EP1543269A1 - Conduite isolee et procede de fabrication d'une conduite isolee - Google Patents

Conduite isolee et procede de fabrication d'une conduite isolee

Info

Publication number
EP1543269A1
EP1543269A1 EP03798086A EP03798086A EP1543269A1 EP 1543269 A1 EP1543269 A1 EP 1543269A1 EP 03798086 A EP03798086 A EP 03798086A EP 03798086 A EP03798086 A EP 03798086A EP 1543269 A1 EP1543269 A1 EP 1543269A1
Authority
EP
European Patent Office
Prior art keywords
pipe
jacket
medium
insulating layer
medium pipe
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP03798086A
Other languages
German (de)
English (en)
Inventor
Tom B. Jakobsen
Kim Schacht
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Logstor Ror AS
Original Assignee
Logstor Ror AS
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 Logstor Ror AS filed Critical Logstor Ror AS
Publication of EP1543269A1 publication Critical patent/EP1543269A1/fr
Withdrawn legal-status Critical Current

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

Definitions

  • the invention relates to an insulated pipe intended for advancing media, said media having temperatures lower than the ambient temperature, said pipe comprising at least one jacket pipe, at least one medium pipe and at least one insulating layer situated between the jacket pipe and the medium pipe, wherein the pipe is intended for the jacket pipe and the medium pipe being, prior to operation, interconnected and secured in a pre-tensioned state.
  • the invention further relates to a method of manufacturing a pipeline, said method comprising interconnecting and pre-tensioning of a number of insulated pipes intended for advancing media, said media having temperatures lower than the ambient temperature, said pipes each comprising at least one jacket pipe, at least one medium pipe and at least one insulating layer situated between the jacket pipe and the medium pipe.
  • the invention also relates to a use of a pipeline manufactured by this method.
  • the invention can be used eg for the transport of medium having a relatively low temperature.
  • low temperature is intended to designate a temperature lower than -100°C, including eg the transport of liquid ethylene (- 104°C), liquid natural gas (-163°C), liquid nitrogen (-196°C), and liquid oxygen (183°C).
  • the medium-conveying internal pipe as such, the medium pipe is a steel pipe around which an insulating layer is arranged, of eg foamed polyurethane (PUR) and a polyethylene (PE) jacket on top of the insulation.
  • Pipes of this type are typically designated 'single-pipe pipes'.
  • single-pipe pipes are inconvenient in use due to the thermal contraction of the medium pipe.
  • the configuration of a single- pipe pipeline for submarine use is made even more complex by the necessity of a weight coating of the PE jacket to obtain enough weight to keep the pipeline at the seabed, while simultaneously compensation is to be made for the thermal contraction.
  • single-pipe systems are limited with regard to deployment depth; the PE jacket and PUR foam not being able to resist the ambient pressure in case of high medium-pipe temperatures, without being deformed, since the heat softens the polymeric materials.
  • pipe-in-pipe solutions are often chosen to be able to resist the external pressure.
  • 'Pipe-in- pipe' means that, instead of the PE jacket, a steel pipe is used; ie two steel pipes are used, an inner one and an outer one.
  • the outer one can be provided with some kind of anti-corrosion coating, eg a PE, PP or epoxy coating.
  • pipe-in-pipe solutions can be used, whereby the medium pipe is heated and extended without the jacket pipe undergoing same.
  • the two pipes are joined by welding by means of fixations, so-called bulkheads that connect jacket pipe and medium pipe to each other.
  • fixations so-called bulkheads that connect jacket pipe and medium pipe to each other.
  • This is known eg from pipes for the transport of remote heating, where the medium temperature exceeds the ambient temperature, and where it may be necessary to pre-tension the pre-insulated system in order to reduce the axial tensions.
  • pre-heating is applied to reduce the tensions in critical areas of the pipe system.
  • Novel and characterizing aspects of the pipe according to the invention comprise that the at least one insulating layer is arranged in such a manner that thermal contractions and expansions of the medium pipe are only partially or essentially not transferred to the insulating layer; and that the insulating layer comprises at least one elastic absorbing layer, said absorbing layer being located at the interior side of the insulating layer.
  • the at least one insulating layer being arranged in such a manner that thermal contractions and expansions of the medium pipe are only partially or essentially not transferred to the insulating layer, it is obtained that no adhesion occurs between the medium pipe and the insulating layer. Thereby it is obtained that the latter is not destroyed due to displacement of the pipes relative to each other. Thereby the longevity and insulating capacity are increased.
  • pre-tensioning is not lost.
  • a part of the pre-tensioning may be lost due to the desired displacement being unobtainable due to friction that withholds the displacement. This is of significance in particular if it is desired to pre-tension throughout long lengths.
  • Pre-tensioning throughout long lengths enables savings, eg on bulkheads.
  • the insulating layer comprising at least one elastic absorbing layer, said absorbing layer being located at the inner side of the insulating layer, it is obtained that the major part of the insulating layer can be of a good and convenient insulating material, eg PUR foam that would otherwise be broken due to excessive thermal contraction in case of low temperatures.
  • the elastic absorbing layer is made of a material that is not destroyed by thermal contraction in case of the low temperatures in question, such as eg mineral wool.
  • the at least one insulating layer can moreover be arranged in such a manner that thermal contractions and expansions of the jacket pipe can only partially or essentially not be transferred to the insulating layer. Thereby displacements between the jacket pipe and the insulating layer cannot destroy the insulation either.
  • a friction-reducing layer including layers of polymeric material, grease or wax.
  • a friction-reducing layer including layers of polymeric material, grease or wax.
  • the insulating layer may comprise polyurethane which is a good and applicable insulating material.
  • the polyurethane can be of a type that has a compression strength above 0.1 MPa.
  • the insulating layer may comprise polyurethane of a type having a density of more than 50 kg per cubic meter.
  • the elastic absorbing layer may be mineral wool.
  • the absorbing layer may have a thickness of between 5% and 30% of the overall thickness of the insulating layer. The thickness must be sufficient for absorbing the thermal contraction of the remaining part of the insulating layer thereby avoiding destruction thereof.
  • the interconnection of the medium pipe and the jacket pipe may be accomplished by use of bulkheads.
  • Other joints are also possible, eg spacer blocks that are secured by welding between jacket pipe and medium pipe.
  • the pipe can be configured with the interconnection of the medium pipe and the jacket pipe being performed in a state in which the jacket pipe had a relatively higher temperature than the medium pipe such that, when the medium pipe and the jacket pipe have essentially the same temperature, there is a state of essentially axial tensile stress within the jacket pipe and a state of essentially axial compressive stress within the medium pipe, where transport of a medium in the medium pipe, said medium having a lower temperature than that of the surroundings, results in complete or full relief of the state of compressive stress reigning within the medium pipe.
  • the pipe is suitable for transporting very low-temperature media. If steel-types are selected having a high strength level it is not always necessary to subject the system to pre- tensioning in relation to the selected temperature of operation.
  • Novel and characterizing aspects of the method according to the invention comprise that the at least one insulating layer is arranged in such a manner that thermal contractions and expansions of the medium pipe will only partially or essentially not be transferred to the insulating layer; and that the insulating layer is provided with at least one elastic absorbing layer, said absorbing layer being arranged at the interior side of the insulating layer; and:
  • jacket pipe and medium pipe are, at the free ends of the pipeline, interconnected by bulkhead.
  • a pipeline can be manufactured as pipe-in- pipe pipes that are suitable for transporting media having very low temperatures and whereto a very high degree of pre-tensioning can be imparted, such that the stress level is kept suitably low during transport of very cold media without the insulating layer being destroyed. It is also obtained that the displacement of the jacket pipe and the medium pipe is distributed expediently, it being now an option that the displacement takes place in two directions.
  • the method of manufacturing a pipeline can, according to a convenient embodiment, comprise:
  • the method may comprise that: - following successive interconnection of the pipes by full welding of medium pipe and jacket pipe in an end-to-end relationship, for forming an assembled pipeline with two free ends;
  • a bulkhead is mounted at the other free end of the pipe line that is, in the first instance, only connected to the medium pipe, said bulkhead being of the type wherein the diameter of the outer jacket exceeds that of the jacket pipe; and that the medium pipe is cooled;
  • a preferred use of a pipeline manufactured by a method according to the above may comprise that the pipeline is used for submarine transport of gas, said gas having a temperature lower than minus 50°C.
  • Figure 1 is a cross-sectional view of the pipe wall of a pipe-in-pipe pipe according to the invention.
  • the cross section is taken longitudinally of the main axis of the pipe;
  • Figure 2a shows a simplified cross section of a pipe at a free end of a pipeline with pipes according to the invention and also shows the relative arrangement of bulkhead prior to pre-tensioning;
  • Figure 2b shows a simplified cross section of a pipe at a free end of a pipeline with pipes according to the invention and also shows the relative arrangement of bulkhead after pre-tensioning.
  • Figure 1 shows a pipe-in-pipe pipe 1 comprising a jacket pipe 2, a medium pipe 4 and an insulating layer 6.
  • the insulating layer 6 comprises an elastic absorbing layer 7 arranged to the side that faces towards the medium pipe 4.
  • a friction-reducing layer 8 may be provided between the jacket pipe 2 and the insulating layer 6.
  • a friction-reducing layer 9 Between the medium pipe 4 and the insulating layer 6 there may be arranged a friction-reducing layer 9.
  • the main axis of the pipe is designated by 10.
  • the absorbing layer 7 is arranged as a thin layer of material that is able to absorb a radial and preferably also an axial movement, such as eg mineral wool or corresponding material that is also able to tolerate the low temperature.
  • a radial and preferably also an axial movement such as eg mineral wool or corresponding material that is also able to tolerate the low temperature.
  • the material is also able to tolerate axial movement, it can be avoided to coat the medium pipe 4 with a friction-reducing material.
  • the inner side of the jacket pipe 2 can be coated with a PE film, a layer of grease or some other material that is able to ensure that the insulating layer 6 that may be eg PUR foam does not adhere to the jacket pipe.
  • the length of medium pipe 4 and jacket pipe 2 may be the same with regard to the subsequent mounting of the pipe system. Insulating end sections are mounted, the use of which is known from the manufacture of usual pre- insulated central-heating pipes. For the sake of the weldings that are subsequently to be performed there needs to be a so-called 'cut back' from the end of the pipe. This means that the foam edge is withdrawn from the welding zone such that the insulating layer 6 does not catch fire during the welding procedure.
  • the length of the jacket pipe 2 can also be shorter than the medium pipe 4, as is known from the manufacture of pre-insulated central-heating pipes.
  • an open steel sleeve is subsequently to be mounted by welding therein in order to enable subsequent pre-tensioning of the entire pipe system.
  • the pipe lengths can be supplied in the manner in which pipes are usually delivered, viz. as straight elements of a specific length.
  • FIGS 2a and 2b show a free end of a pipeline, ie a number of pipes that are interconnected. At the opposite, free end of the pipeline it is presupposed that jacket pipe 2 and medium pipe 4 are interconnected, thereby enabling transfer of forces there between.
  • a bulkhead 12 is mounted that comprises a shroud 16, a shroud 14 and a cone 18.
  • the shroud 16 has an internal diameter exceeding the external diameter of the jacket pipe 2.
  • the process of pre-tensioning the pipes can also be exercised by keeping both ends of the pipeline free during heating or cooling, following which jacket pipe 2 and medium pipe 4 are interconnected at both ends, eg by mounting of bulkheads.
  • the jacket pipes 2 can be joined both by end-to-end welding, but assembly is also possible by use of semi-pipe sections of steel.
  • the pipe length can be mounted on land and pulled to sea when the pipe length is assembled and pre-tensioned.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Insulation (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

La présente invention concerne une conduite isolée destinée à véhiculer des substances, la température de ces substances étant inférieure à la température ambiante. La conduite comprend au moins une gaine, au moins une conduite interne et au moins une couche isolante située entre la gaine et la conduite interne. Cette conduite est conçue de manière que la gaine et la conduite interne soient, avant leur utilisation, interconnectées et fixées dans un état de précontrainte. Pour les gazoducs sous-marins servant au transport de gaz liquide dont la température est extrêmement basse, ces pipelines à double conduite ne sont pas encore utilisés car le niveau de sécurité relatif au fonctionnement du gazoduc est insuffisant, les matériaux isolants et les procédés de la technique antérieure s'étant avérés inapplicables. La conduite de cette invention se caractérise en ce que cette couche isolante est conçue de telle sorte que les contractions et les dilatations thermiques de la conduite interne ne se répercutent que peu ou très peu sur la couche isolante et en ce que la couche isolante comprenne au moins une couche absorbante élastique, ladite couche absorbante étant disposée sur la surface intérieure de la couche isolante.
EP03798086A 2002-09-25 2003-09-24 Conduite isolee et procede de fabrication d'une conduite isolee Withdrawn EP1543269A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DK200201426 2002-09-25
DKPA200201426 2002-09-25
PCT/DK2003/000624 WO2004029501A1 (fr) 2002-09-25 2003-09-24 Conduite isolee et procede de fabrication d'une conduite isolee

Publications (1)

Publication Number Publication Date
EP1543269A1 true EP1543269A1 (fr) 2005-06-22

Family

ID=32039053

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03798086A Withdrawn EP1543269A1 (fr) 2002-09-25 2003-09-24 Conduite isolee et procede de fabrication d'une conduite isolee

Country Status (3)

Country Link
EP (1) EP1543269A1 (fr)
AU (1) AU2003266488A1 (fr)
WO (1) WO2004029501A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202006009337U1 (de) 2006-06-14 2006-08-17 Brugg Rohr Ag, Holding Wärmegedämmtes Leitungsrohr
DE102007015660A1 (de) 2007-03-31 2008-10-02 Brugg Rohr Ag, Holding Flexibles wärmeisoliertes Leitungsrohr
AT509015A1 (de) 2009-10-21 2011-05-15 Isoplus Fernwaermetechnik Ges M B H Verbundrohr

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3682346A (en) * 1970-03-23 1972-08-08 Marathon Oil Co Liquid cryogen storage tank for shore, ship or barge
DE2440982A1 (de) * 1974-08-27 1976-03-11 Draegerwerk Ag Waermeisoliirte flexible leitung
US4623585A (en) * 1983-12-07 1986-11-18 Pittsburgh Corning Corporation Cellular ceramic insulating body and method for making same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004029501A1 *

Also Published As

Publication number Publication date
AU2003266488A1 (en) 2004-04-19
WO2004029501A1 (fr) 2004-04-08

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