WO2000008368A1 - Ventilation de pipelines a revetement plastique - Google Patents

Ventilation de pipelines a revetement plastique Download PDF

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Publication number
WO2000008368A1
WO2000008368A1 PCT/GB1999/002613 GB9902613W WO0008368A1 WO 2000008368 A1 WO2000008368 A1 WO 2000008368A1 GB 9902613 W GB9902613 W GB 9902613W WO 0008368 A1 WO0008368 A1 WO 0008368A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipeline
plastics
venting
lined pipeline
plastics lined
Prior art date
Application number
PCT/GB1999/002613
Other languages
English (en)
Inventor
Stuart Mcintyre
Original Assignee
Boreas Consultants Limited
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 Boreas Consultants Limited filed Critical Boreas Consultants Limited
Priority to AU54302/99A priority Critical patent/AU5430299A/en
Publication of WO2000008368A1 publication Critical patent/WO2000008368A1/fr

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
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/07—Arrangement or mounting of devices, e.g. valves, for venting or aerating or draining
    • 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
    • F16L9/12—Rigid pipes of plastics with or without reinforcement
    • F16L9/133—Rigid pipes of plastics with or without reinforcement the walls consisting of two layers
    • 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
    • F16L9/147—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and plastics with or without reinforcement
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/46—Processes or apparatus adapted for installing or repairing optical fibres or optical cables
    • G02B6/50—Underground or underwater installation; Installation through tubing, conduits or ducts
    • G02B6/502—Installation methods in fluid conducts, e.g. pipelines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/03—Dealing with losses
    • F17C2260/035—Dealing with losses of fluid
    • F17C2260/037—Handling leaked fluid

Definitions

  • This invention relates to the venting of plastic lined pipelines, especially but not exclusively those pipelines used for transporting hydrocarbon fluids.
  • the first option is to use high-grade corrosion resistant material for pipeline construction.
  • Such materials are very expensive, up to ten times the cost of Carbon Steel that is used in less exacting circumstances.
  • the cost premium means that this option is not practical where any significant length of pipeline is involved.
  • the second option that of providing a cheap corrosion resistant inner surface on a carbon steel pipeline, offers major cost benefits.
  • Various plastics material liners have previously been proposed and are commonly used in process plant pipework. However, the materials used in these systems are not suitable for petrochemical pipelines as they are generally supplied in short lengths that are flanged rather than welded and operate at near ambient temperatures and low pressures.
  • Plastics lining of non-hydrocarbon pipelines is used in certain applications such as high-pressure seawater injection pipelines.
  • the technique used for lining such pipelines is to weld up lengths of about one kilometre and then to pull a continuous plastics material pipe into the steel pipe to form an inner lining.
  • the process is for the plastics material pipe to be swaged down or squeezed between rollers to make it smaller and temporarily a loose fit. Installation is thus simplified and after some time the plastics material relaxes, or is expanded, to be a close fit with the steel pipeline.
  • the fit between the plastics liner and the steel pipeline is close but there is no physical bond between the two.
  • a small micro-annulus exists which is particularly evident at weld beads where there is greater stand off.
  • the technique described is well established and particularly suited to systems, such as high-pressure water injection pipelines, with no gas content.
  • plastics liners for hydrocarbons.
  • the plastics material is slightly permeable to this and certain other materials.
  • the plastics liner allows the smaller gas molecules to permeate out of the fluid stream and the micro-annulus becomes pressurised over time.
  • the gas pressure in the annulus can cause the liner to collapse. In such circumstances, it is highly probable that the liner will not re-inflate without damage .
  • Possible solutions include strengthening the liner so that it is less susceptible to collapse or to make the liner impermeable by including a thin metallic layer within the plastics liner. Both these solutions however are likely to require the production of special liner materials and/or the use of special installation techniques. Additionally the plastics material degrades over time and absorbs water so that the likelihood of collapse when the pipeline is depressurised becomes difficult to predict.
  • apparatus for use in venting plastics lined pipeline comprising a vent assembly for through fitment in a pipeline wall and having means for resisting deformation of the plastics lining into the vent assembly.
  • the means for resisting deformation of the plastics lining may for example be by virtue of the provision of a vent hole of small diameter relative to the elasticity of the plastics material or preferably, a gas permeable barrier. More preferably, said gas permeable barrier is provided at an inner end of the vent assembly.
  • Said gas permeable barrier may for example be a sintered metal, a sintered wire mesh, a ceramic material or a stainless steel wire mesh.
  • the vent assembly includes non-return valve means .
  • the non-return valve means may for example comprise a spring biased ball valve assembly, or resilient material closure.
  • means are provided for allowing gas flow between the plastics lining and the pipeline.
  • a spacer element such as a wire, cable or wire mesh between the lining and the pipeline.
  • gas drainage channels may be provided on the inner surface of the pipeline.
  • Fig. 1 is a schematic cross-sectional view of a first embodiment of an annulus vent for use in apparatus of the present invention
  • Fig. 2 is a cross-sectional end view of a segment of plastics lined pipeline in accordance with the present invention
  • Fig. 3 is a cross-sectional view of an alternative embodiment of an annulus vent for use in apparatus of the present invention.
  • Fig. 4 is a cross-sectional view of a further alternative embodiment of an annulus vent for use in apparatus of the present invention.
  • Fig. 5 is a schematic cross-sectional view of a first arrangement of the application of a vent to an insulated pipeline
  • Fig. 6 is a schematic cross-sectional view of a second arrangement of the application of a vent to an insulated pipeline
  • vent assembly 1 for venting of plastics lined pipelines is shown generally at 1.
  • the vent assembly 1 is inserted through the wall of a steel pipeline 2. This can be done at any convenient time during manufacture but before welding together of long lengths.
  • the spacing of vents may be as frequent as every 12 or 13m (to suit the standard pipe length) up to several hundred metres apart (one vent in every ten or twenty lengths) as appropriate to the circumstances.
  • Plastics liner installation follows the known procedures described above.
  • the vent assembly 1 is made up of a main body 3 having a small through-hole 4 forming a gas passage.
  • a porous element 5 fits in a recess 6 in the main body 3 and a non return valve 7 comprising a ball 8 and spring 9 is held in place by a retaining cap 10.
  • the valve assembly 1 fits flush with the inner surface 11 of the pipeline 2 so that it does not present an obstruction to the plastics liner 12.
  • a micro annulus 13 exists between the pipeline 2 and the liner 12.
  • the pipeline 2 is typically used for hydrocarbons, which will generally result in high temperatures and pressures in the pipeline 2.
  • the plastics liner 12 is permeable to the gas content in the hydrocarbon to some extent. Consequently a small quantity of gas finds its way into the micro annulus 13 from where it can escape through a nearby vent assembly 1.
  • a small spacer can be provided to ensure a gap exists between the pipeline 2 and the liner 12.
  • the spacer can be glued or taped to the liner 12 as it is inserted in the pipeline 2.
  • a number of power, signal and other cables 14 are inserted between the pipeline 2 and the liner 12 by fixing them to the liner 12 during installation.
  • filler materials can be included to prevent excessive curvature of the liner 12 that might cause cracking.
  • Other means of providing a small gap are also envisaged such as the use of fine wire mesh.
  • gas flow passages can be provided by the provision of small scores or grooves on the inner surface 11 of the pipeline 2. Typically, these grooves would be in a spiral pattern.
  • the cable system which provides the channels 15 might be a fibre optic sensor system. These systems have previously been deployed downhole and they are capable of measuring temperature and pressure along every metre of their length. In the present application such a system can monitor temperature and pressure as described and also function as a leak detection system in the event of liner rupture.
  • the porous element 5 on the vent assembly 1 provides a barrier against the liner 12 deforming under pressure and clogging the vent hole.
  • Various materials are envisaged for the porous element 5, for example sintered metal, sintered wire mesh or porcelain/ceramic type material.
  • the porous element can be made from various plastics and composite materials such as PEEK (Poly Ether Ether Ketone) alloyed with Teflon (PAT) .
  • PEEK Poly Ether Ether Ketone
  • Teflon Teflon
  • non-return valve 7 ensures that the liner 12 does not collapse as a result of hydrostatic pressure during offshore installation.
  • the non- return valve may be omitted to simplify the construction.
  • vent assembly 1 The practical effect of the vent assembly 1 is to ensure that the micro annulus is always at or near to ambient pressure. Thus the risk of collapse of the liner 12 when pipeline pressure is reduced is minimised.
  • a vent assembly 100 comprises a threaded plug 101 which is screwed into a partially threaded throughole 102 in the pipeline 2.
  • the vent assembly has a small throughhole 103 forming a gas passage and a porous element 104.
  • the porous element may either sit flush with the pipeline inner surface 11 or form a slight protrusion, as in this example.
  • the vent assembly 1 can be formed from a range of plastics or composite materials, in the example illustrated this is PEEK material. The selection of this material is primarily dictated by the need for the assembly to be resistant to corrosion and blockage in the harsh environment typically found in pipelines.
  • non return valve means are effectively provided by a rubber, or similar material, band 105 which fits around the pipeline 2 to close off the vent assembly 100.
  • band 105 which fits around the pipeline 2 to close off the vent assembly 100.
  • This particular type of vent assembly also has the advantage that it is fitted to the pipeline externally. Accordingly it may be fitted to a pipeline either under construction or as a retrofit to already lined pipelines, perhaps those with defective venting already in place. Additionally it may be fitted to pipelines which are to be lined as part of a rehabilitation process.
  • the Fig 4 assembly is similar to the Fig 3 embodiment but additionally shows further alternatives.
  • the threaded plug 101 forming the vent assembly 100 fits into a throughhole 102 threaded completely through the pipeline wall.
  • Valve means are provided in the form of a vapour permeable water barrier member (for example Goretex) 106.
  • FIGs 5 and 6 illustrate the application of the vent assembly to insulated pipelines.
  • the vent assembly is provided with an extension tube 107 either as a separate component or as an integral part of the vent assembly.
  • the purpose of the extension is to ensure that any escaping gas is discharged outside the insulating layer.
  • the vent is positioned beyond the extent of any factory coated insulation 108 and is surrounded by site applied insulation 109.
  • the factory insulation 108 has been removed to allow fitment of the vent assembly and a site applied insulation repair 110 made around it .
  • the extension tube allows the high integrity requirements of the coating system to be maintained at the vent, and if made from a suitable insulating material, also prevents cold spots on the pipe which may encourage either the formation or hydrates or condensation and the resulting blockage or corrosion.

Abstract

L'invention concerne un système de ventilation destiné à la ventilation de pipelines à revêtement de plastique, ce système étant introduit à travers la paroi d'un pipeline (2) d'acier. Le système (1) de ventilation se compose d'un corps (3) principal comprenant un petit passage traversant. Un élément (5) poreux vient s'adapter dans un évidement (6) du corps (3) principal et un clapet (7) de non retour est maintenue en place par un bouchon (10) de retenue. L'ensemble (1) clapet se trouve à niveau avec la surface (11) interne du pipeline (2). Un micro-espace (13) annulaire sépare le pipeline (2) et le revêtement (12). Ce pipeline (1) sert normalement au transport d'hydrocarbures et le revêtement (12) plastique est perméable aux gaz contenus dans ces derniers. Une faible quantité de gaz passe par conséquent dans le micro-espace (13) d'où il peut s'échapper par un système (1) de ventilation situé à proximité.
PCT/GB1999/002613 1998-08-08 1999-08-09 Ventilation de pipelines a revetement plastique WO2000008368A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU54302/99A AU5430299A (en) 1998-08-08 1999-08-09 Venting of plastics lined pipelines

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9817223.2 1998-08-08
GBGB9817223.2A GB9817223D0 (en) 1998-08-08 1998-08-08 Venting of plastics lined pipelines

Publications (1)

Publication Number Publication Date
WO2000008368A1 true WO2000008368A1 (fr) 2000-02-17

Family

ID=10836883

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1999/002613 WO2000008368A1 (fr) 1998-08-08 1999-08-09 Ventilation de pipelines a revetement plastique

Country Status (3)

Country Link
AU (1) AU5430299A (fr)
GB (1) GB9817223D0 (fr)
WO (1) WO2000008368A1 (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001094820A1 (fr) 2000-06-07 2001-12-13 Coflexip Sa Dispositif de ventilation annulaire de conduit double
WO2002033298A1 (fr) 2000-10-14 2002-04-25 Boreas Consultants Limited Orifice de ventilation pour conduite chemisee
WO2002046654A1 (fr) * 2000-12-05 2002-06-13 Dixon Roche Keith Tuyau ou enceinte pourvu d'une structure annulaire d'event
WO2002050470A2 (fr) * 2000-12-21 2002-06-27 Shell Internationale Research Maatschappij B.V. Conduit pourvu d'un revetement
GB2448200A (en) * 2007-04-05 2008-10-08 Technip France Sa An apparatus for venting an annular space between a liner and a pipeline of a subsea riser
WO2010091062A1 (fr) * 2009-02-06 2010-08-12 Lincoln Composites, Inc. Évents longitudinaux pour récipient sous pression
JP2017536531A (ja) * 2014-09-30 2017-12-07 マイクロ・モーション・インコーポレーテッドＭｉｃｒｏ Ｍｏｔｉｏｎ Ｉｎｃｏｒｐｏｒａｔｅｄ プロセス流体排出アセンブリを備えた電磁流量計流管
US10088110B2 (en) 2016-05-17 2018-10-02 Hexagon Technology As Pressure vessel liner venting via nanotextured surface
US10240706B2 (en) 2016-08-19 2019-03-26 Ethylene, Llc Venting system for lined pipe
WO2019239093A1 (fr) * 2018-06-13 2019-12-19 Ge Oil & Gas Uk Limited Appareil et procédé de ventilation
US10544901B2 (en) 2016-04-06 2020-01-28 Hexagon Technology As Pressure vessel vented boss with sintered metal plug
US10627048B2 (en) 2015-12-16 2020-04-21 Hexagon Technology, As Pressure vessel dome vents
WO2021119843A1 (fr) * 2019-12-20 2021-06-24 Shawcor Ltd. Égalisation de pression dans des tuyaux composites
GB2610824A (en) * 2021-09-15 2023-03-22 Subsea 7 Ltd Vents in pipeline liners

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3735475A (en) * 1967-11-09 1973-05-29 Dow Chemical Co Method of manufacturing vented lined pipe
US4691740A (en) * 1983-03-15 1987-09-08 Phillips Petroleum Company Pipeline lining
EP0361951A2 (fr) * 1988-09-30 1990-04-04 The Dow Chemical Company Anneau de ventilation pour un tuyau à revêtement en matière plastique
US5778938A (en) * 1994-01-18 1998-07-14 Insituform (Netherlands) B.V. Method of installation of dual containment pipe rehabilitation system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3735475A (en) * 1967-11-09 1973-05-29 Dow Chemical Co Method of manufacturing vented lined pipe
US4691740A (en) * 1983-03-15 1987-09-08 Phillips Petroleum Company Pipeline lining
EP0361951A2 (fr) * 1988-09-30 1990-04-04 The Dow Chemical Company Anneau de ventilation pour un tuyau à revêtement en matière plastique
US5778938A (en) * 1994-01-18 1998-07-14 Insituform (Netherlands) B.V. Method of installation of dual containment pipe rehabilitation system

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001094820A1 (fr) 2000-06-07 2001-12-13 Coflexip Sa Dispositif de ventilation annulaire de conduit double
US6848464B2 (en) 2000-06-07 2005-02-01 Coflexip Sa Lined pipe annular venting device
WO2002033298A1 (fr) 2000-10-14 2002-04-25 Boreas Consultants Limited Orifice de ventilation pour conduite chemisee
US7080667B2 (en) 2000-10-14 2006-07-25 Boreas Consultants Limited Lined pipeline vent
WO2002046654A1 (fr) * 2000-12-05 2002-06-13 Dixon Roche Keith Tuyau ou enceinte pourvu d'une structure annulaire d'event
WO2002050470A2 (fr) * 2000-12-21 2002-06-27 Shell Internationale Research Maatschappij B.V. Conduit pourvu d'un revetement
WO2002050470A3 (fr) * 2000-12-21 2003-05-01 Shell Int Research Conduit pourvu d'un revetement
GB2386664A (en) * 2000-12-21 2003-09-24 Shell Int Research Lined pipe wherein the liner comprises a one-way valve
US6983766B2 (en) 2000-12-21 2006-01-10 Shell Oil Company Lined pipe wherein the liner comprises a one-way valve
GB2448200A (en) * 2007-04-05 2008-10-08 Technip France Sa An apparatus for venting an annular space between a liner and a pipeline of a subsea riser
US8342248B2 (en) 2007-04-05 2013-01-01 Technip France Sa Apparatus for venting an annular space between a liner and a pipeline of a subsea riser
GB2448200B (en) * 2007-04-05 2012-05-02 Technip France An apparatus for venting an annular space between a liner and a pipeline of a subsea riser
JP2012517567A (ja) * 2009-02-06 2012-08-02 ヘキサゴン テクノロジー アーエス 圧力容器の長手方向排気口
US9618160B2 (en) 2009-02-06 2017-04-11 Hexagon Technology As Pressure vessel longitudinal vents
WO2010091062A1 (fr) * 2009-02-06 2010-08-12 Lincoln Composites, Inc. Évents longitudinaux pour récipient sous pression
JP2017536531A (ja) * 2014-09-30 2017-12-07 マイクロ・モーション・インコーポレーテッドＭｉｃｒｏ Ｍｏｔｉｏｎ Ｉｎｃｏｒｐｏｒａｔｅｄ プロセス流体排出アセンブリを備えた電磁流量計流管
EP3201575A4 (fr) * 2014-09-30 2018-05-30 Micro Motion, Inc. Tube de courant de débitmètre magnétique ayant un ensemble de ventilation de fluide de traitement
US10627048B2 (en) 2015-12-16 2020-04-21 Hexagon Technology, As Pressure vessel dome vents
US10544901B2 (en) 2016-04-06 2020-01-28 Hexagon Technology As Pressure vessel vented boss with sintered metal plug
US10088110B2 (en) 2016-05-17 2018-10-02 Hexagon Technology As Pressure vessel liner venting via nanotextured surface
US10240706B2 (en) 2016-08-19 2019-03-26 Ethylene, Llc Venting system for lined pipe
WO2019239093A1 (fr) * 2018-06-13 2019-12-19 Ge Oil & Gas Uk Limited Appareil et procédé de ventilation
WO2021119843A1 (fr) * 2019-12-20 2021-06-24 Shawcor Ltd. Égalisation de pression dans des tuyaux composites
GB2610824A (en) * 2021-09-15 2023-03-22 Subsea 7 Ltd Vents in pipeline liners
WO2023041917A1 (fr) 2021-09-15 2023-03-23 Subsea 7 Limited Évents dans des gaines de pipeline
GB2610824B (en) * 2021-09-15 2024-05-15 Subsea 7 Ltd Vents in pipeline liners

Also Published As

Publication number Publication date
AU5430299A (en) 2000-02-28
GB9817223D0 (en) 1998-10-07

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