WO2002025160A1 - Arrangement for pipelines - Google Patents
Arrangement for pipelines Download PDFInfo
- Publication number
- WO2002025160A1 WO2002025160A1 PCT/NO2001/000378 NO0100378W WO0225160A1 WO 2002025160 A1 WO2002025160 A1 WO 2002025160A1 NO 0100378 W NO0100378 W NO 0100378W WO 0225160 A1 WO0225160 A1 WO 0225160A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- lightweight concrete
- mantel layer
- mantel
- concrete
- layer
- Prior art date
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
- F16L59/00—Thermal insulation in general
- F16L59/14—Arrangements for the insulation of pipes or pipe systems
- F16L59/143—Pre-insulated pipes
-
- 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
- F16L9/02—Rigid pipes of metal
- F16L9/04—Reinforced pipes
Definitions
- the present invention relates to deepwater pipelines.
- Pipe-laying barges of the S-lay and J-lay type that are currently available have sufficient tensioner capacity to lay down pipelines at great depths down to about 1000 to 2000 meters.
- the specific depth depends to a great extent on the diameter, wall thickness and weight of the pipeline that is to be laid.
- it is necessary to reduce weight, add buoyancy or both.
- the alternative is to increase vessel sizes and tensioner capacity, but this is not considered commercially viable.
- Another aspect of deepwater production is the high pressure differential between the surface and the seabed.
- the hydrostatic pressure exerted on the production fluid at this depth may under some circumstances contribute to the formation of hydrates .
- the detrimental effect of the increased pressure may be offset by supplementary thermal insulation.
- different kinds of insulation materials are in use, i.e. insulating syntactic foam or rubber, for pipelines at great depths . However, these materials have so f r proven to be expensive.
- Fig. 1 shows a general overview of one possible pipe-laying technique
- Fig. 2 shows a schematic section of a preferred embodiment according to the invention.
- Fig. 1 shows a general overview of a pipe-laying technique of the S-lay type.
- the free-span portion 1 of the pipeline 2 has to be carried by the pipe-laying barge 3.
- the pipeline is held in tension by the barge 3.
- the tension is exerted by tension equipment on board of the barge and is mainly dependent on friction forces between the tension equipment and the pipeline 2.
- the pipeline 2 may be exposed to such high clamping forces that it may be crushed and/or damaged.
- Fig. 2 shows a schematic view of one embodiment according to the present invention.
- a lightweight concrete mantel layer 5 around the internal thick walled pipeline 6 may provide both buoyancy and insu- lation to a pipeline 2 that is to be laid down in great water depths .
- lightweight concrete has a modest strength.
- it is provided with an ex- ternal thin-walled tube or skin 7, preferably of metal but possibly of any other suitable material, which reinforces the lightweight concrete mantel layer 5 against the pressure applied from the tensioning equipment and hydrostatic pressure.
- Such tri-axial confinement causes a two to three- fold increases of the compressive stress that can be sustained.
- the invention also includes the use of high strength concrete technology pioneered in Norway.
- the technology of producing high strength concrete involves the use of very carefully graded particles which pack together in such a way that contact stresses between particles become very uniform. This gives a several-fold increase of compressive strength.
- the external hydrostatic pressure which can be supported is a primary consideration. Sufficient compressive strength of the concrete is one important feature.
- the second aspect is to prevent the unsta- ble collapse of the pipe under external pressure.
- the high strength lightweight concrete according to this invention will develop extensive composite action between the two pipes, which will vastly increase the collapse strength. This makes it possible to reduce the wall thickness of the steel pipeline itself considerably.
- lightweight concrete also tends to absorb water. In order to achieve the most favorable heat conductivity rates, it needs to be kept dry.
- the external thin- walled tube or skin 7 therefore also prevents moisture from penetrating into the concrete mantel layer 5 and thereby contributes to the insulating capability of the concrete mantel layer 5.
- the external thin walled tube or skin 7 may act as for work for casting of the concrete an- tel layer 5.
- the internal thick walled pipeline 6 is centrally positioned within the external thin walled tube or skin 7, whereupon lightweight concrete is poured into the annulus formed between the internal thick walled pipeline and the external thin walled tube or skin 5.
- the lightweight concrete mantel layer 5 is thereafter allowed to settle and cure.
- the ends of the annulus may finally be covered by suitable, annually shaped covers or by other suitable means.
- the lightweight aggregate concrete provides permanent buoyancy and insulation.
- the external carrier pipe is supported by the concrete which has a tenfold greater compressive strength than the aggregate would have as particles with or without a cement past or other form of adhesive coating. This makes it possible to use a very thin walled carrier pipe .
- the external carrier pipe prevents ingress of water that otherwise would reduce the buoyancy and increase the thermal conductivity of the concrete.
- Pipe-laying with concrete weight coating is a well- established technique.
- the techniques used according to the present invention will include many of the same elements, but the technical challenges will differ. Developing sufficient strength of the external thin walled tube or skin 7 in combination with the sufficient crushing strength of the concrete mantel layer 5 must be balanced against obtaining the desired heat conductivity or density. It is envisaged that double joints with lightweight concrete surrounded by an outer steel tube or skin 7 will be supplied to a conven- tional lay barge from an onshore facility. Field jointing techniques will be similar to weight coated pipelines .
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2001290364A AU2001290364A1 (en) | 2000-09-25 | 2001-09-17 | Arrangement for pipelines |
CA002419085A CA2419085A1 (en) | 2000-09-25 | 2001-09-17 | Arrangement for pipelines |
EP01970363A EP1320703A1 (en) | 2000-09-25 | 2001-09-17 | Arrangement for pipelines |
BR0114095-7A BR0114095A (en) | 2000-09-25 | 2001-09-17 | Pipe fittings |
NO20031361A NO20031361D0 (en) | 2000-09-25 | 2003-03-25 | Device for pipelines |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO20004783 | 2000-09-25 | ||
NO20004783A NO20004783D0 (en) | 2000-09-25 | 2000-09-25 | Device by pipeline |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002025160A1 true WO2002025160A1 (en) | 2002-03-28 |
Family
ID=19911607
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/NO2001/000378 WO2002025160A1 (en) | 2000-09-25 | 2001-09-17 | Arrangement for pipelines |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1320703A1 (en) |
AU (1) | AU2001290364A1 (en) |
BR (1) | BR0114095A (en) |
CA (1) | CA2419085A1 (en) |
NO (1) | NO20004783D0 (en) |
WO (1) | WO2002025160A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110259901A1 (en) * | 2008-10-28 | 2011-10-27 | Statoil Petroleum As | Subsea gravity separator |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3860039A (en) * | 1972-05-26 | 1975-01-14 | British Petroleum Co | Pipelines |
GB2084284A (en) * | 1980-09-22 | 1982-04-07 | Showa Denki Kogyo Co Ltd | Heated pipeline |
US4393901A (en) * | 1980-09-25 | 1983-07-19 | Minnesota Mining And Manufacturing Company | Low-permeability hollow spheres and pipe filled with the spheres for temporary weight reduction |
GB2269876A (en) * | 1992-08-12 | 1994-02-23 | Terence Jeffrey Corbishley | Hydrotherm-thermal insulation for submarine pipelines and equipment |
GB2326687A (en) * | 1997-06-23 | 1998-12-30 | British Steel Plc | Double walled pipe structure |
US6092557A (en) * | 1994-08-29 | 2000-07-25 | Sumner; Glen R. | Offshore pipeline with waterproof thermal insulation |
-
2000
- 2000-09-25 NO NO20004783A patent/NO20004783D0/en unknown
-
2001
- 2001-09-17 EP EP01970363A patent/EP1320703A1/en not_active Withdrawn
- 2001-09-17 BR BR0114095-7A patent/BR0114095A/en not_active Application Discontinuation
- 2001-09-17 AU AU2001290364A patent/AU2001290364A1/en not_active Abandoned
- 2001-09-17 WO PCT/NO2001/000378 patent/WO2002025160A1/en not_active Application Discontinuation
- 2001-09-17 CA CA002419085A patent/CA2419085A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3860039A (en) * | 1972-05-26 | 1975-01-14 | British Petroleum Co | Pipelines |
GB2084284A (en) * | 1980-09-22 | 1982-04-07 | Showa Denki Kogyo Co Ltd | Heated pipeline |
US4393901A (en) * | 1980-09-25 | 1983-07-19 | Minnesota Mining And Manufacturing Company | Low-permeability hollow spheres and pipe filled with the spheres for temporary weight reduction |
GB2269876A (en) * | 1992-08-12 | 1994-02-23 | Terence Jeffrey Corbishley | Hydrotherm-thermal insulation for submarine pipelines and equipment |
US6092557A (en) * | 1994-08-29 | 2000-07-25 | Sumner; Glen R. | Offshore pipeline with waterproof thermal insulation |
GB2326687A (en) * | 1997-06-23 | 1998-12-30 | British Steel Plc | Double walled pipe structure |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110259901A1 (en) * | 2008-10-28 | 2011-10-27 | Statoil Petroleum As | Subsea gravity separator |
US8597506B2 (en) * | 2008-10-28 | 2013-12-03 | Statoil Petroleum As | Subsea gravity separator |
DK178669B1 (en) * | 2008-10-28 | 2016-10-24 | Statoil Petroleum As | Underwater gravity separator |
Also Published As
Publication number | Publication date |
---|---|
NO20004783D0 (en) | 2000-09-25 |
BR0114095A (en) | 2003-07-22 |
CA2419085A1 (en) | 2002-03-28 |
AU2001290364A1 (en) | 2002-04-02 |
EP1320703A1 (en) | 2003-06-25 |
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