506 such that, in the
assembled position thereof, as shown in FIGS. 12, 13, and 14, each
plug 516 is partially disposed through one of the bolt holes 502 in
the flange 316. In the assembled position, each guide member 506 is
positioned on the flange 316 so that one of the bolt holes 502
through the flange 316 is positioned generally between each pair of
guide members 506, for reasons which will be made apparent
below.
In the assembled position of each pin guide assembly 504, described
above, the side 512 of one of the guide members 506 and the side
514 of the other guide member 506 of each pin guide assembly 504
cooperate to provide a generally funnel-shaped guide path 518
therebetween. As shown more clearly in FIG. 12, the guide path 518
is wider generally adjacent the upper ends 510 of the guide members
506 with respect to the width of the guide path 518 generally near
the bases 508 of the guide members 506. In other words, the guide
path 518 generally funnels toward one of the bolt holes 502 formed
in the flange 316, as shown more clearly in FIG. 13, for reasons
which will be made more apparent below.
The flange alignment assembly 146 also includes one pin 520 to
cooperate with each pin guide assembly 504. As shown more clearly
in FIGS. 12 and 14, each pin 520 has an upper end 522 and a lower
end 524, and each pin 520 is removably disposed through one bolt
hole 500 in the slip ring 338 to a position wherein a portion of
each pin 520 generally near the upper end 522 thereof is disposed
above the upwardly facing surface of the slip ring 338.
A C-shaped clamp 526 is connected to each pin 520, generally near
the upper end 522 thereof, as shown more clearly in FIG. 14. Each
C-shaped clamp 526 is more particularly, pivotally secured to each
pin 520 by a pivot pin 528, such that the C-shaped clamp 526 can be
pivoted to a locking position wherein each C-shaped clamp 526
engages a portion of the slip ring 338 to secure the pin 520
connected thereto in an assembled position, as shown in FIGS. 12
and 14. Each C-shaped clamp 526 is also pivotable to a detached
position, as shown in dashed-lines in FIG. 14.
OPERATION OF FIGS. 12, 13 AND 14
As mentioned before, the flange alignment assembly 146 is
particularly constructed to align the bolt holes of the underwater
connecting end 144 with the bolt holes of the underwater connecting
end 140 as the constructed riser 12 is lowered into mating and
interconnecting engagement with the underwater pipeline 18.
In one form, the pin guide assemblies 504 and, more particularly,
each guide member 506 thereof can be positioned in an assembled
position on the flange 316 prior to the lowering of the underwater
pipeline 18 into the water. Each pin 520 can also be secured
through one of the bolt holes 500 of the slip ring 338 prior to the
lowering of the constructed riser 12 into the water.
In a preferred form, however, each pin guide assembly 504 and, more
particularly, each guide member 506 is disposed on the flange 316
and each pin 520 is disposed through one of the bolt holes 500 by
the diver immediately subsequent to the lowering of the constructed
riser 12 into mating and interconnecting engagement with the
underwater pipeline 18. Since each guide member 506 is removably
positioned on the flange 316 via the plugs 516, the pin guide
assemblies 504 can be easily, quickly and efficiently placed in an
assembled position by the diver. After each pin 520 is inserted
through one of the bolt holes 500 to an assembled position, the
C-shaped clamp 526 associated therewith is moved to a locking
position, shown in FIGS. 12 and 14, thereby securedly positioning
each pin 520 in an assembled position.
As the constructed riser 12 is lowered generally toward the
underwater pipeline 18, the pin 520 and, more particularly, the
cone-shaped end 524 thereof will be disposed generally within the
guide path 518 formed by the surfaces 512 and 514 of the two guide
members 506 of each pin guide assembly 504. Each guide side 512 and
514 will alternately and guidingly engage a portion of the pin 520
generally adjacent the lower end 524 thereof to guide the pin 520
into the particular bolt hole disposed between the two guide
members 506 of each pin guide assembly 504.
As each pin 520 is guidingly engaged by the sides 512 and 514 of
the two guide members 506, the slip ring 338 will be slidingly
rotated on the upper surface 329 of the flange 328 on the
underwater connecting end 144. The lower end 524 of the pin 520
will ultimately then be guided into the bolt hole 502 disposed
between the two guide members 506, thereby assuring an alignment
between the bolt holes 500 of the slip ring 338 and the bolt holes
502 through the flange 316.
After the constructed riser 12 has been lowered a sufficient
distance such that a portion of each pin 520 generally adjacent the
cone-shaped end 524 thereof has been disposed through the bolt hole
502 between the guide members 506, the constructed riser 12 will be
held stationary while the diver removes the guide members 506 from
their assembled position on the flange 316. The constructed riser
12 will then be lowered into a mating and interconnecting
relationship with respect to the underwater pipeline 18.
After the constructed riser 12 has been matingly and
interconnectingly positioned in the underwater pipeline 18, the
diver will then pivot each C-shaped clamp 526 to a detached
position (dashed-lines in FIG. 14), and remove each pin 520. The
diver can then effect the bolting interconnection between the
underwater connecting end 144 and the underwater connecting end
140.
It will be apparent to those skilled in the art, that the flange
alignment assembly, shown in FIGS. 12, 13 and 14, and described in
detail above, cooperates with the underwater connecting end 144 and
the underwater connecting end 140 so that the underwater
interconnection therebetween can be effected in a quicker, easier,
more efficient and safer manner.
EMBODIMENT OF FIG. 15
Diagrammatically shown in FIG. 15 is an alternate method and
apparatus for lowering the constructed riser 12 into a mating and
interconnecting engagement with the underwater pipeline 18, that is
alternate with respect to the utilization of the platform 16, as
shown in FIGS. 1, 2 and 3. As shown in FIG. 15, the constructed
riser 12 is lowered from a support member or, more particularly,
from a barge type marine support member 16 into an interconnecting
and mating engagement with the underwater pipeline 18.
In this embodiment of the invention, a predetermined length of the
underwater pipeline 18 is supported generally above the floor 20 of
the body of water 22 by a plurality of davits 550 which are
connected at predetermined positions to the underwater pipeline 18
by a plurality of cables 552.
As shown in FIG. 15, the guide coupling assembly 142 has been
secured in the underwater pipeline 18, generally through the
underwater connecting end 140 thereof. Since the guide coupling
assembly 142 provides a fluid seal to prevent water from entering
the pipeline 18 in a manner as described in detail before with
respect to FIG. 8, the buoyancy of the pipeline 18 is maintained.
The pipeline 18 can thus be more easily and efficiently supported
by the davits 550 above the floor 20 of the body of water 22.
In this embodiment of the invention, positioning assembly 554 is
utilized which is, more particularly, a movable crane assembly
having a cable 556 supported and controlled thereby which is
connected to the constructed riser 12 via the riser section
connector 124. The positioning assembly 554 also has a coupling
cable 558 which is controllingly supported thereon.
As shown in FIG. 15, a hook 560 is secured to one end of the
coupling cable 558. In this embodiment of the invention, the hook
560 is particularly constructed to be connected to the eyelet 406
of the guide coupling assembly 142. The positioning assembly 554
can thus be utilized to pull the guide coupling assembly 142
through the constructed riser 12, after the constructed riser 12
has been securedly interconnected to the underwater pipeline 18 via
the coupling cable 558.
As diagrammatically shown in FIG. 15, a hydraulic line assembly
562, including the necessary pump drive connectors and fluid
discharge lines, is also disposed through the constructed riser 12
and a portion thereof extends beyond the underwater connecting end
144 thereof. The hydraulic line assembly 562 is particularly
constructed to be connected to the submergable pump assembly 490 by
the diver, in a manner similar to that mentioned above with respect
to the operation of the guide coupling assembly 142 shown in FIG.
8.
In this embodiment of the invention, the positioning assembly 554
is utilized to lower the constructed riser 12 to a position
generally above the underwater connecting end 140 of the underwater
pipeline 18, and a diver will position the guide coupling assembly
142 in a position to be removed through the constructed riser 12,
in a manner as described before with respect to FIGS. 8 and 9, and
will connect the cable assembly 562 to the submergable pump
assembly 490. The constructed riser 12 will then be lowered by the
positioning assembly 554 into interconnecting engagement with the
underwater pipeline 18. Although the riser 12 is shown in FIG. 15
as being constructed of a single riser-section 14, more
particularly, of the one riser-section 14 having the connecting end
144, it will be apparent that the riser 12 could be constructed of
a plurality of riser-sections 14 interconnected in a manner as
described before with respect to FIGS. 1, 2 and 3. In this
instance, the riser support assembly 34 would also be supported on
the barge type support member 16 and utilized in cooperation with
the positioning assembly 554 to securedly interconnect the
riser-sections 14.
It will be apparent to those skilled in the art that, since the
underwater pipeline 18 is supported at various predetermined
positions by the davits 550 on the barge 16, that the movement of
the underwater pipeline 18 and the movement of the constructed
riser 12 will each be relative to the movement of the barge 16,
thereby reducing the relative movement occuring between the
constructed riser 12 and the underwater pipeline 18. The reduction
of relative movement between the constructed riser 12 and the
underwater pipeline 18 permits the constructed riser 12 to be
lowered into interconnecting and mating engagement with the
underwater pipeline 18 in a quicker and more efficient manner, and
in a manner wherein the possibility of damage occuring to the
underwater connecting end 144 of the constructed riser 12 and the
underwater connecting end 140 of the underwater pipeline 18 or to a
seal element disposed therebetween, is substantially reduced. After
the constructed riser 12 has been securedly connected to the
underwater pipeline 18, the riser 12 and the underwater pipeline 18
may then be moved by the barge support member 16 to a position
generally near a platform, such as the platform 16, shown in FIG.
1, for permanent installation.
EMBODIMENT OF FIG. 16
Diagrammatically shown in FIG. 16 is a portion of a modified
underwater pipeline 18a, which more particularly has a 90.degree.
turn segment 580 which is coupled to a pipeline segment 582 via a
slip coupling interconnection 584. The slip coupling
interconnection 584 is particularly constructed such that the
90.degree. turn segment 580 can be rotated with respect to the
pipeline segment 582, generally about the slip coupling
interconnection 584. In one form, the slip coupling interconnection
584 is constructed similar to the underwater connection between the
underwater connecting end 140 and the underwater connecting end
144, described in detail before with respect to FIGS. 12, 13 and
14.
The 90.degree. turn segment 580 includes the underwater connecting
end 140 connected to one end thereof. The guide coupling assembly
142 is positioned through the underwater connecting end 140 of the
underwater pipeline 18a, as shown in FIG. 16.
OPERATION OF FIG. 16
The apparatus shown in FIG. 16 is particularly constructed to
facilitate the moving of the underwater pipeline 18a into an
assembled position within an offshore platform 16 to matingly and
connectingly receive the constructed riser 12. More particularly,
the underwater pipeline 18a provides an apparatus wherein the
underwater pipeline 18a can be moved into an assembled position
within the offshore platform 16, as described above, wherein the
offshore platform 16 is constructed and the underwater pipeline 18a
is of such a size that the underwater pipeline 18a cannot be moved
or centrally disposed within the offshore platform 16 in a
completely assembled position.
In this embodiment of the invention, the 90.degree. turn segment
580 is rotated to a position wherein the 90.degree. turn segment
580 is disposed in a horizontal plane with respect to the floor 20
of the body of water 22, as indicated in dashed-lines in FIG. 16.
The underwater pipeline 18a is supported by the marine support
member or, more particularly, the barge 16 via a cable 556a, which
is secured on one end thereof to the underwater pipeline 18a and on
the opposite end thereof to the positioning assembly 554a. In this
position of the underwater pipeline 18a (as shown in dashed-lines
in FIG. 16), the barge 16 is then moved generally toward the
offshore platform 16 to a position wherein the 90.degree. turn
segment 580 of the underwater pipeline 18a is generally centrally
disposed within the offshore platform 16.
After the underwater pipeline 18a has been positioned within the
offshore platform 16, as described above, a diver can then rotate
the 90.degree. turn segment 580 to a position wherein a portion
thereof generally near the underwater connecting end 140 is
vertically disposed or, in other words, to a position wherein the
underwater connecting end 140 of the underwater pipeline 18a
generally faces the underwater connecting end 144 of the
constructed riser 12. The diver will then secure the slip coupling
584, thereby securing the 90.degree. turn segment 580 in an
assembled position within the offshore platform 16.
After the underwater pipeline 18a has been positioned within the
offshore platform 16, as described above, the constructed riser 12
can then be lowered into mating and interconnecting engagement with
the underwater pipeline 18a, in a manner similar to that described
in detail before.
It will be apparent from the foregoing, to those skilled in the
art, that the method and apparatus described in detail above
provides a safer and more efficient means for constructing an
underwater riser and connecting the constructed riser to an
underwater pipeline. The method and apparatus are also such that
the various interconnections, that is the interconnection between
the various riser-sections 14 and the interconnection between the
constructed riser 12 and the underwater pipeline are effected in a
safer and more efficient manner, and in a manner assuring a
sealingly secure interconnection.
Changes may be made in the construction and the arrangement of the
parts or the elements of the various embodiments, or in the steps
of the method as described herein without departing from the spirit
and scope of the invention as defined in the following claims.
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