WO2008099150A1 - Pipeline with outer weight member - Google Patents

Pipeline with outer weight member Download PDF

Info

Publication number
WO2008099150A1
WO2008099150A1 PCT/GB2008/000466 GB2008000466W WO2008099150A1 WO 2008099150 A1 WO2008099150 A1 WO 2008099150A1 GB 2008000466 W GB2008000466 W GB 2008000466W WO 2008099150 A1 WO2008099150 A1 WO 2008099150A1
Authority
WO
WIPO (PCT)
Prior art keywords
weight member
outer weight
pipe
pipe section
inner pipe
Prior art date
Application number
PCT/GB2008/000466
Other languages
French (fr)
Inventor
David Wilson
Original Assignee
Findlay, Jessie
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Findlay, Jessie filed Critical Findlay, Jessie
Publication of WO2008099150A1 publication Critical patent/WO2008099150A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
    • F16L1/12—Laying or reclaiming pipes on or under water
    • F16L1/20—Accessories therefor, e.g. floats, weights
    • F16L1/24—Floats; Weights
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
    • F16L9/153—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and concrete with or without reinforcement

Definitions

  • the present invention relates to a pipe section for a pipeline system, particularly, but not exclusively, to a pipe section for a sub-sea pipeline system and a method of assembling the same.
  • weights are added to the pipeline to ensure that it remains on the seabed and does not float.
  • weights are added to the pipeline to give them a buoyancy which is equivalent to the water depth in which they are situated, for example, pipelines traversing sub-sea canyons, or the like.
  • such pipelines are weighted by applying a predetermined amount of wet concrete over the various pipe sections.
  • the amount of concrete applied to the pipe sections depends upon the diameter of the pipeline, the water depth and the type of fluid flowing through it.
  • the concrete coated sections, once cured, are then ready for welding to other sections and laying.
  • a pipe section for a pipeline system comprising: an inner pipe; and an outer weight member, wherein the outer weight member is adapted to receive the inner pipe therein.
  • the outer weight member is manufactured from pre-cast concrete.
  • the pipe section has a gap between the inner pipe and the outer weight member.
  • the gap is filled with a filler material.
  • the filler material is an anti corrosive grout.
  • the inner pipe includes an anti-corrosive coating on its outer surface.
  • the outer weight member is manufactured from reinforced concrete.
  • the outer weight member is a cylindrical member.
  • the outer weight member is a concrete pipe.
  • the outer weight member is thermally insulated.
  • the outer weight member is thermally conductive.
  • the pipe section further comprises means for supporting the inner pipe within the outer weight member.
  • the means for supporting the inner pipe within the outer weight member includes a filler material located between the inner pipe and the outer weight member.
  • the filler material includes an anticorrosive grout material.
  • the pipe section further comprises means for attaching the inner pipe to the outer weight member.
  • the pipe section further comprises attachment means for attaching adjacent pipe sections to one another.
  • the attachment means is coated in concrete.
  • the pipe section further comprises a filler material between the pipe section and the attachment means.
  • the pipe section further comprises an anti-corrosive grout between the pipe section and the attachment means.
  • the attachment means comprises a collar.
  • the collar is concrete.
  • a pipeline system comprising at least two pipe sections according to the first aspect of the present invention.
  • a method of assembling a pipe section for a pipeline system comprising the steps of: providing an inner pipe; providing an outer weight member, wherein the outer weight member is adapted to receive the inner pipe therein; inserting the inner pipe into the outer weight member; and attaching the inner pipe to the outer weight member.
  • the gap is filled with an anti-corrosive grout material.
  • the method further comprises the step of applying an anti- corrosive material to the outer surface of the inner pipe prior to inserting the inner pipe into the outer weight member.
  • a method of assembling a pipeline system comprising the steps of: providing at least two pipe sections according to the first aspect of the present invention; providing attachment means for attaching the pipe sections to one another; and using the attachment means to attach the pipe sections to one another.
  • the attachment means comprises a collar.
  • the collar is concrete.
  • the method further comprises the step of applying an anti- corrosive grout between the collar and the pipe sections.
  • Fig. 1 is a perspective view of a pipe section for a pipeline system according to a first aspect of the present invention.
  • Fig. 2 is an end view of the pipe section of Fig. 1.
  • a pipe section 10 for a pipeline system comprises an inner pipe 12 and an outer weight member 14.
  • the inner pipe 12 is typically a steel pipe which may be used to transport fluids, such as gas in a sub-sea pipeline system.
  • the outer weight member 14 is a pre-fabricated member. In the embodiment illustrated here, the outer weight member 14 is a pre-cast concrete cylinder. The outer weight member 14 is adapted to receive the inner pipe 12 therein. The outer weight member 14 is adapted to receive substantially the entire length of the inner pipe 12 therein. The outer weight member 14 therefore acts as a sleeve which surrounds the outer surface of the inner pipe 12.
  • the outer weight member 14 and the inner pipe 12 are arranged such that a gap 16 exists therebetween.
  • the gap 16 is filled with an anti-corrosive grout 18,
  • the anti-corrosive grout 18 protects the outer surface of the inner pipe 12, the inner surface of the outer weight member 14 and the end portions of the pipe section 10 from corrosion.
  • the anti-corrosive grout 18 also acts as a filler material which supports the inner pipe 12 within the outer weight member 14.
  • the pipe section 10 is assembled by firstly, inserting the inner pipe 12 into the outer weight member 14, and then secondly, filling the gap 16 between the inner pipe 12 and outer weight member 14 with the anti-corrosive grout 18.
  • an anti-corrosive coating (not shown) may be applied to the outer surface of the inner pipe 12 prior to inserting into the outer weight member 14.
  • the outer weight member 14 provides the pipe section 10 with negative buoyancy, for example, when laid as part of a sub-sea pipeline system.
  • the amount of buoyancy required is dependent on the depth of water in which the pipeline is laid.
  • the depth could be the depth of the sea bed when the pipeline lies on the sea bed, or the depth of water in which the pipeline is situated when the pipeline is suspended over a sub- sea canyon, or the like.
  • the outer weight member 14 in this embodiment is a pre-cast concrete cylinder.
  • the weight of the outer weight member 14 and thus the amount of negative buoyancy provided to the pipe section 10, may be varied by controlling the size of the outer weight member 14, i.e. the volume of the concrete, or varying the density of the concrete, i.e. the mixture of the concrete.
  • Each pipe section 10 may be welded together in the conventional manner. Additionally, there may be provided a concrete collar (not shown) which attaches around the welded join.
  • the collar may be manufactured from concrete and may have an anti-corrosive material between the collar and the welded section of the pipe section 10 to prevent corrosion.
  • the welding of adjacent pipe sections 10 and the collar are examples of attachment means.
  • the pipe section 10 therefore obviates or mitigates the disadvantages of previous proposals by comprising a weight which may be applied quickly, cheaply and easily to the inner pipe 12.
  • the outer weight member 14 has been described above as being a pre- cast concrete cylinder, it should be appreciated that the outer weight member 14 could be of any suitable shape and suitable material which facilitates insertion of the inner pipe 12 therein.
  • the outer weight member 14 may be manufactured from metal, or any other suitable material which could provide negative buoyancy to the inner pipe 12.
  • the outer weight member 14 may be of any other suitable shape that permits the inner pipe 12 to be inserted therein.
  • the concrete cylinder may be manufactured from reinforced concrete.
  • the inner pipe 12 could have an interference fit to the inner surface of the outer weight member 14.
  • the inner pipe 12 may or may not have an anti-corrosive coating applied to its outer surface before insertion into the outer weight member 14.
  • the anti-corrosive grout 18 has been described above as acting as a support to the inner pipe 12 within the outer weight member 14, it should be appreciated that the inner pipe 12 may be attached to the outer weight member 14 by attachment means (not shown).
  • the attachment means may be mechanical fastening means.
  • the gap may or may not be filled with a filler material, such as anti-corrosive grout.
  • gap 16 has been described above as being filled with an anti-corrosive grout 18, it should be appreciated that the gap 16 may be filled with another suitable material which can support the inner pipe 12 and/or provide corrosion resistance thereto.
  • the outer weight member 14 may include thermal insulation (not shown) to prevent heat flow from the inner pipe 12 to the outer surface of the outer weight member 14.
  • This thermal insulation may be in the form of lagging around the outer weight member 14, or may be included in the material used to manufacture the outer weight member 14, i.e. included in the mixture of concrete before casting. Thermal insulation is important when the pipe section is laid in and around ice, e.g. in tundra regions and the like, as this prevents the ice from melting.
  • the outer weight member 14 may alternatively be thermally conductive to allow the flow of heat from the inner pipe 12 to the outer weight member 14.
  • the pipe section 10 has been described above as being used as part of a sub-sea pipeline system, it should be appreciated that it could be used as part of a pipeline system which is not sub-sea, e.g. river crossings, tundra regions etc. Also, the pipe section 10 could be used as part of a pipeline system which traverses sub-sea canyons, and the like.
  • pipe section 10 may be used to transport fluids of any type typically found in pipeline systems, e.g. gas, oil, etc.
  • outer weight member 14 has been illustrated and described above as receiving the full length of the inner pipe 12, it should be appreciated that the outer weight member 14 may receive less than the full length of the inner pipe 12, i.e. the inner pipe 12 may be longer than the length of the outer weight member 14.
  • the outer weight member 14 has been illustrated and described above as encompassing the entire outer circumferential surface of the inner pipe 12, it should be appreciated that the outer weight member 14 may be adapted such that it receives the inner pipe 12, but does not completely encompass the entire outer circumferential surface of the inner pipe 12. In such a case there would be a gap in the outer weight member 14 which runs the length thereof.

Abstract

A pipe section (10) for a pipeline system comprising an inner pipe (12) and an outer weight member (14). The outer weight member (14) being adapted to receive the inner pipe (12) therein. The outer weight member (14) providing negative buoyancy to the inner pipe (12).

Description

PIPELINE WITH OUTER WEIGHT MEMBER
The present invention relates to a pipe section for a pipeline system, particularly, but not exclusively, to a pipe section for a sub-sea pipeline system and a method of assembling the same.
Conventional sub-sea pipeline systems, such as gas pipelines, are required to be weighted to provide negative buoyancy. For example, weights are added to the pipeline to ensure that it remains on the seabed and does not float. Alternatively, weights are added to the pipeline to give them a buoyancy which is equivalent to the water depth in which they are situated, for example, pipelines traversing sub-sea canyons, or the like.
Typically, such pipelines are weighted by applying a predetermined amount of wet concrete over the various pipe sections. The amount of concrete applied to the pipe sections depends upon the diameter of the pipeline, the water depth and the type of fluid flowing through it. The concrete coated sections, once cured, are then ready for welding to other sections and laying.
Whilst applying a wet concrete coating to pipe sections produces the required negative buoyancy, it is a time consuming, expensive and difficult process.
It is a object of the present invention to provide a pipe section for a pipeline system and a method of assembling the same which obviates or mitigates one or more of the disadvantages referred to above. According to a first aspect of the present invention there is provided a pipe section for a pipeline system comprising: an inner pipe; and an outer weight member, wherein the outer weight member is adapted to receive the inner pipe therein.
Preferably, the outer weight member is manufactured from pre-cast concrete.
Preferably, the pipe section has a gap between the inner pipe and the outer weight member.
Preferably, the gap is filled with a filler material.
Preferably, the filler material is an anti corrosive grout.
Preferably, the inner pipe includes an anti-corrosive coating on its outer surface.
Preferably, the outer weight member is manufactured from reinforced concrete.
Preferably, the outer weight member is a cylindrical member.
Preferably, the outer weight member is a concrete pipe.
Preferably, the outer weight member is thermally insulated. Alternatively, the outer weight member is thermally conductive. Preferably, the pipe section further comprises means for supporting the inner pipe within the outer weight member.
Preferably, the means for supporting the inner pipe within the outer weight member includes a filler material located between the inner pipe and the outer weight member.
Preferably, the filler material includes an anticorrosive grout material.
Preferably, the pipe section further comprises means for attaching the inner pipe to the outer weight member.
Preferably, the pipe section further comprises attachment means for attaching adjacent pipe sections to one another.
Preferably, the attachment means is coated in concrete.
Preferably, the pipe section further comprises a filler material between the pipe section and the attachment means.
Preferably, the pipe section further comprises an anti-corrosive grout between the pipe section and the attachment means.
Preferably, the attachment means comprises a collar.
Preferably, the collar is concrete.
According to a second aspect of the present invention there is provided a pipeline system comprising at least two pipe sections according to the first aspect of the present invention. According to a third aspect of the present invention there is provided a method of assembling a pipe section for a pipeline system comprising the steps of: providing an inner pipe; providing an outer weight member, wherein the outer weight member is adapted to receive the inner pipe therein; inserting the inner pipe into the outer weight member; and attaching the inner pipe to the outer weight member.
Preferably, there is a gap between the inner pipe and the outer weight member, and the gap is filled with an anti-corrosive grout material.
Preferably, the method further comprises the step of applying an anti- corrosive material to the outer surface of the inner pipe prior to inserting the inner pipe into the outer weight member.
According to a fourth aspect of the present invention there is provided a method of assembling a pipeline system comprising the steps of: providing at least two pipe sections according to the first aspect of the present invention; providing attachment means for attaching the pipe sections to one another; and using the attachment means to attach the pipe sections to one another.
Preferably, the attachment means comprises a collar.
Preferably, the collar is concrete. Preferably, the method further comprises the step of applying an anti- corrosive grout between the collar and the pipe sections.
An embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:-
Fig. 1 is a perspective view of a pipe section for a pipeline system according to a first aspect of the present invention; and
Fig. 2 is an end view of the pipe section of Fig. 1.
With reference to Figs. 1 and 2, a pipe section 10 for a pipeline system comprises an inner pipe 12 and an outer weight member 14.
The inner pipe 12 is typically a steel pipe which may be used to transport fluids, such as gas in a sub-sea pipeline system.
The outer weight member 14 is a pre-fabricated member. In the embodiment illustrated here, the outer weight member 14 is a pre-cast concrete cylinder. The outer weight member 14 is adapted to receive the inner pipe 12 therein. The outer weight member 14 is adapted to receive substantially the entire length of the inner pipe 12 therein. The outer weight member 14 therefore acts as a sleeve which surrounds the outer surface of the inner pipe 12.
The outer weight member 14 and the inner pipe 12 are arranged such that a gap 16 exists therebetween. The gap 16 is filled with an anti-corrosive grout 18, The anti-corrosive grout 18 protects the outer surface of the inner pipe 12, the inner surface of the outer weight member 14 and the end portions of the pipe section 10 from corrosion. The anti-corrosive grout 18 also acts as a filler material which supports the inner pipe 12 within the outer weight member 14.
The pipe section 10 is assembled by firstly, inserting the inner pipe 12 into the outer weight member 14, and then secondly, filling the gap 16 between the inner pipe 12 and outer weight member 14 with the anti-corrosive grout 18.
Additionally, an anti-corrosive coating (not shown) may be applied to the outer surface of the inner pipe 12 prior to inserting into the outer weight member 14.
The outer weight member 14 provides the pipe section 10 with negative buoyancy, for example, when laid as part of a sub-sea pipeline system. The amount of buoyancy required is dependent on the depth of water in which the pipeline is laid. For example, the depth could be the depth of the sea bed when the pipeline lies on the sea bed, or the depth of water in which the pipeline is situated when the pipeline is suspended over a sub- sea canyon, or the like.
As described above, the outer weight member 14 in this embodiment is a pre-cast concrete cylinder. The weight of the outer weight member 14 and thus the amount of negative buoyancy provided to the pipe section 10, may be varied by controlling the size of the outer weight member 14, i.e. the volume of the concrete, or varying the density of the concrete, i.e. the mixture of the concrete.
Using a plurality of pipe sections 10, as described above, it is possible to construct a pipeline system. Each pipe section 10 may be welded together in the conventional manner. Additionally, there may be provided a concrete collar (not shown) which attaches around the welded join. The collar may be manufactured from concrete and may have an anti-corrosive material between the collar and the welded section of the pipe section 10 to prevent corrosion. The welding of adjacent pipe sections 10 and the collar are examples of attachment means.
The pipe section 10 therefore obviates or mitigates the disadvantages of previous proposals by comprising a weight which may be applied quickly, cheaply and easily to the inner pipe 12.
Modifications and improvements may be made to the above without departing from the scope of the present invention. For example, although the outer weight member 14 has been described above as being a pre- cast concrete cylinder, it should be appreciated that the outer weight member 14 could be of any suitable shape and suitable material which facilitates insertion of the inner pipe 12 therein. For example, the outer weight member 14 may be manufactured from metal, or any other suitable material which could provide negative buoyancy to the inner pipe 12. Also, the outer weight member 14 may be of any other suitable shape that permits the inner pipe 12 to be inserted therein.
Also, the concrete cylinder may be manufactured from reinforced concrete.
Furthermore, although there is a gap 16 described above between the inner pipe 12 and the outer weight member 14, it should be appreciated that the inner pipe 12 could have an interference fit to the inner surface of the outer weight member 14. In this case the inner pipe 12 may or may not have an anti-corrosive coating applied to its outer surface before insertion into the outer weight member 14.
Also, although the anti-corrosive grout 18 has been described above as acting as a support to the inner pipe 12 within the outer weight member 14, it should be appreciated that the inner pipe 12 may be attached to the outer weight member 14 by attachment means (not shown). The attachment means may be mechanical fastening means. In this case, the gap may or may not be filled with a filler material, such as anti-corrosive grout.
Furthermore, although the gap 16 has been described above as being filled with an anti-corrosive grout 18, it should be appreciated that the gap 16 may be filled with another suitable material which can support the inner pipe 12 and/or provide corrosion resistance thereto.
Also, it should be appreciated that the outer weight member 14 may include thermal insulation (not shown) to prevent heat flow from the inner pipe 12 to the outer surface of the outer weight member 14. This thermal insulation may be in the form of lagging around the outer weight member 14, or may be included in the material used to manufacture the outer weight member 14, i.e. included in the mixture of concrete before casting. Thermal insulation is important when the pipe section is laid in and around ice, e.g. in tundra regions and the like, as this prevents the ice from melting.
Furthermore, it should also be appreciated that the outer weight member 14 may alternatively be thermally conductive to allow the flow of heat from the inner pipe 12 to the outer weight member 14. Also, although the pipe section 10 has been described above as being used as part of a sub-sea pipeline system, it should be appreciated that it could be used as part of a pipeline system which is not sub-sea, e.g. river crossings, tundra regions etc. Also, the pipe section 10 could be used as part of a pipeline system which traverses sub-sea canyons, and the like.
Furthermore, the pipe section 10 may be used to transport fluids of any type typically found in pipeline systems, e.g. gas, oil, etc.
Also, although the outer weight member 14 has been illustrated and described above as receiving the full length of the inner pipe 12, it should be appreciated that the outer weight member 14 may receive less than the full length of the inner pipe 12, i.e. the inner pipe 12 may be longer than the length of the outer weight member 14. Similarly, although the outer weight member 14 has been illustrated and described above as encompassing the entire outer circumferential surface of the inner pipe 12, it should be appreciated that the outer weight member 14 may be adapted such that it receives the inner pipe 12, but does not completely encompass the entire outer circumferential surface of the inner pipe 12. In such a case there would be a gap in the outer weight member 14 which runs the length thereof.

Claims

Claims
1. A pipe section for a pipeline system comprising: an inner pipe; and an outer weight member, wherein the outer weight member is adapted to receive the inner pipe therein.
2. A pipe section according to claim 1 , wherein the outer weight member is pre-fabricated.
3. A pipe section according to claim 1 or claim 2, wherein the outer weight member is adapted to receive substantially the entire length of the inner pipe therein.
4. A pipe section according to claim 2 or claim 3, wherein the outer weight member is manufactured from pre-cast concrete.
5. A pipe section according to any preceding claim, wherein the pipe section has a gap between the inner pipe and the outer weight member.
6. A pipe section according to claim 5, wherein the gap is filled with a filler material.
7. A pipe section according to claim 6, wherein the filler material is an anti corrosive grout.
8. A pipe section according to any preceding claim, wherein the pipe section further comprises means for supporting the inner pipe within the outer weight member.
9. A pipe section according to claim 8, wherein filler material supports the inner pipe within the outer weight member.
10. A pipe section according to any preceding claim, wherein the pipe section further comprises means for attaching the inner pipe to the outer weight member.
11. A pipe section according any preceding claim, wherein the pipe section further comprises attachment means for attaching adjacent pipe sections to one another.
12. A pipeline system comprising at least two pipe sections according to any of claims 1 to 11.
13. A method of assembling a pipe section for a pipeline system comprising the steps of: providing an inner pipe; providing an outer weight member adapted to receive the inner pipe therein; inserting the inner pipe into the outer weight member; and attaching the inner pipe to the outer weight member.
14. A method of assembling a pipe section as claimed in claim 13, wherein the inner pipe and the outer weight member are arranged such that there is a gap therebetween and the method comprises the further step of filling the gap with an anti-corrosive grout material.
PCT/GB2008/000466 2007-02-12 2008-02-11 Pipeline with outer weight member WO2008099150A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0702658.6 2007-02-12
GB0702658A GB0702658D0 (en) 2007-02-12 2007-02-12 Improvements in or relating to pipelines

Publications (1)

Publication Number Publication Date
WO2008099150A1 true WO2008099150A1 (en) 2008-08-21

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Family Applications (1)

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PCT/GB2008/000466 WO2008099150A1 (en) 2007-02-12 2008-02-11 Pipeline with outer weight member

Country Status (2)

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GB (1) GB0702658D0 (en)
WO (1) WO2008099150A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012017250A1 (en) * 2010-08-04 2012-02-09 Flexlife Limited Corrosion protection of pipes suspended in seawater
CN102840395A (en) * 2012-08-28 2012-12-26 中国海洋石油总公司 Dual-layer heat-preserving weight-balancing submarine pipeline
EP2728237A3 (en) * 2012-10-30 2016-07-27 Salzgitter Mannesmann Line Pipe GmbH Jacketed remote refrigeration line pipe
AT17850U1 (en) * 2022-02-14 2023-05-15 Hallingplast As Tube and method of adjusting the weight of a tube

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1420945A (en) * 1972-09-15 1976-01-14 West J B Submarine piping sections
US3935632A (en) * 1973-07-02 1976-02-03 Continental Oil Company Method of preparing an insulated negative buoyancy flow line
DE2630459A1 (en) * 1976-07-07 1978-01-12 Kwf Ges Fuer Rohrisolierungen Underground hot water pipe with bitumen-bonded insulation - contg. high proportion of perlite and foam glass
US4120168A (en) * 1975-05-30 1978-10-17 Compagnie Generale Pour Les Developpements Operationnels Des Richesses Sous-Marines "C.G. Doris" Apparatus for laying a pipeline in a body of water
GB2144513A (en) * 1983-08-05 1985-03-06 Tate Pipe Lining Processes Lim Anti-buoyant pipe
GB2247507A (en) * 1990-08-30 1992-03-04 Seamark Systems Subsea pipe protection and insulation
WO1997033122A1 (en) * 1996-03-06 1997-09-12 Seamark Systems Limited Pipeline insulation

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1420945A (en) * 1972-09-15 1976-01-14 West J B Submarine piping sections
US3935632A (en) * 1973-07-02 1976-02-03 Continental Oil Company Method of preparing an insulated negative buoyancy flow line
US4120168A (en) * 1975-05-30 1978-10-17 Compagnie Generale Pour Les Developpements Operationnels Des Richesses Sous-Marines "C.G. Doris" Apparatus for laying a pipeline in a body of water
DE2630459A1 (en) * 1976-07-07 1978-01-12 Kwf Ges Fuer Rohrisolierungen Underground hot water pipe with bitumen-bonded insulation - contg. high proportion of perlite and foam glass
GB2144513A (en) * 1983-08-05 1985-03-06 Tate Pipe Lining Processes Lim Anti-buoyant pipe
GB2247507A (en) * 1990-08-30 1992-03-04 Seamark Systems Subsea pipe protection and insulation
WO1997033122A1 (en) * 1996-03-06 1997-09-12 Seamark Systems Limited Pipeline insulation

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012017250A1 (en) * 2010-08-04 2012-02-09 Flexlife Limited Corrosion protection of pipes suspended in seawater
CN102840395A (en) * 2012-08-28 2012-12-26 中国海洋石油总公司 Dual-layer heat-preserving weight-balancing submarine pipeline
EP2728237A3 (en) * 2012-10-30 2016-07-27 Salzgitter Mannesmann Line Pipe GmbH Jacketed remote refrigeration line pipe
AT17850U1 (en) * 2022-02-14 2023-05-15 Hallingplast As Tube and method of adjusting the weight of a tube

Also Published As

Publication number Publication date
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