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WO1996005461A1 - Tuyau flexible - Google Patents

Tuyau flexible Download PDF

Info

Publication number
WO1996005461A1
WO1996005461A1 PCT/GB1995/001796 GB9501796W WO9605461A1 WO 1996005461 A1 WO1996005461 A1 WO 1996005461A1 GB 9501796 W GB9501796 W GB 9501796W WO 9605461 A1 WO9605461 A1 WO 9605461A1
Authority
WO
WIPO (PCT)
Prior art keywords
flexible hose
permeability
layer
hose according
strip
Prior art date
Application number
PCT/GB1995/001796
Other languages
English (en)
Inventor
Graham Gallant
Stephen John Richards
Original Assignee
Dunlop 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
Priority claimed from GB9415975A external-priority patent/GB9415975D0/en
Priority claimed from GB9415972A external-priority patent/GB9415972D0/en
Application filed by Dunlop Limited filed Critical Dunlop Limited
Priority to AU31202/95A priority Critical patent/AU3120295A/en
Publication of WO1996005461A1 publication Critical patent/WO1996005461A1/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
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L11/12—Hoses, i.e. flexible pipes made of rubber or flexible plastics with arrangements for particular purposes, e.g. specially profiled, with protecting layer, heated, electrically conducting
    • F16L11/133—Hoses, i.e. flexible pipes made of rubber or flexible plastics with arrangements for particular purposes, e.g. specially profiled, with protecting layer, heated, electrically conducting buoyant
    • 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
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L11/08—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall
    • 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
    • F16L33/00—Arrangements for connecting hoses to rigid members; Rigid hose-connectors, i.e. single members engaging both hoses
    • F16L33/01—Arrangements for connecting hoses to rigid members; Rigid hose-connectors, i.e. single members engaging both hoses specially adapted for hoses having a multi-layer wall
    • 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
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L2011/047—Hoses, i.e. flexible pipes made of rubber or flexible plastics with a diffusion barrier layer

Definitions

  • This invention relates to a flexible hose and in particular, although not exclusively, to a flexible hose for the conveyance of LPG (liquified petroleum gas).
  • LPG liquid petroleum gas
  • This invention seeks to provide an improved flexible hose which at least mitigates some of the problems of prior art hoses.
  • the present invention provides a flexible hose comprising a reinforcement structure of reinforcing elements embedded in polymeric material and a permeation barrier comprising at least one layer of barrier material having a low permeability as herein defined, said permeation barrier comprising a layer of high permeability material sandwiched between two layers of a relatively low permeability.
  • the permeation barrier may be radially inwards or radially outwards of the reinforcement structure.
  • the high permeability material may have uniform permeability in all directions. Alternatively and preferably the material has a preferential direction of permeability and in the flexible hose is arranged with that preferential direction of high permeability extending axially along the length of the hose.
  • the radially inner and radially outer layers of relatively low permeability material preferably are of a material having a permeability (as measured in a radially outwards direction when in situ in a hose) which is less than one fifth, preferably less than 2% and more preferably less than 1 % of the permeability or highest permeability of the high permeability material.
  • a permeability as measured in a radially outwards direction when in situ in a hose
  • Examples are nitrile butadiene rubber, polychloroprene and fluorinated rubbers.
  • the radially inner layer of relatively low permeability material and/or the material of that layer may have a permeability which is less, e g at least two times less, than the radially outer layer of relatively low permeability material and/or the material of that outer layer.
  • the invention envisages also that the radially inner and outer layers and/or the material of those layers may be of the same permeability.
  • the material of a layer of relatively low permeability preferably has a permeability of less than 2 cm 3 /m 2 /day, more preferably less than 0.3 cm 3 /m 2 /day.
  • references to permeability and relative permeability relate to the permeability of material when measured at 23 "C under a pressure difference of 1 bar and in relation to permeation of oxygen.
  • Suitable material for the layers of low permeability include polymeric material such as rubber and other elastomeric materials, non-elastomeric materials such as metallised film, e g aluminium or brass on a base layer of e g polyester and/or polyethylene, ethyiene vinyl alcohol, fluorinated ethylene propylene and polyamide film such as nylon 6.
  • a layer of low permeability material may be formed for example by extrusion or by spiral or lengthwise application of strip material.
  • a layer of low permeability preferably comprises at least one layer of barrier material having a low permeability and comprising an elongate strip of said barrier material arranged to provide a barrier which is substantially continuous along the length of and around the bore of the hose.
  • a layer of said barrier material in strip form may be provided additionally or alternatively at a part of the hose which is separate from the permeation barrier of the invention.
  • it is provided inwards of said permeation barrier though a radially outer location is not excluded by the teaching of the invention.
  • Said strip material of a permeation barrier preferably has a thickness less than 150 microns.
  • a thickness in the range 10 to 40 microns is believed to be particularly preferred.
  • the strip material may lie spirally within the hose.
  • the strip may be applied with successive turns overlapped and/or one strip may be overlapped by a second strip.
  • the strip material may be bonded to the surrounding reinforcement structure and to any radially inwards layers of the hose such as an inner polymeric lining layer.
  • the bond at overlap regions may be provided by a base layer material of the strip, e g polyester or polyethylene and which has a melting point lower than that of the metallised material.
  • Said layer of high permeability material may be bonded to at least one and preferably both of the layers of relatively low permeability.
  • Suitable materials for the layer of high permeability material include fabrics of e g polyester, glass, ceramics, cotton, rayon and other materials such as rubber.
  • the material preferably is in filamentary form, as in a yarn, strand or cord and arranged with the filaments extending generally lengthwise of the hose so that the material provides a higher permeability in that direction than radially of the hose.
  • Filamentary material may lie spiralled or extend generally parallel with the lengthwise direction of the hose.
  • the permeation barrier may be bonded to the radially outer reinforcement layer.
  • the flexible hose may be of a twin carcass construction comprising two reinforcement carcasses each able individually to withstand the pressure of fluid in the bore of the hose.
  • An example of a suitable twin carcass construction is that described in our United Kingdom Patent Specification No. 1 ,503,502.
  • a second said permeation barrier may be provided to surround the inner carcass reinforcement and lie inwards of the outer carcass reinforcement.
  • Two of said permeation barriers may be provided in a twin carcass hose and be arranged to be separately rupturable. Thus in the event of failure of the inner, main carcass only one of the permeation barriers should be damaged or liable to damage and the other should remain serviceable.
  • Two permeation barriers may be arranged to lie respectively outwards of the main and a secondary reinforcement carcass, or respectively inwards of those carcasses.
  • the flexible hose may be a buoyant hose. It may have a layer of buoyancy material which surrounds the or each reinforcement structure.
  • the flexible hose may be part of a hose assembly in which an end fitting is built in integrally at at least one end of the hose.
  • the end fitting may have a tubular insert portion which extends axially within the bore of the hose.
  • An outer surface of that insert portion may be formed with an annular rib.
  • the permeation barrier may be constructed to have at least some of its layers extending over that rib.
  • the outer low permeability layer and the high permeability layer may interconnect with means for recovery or venting of fluid permeating axially along the high permeability layer.
  • the outer low permeability layer may extend over the rib and the high permeability layer may terminate adjacent the rib; vent means such as a passage(s) extending axially through the rib may be provided to assist recovery or venting of fluid permeating axially along the high permeability layer.
  • vent means such as a passage(s) extending axially through the rib may be provided to assist recovery or venting of fluid permeating axially along the high permeability layer.
  • the radially inner low permeability layer may be bonded to the end fitting e g at least at a position axially inwards of a rib.
  • the radially inner low permeability layer may be an innermost layer of the hose and it may be supported against collapse by an inner helical support wire, e g a metal cord.
  • the radially inner low permeability layer may lie outwards of a hose lining layer which may be a layer adapted to protect the low permeability layer from abrasive or other damage,
  • Figure 1 is a longitudinal section of part of a hose assembly and flexible hose of the invention
  • Figure 2 is a longitudinal section showing an end fitting in more detail
  • Figures 3A and 3B are end and side views of the end fitting shown in Figure 2.
  • Figure 1 shows part of a rough bore standard dock hose and an end fitting 1.
  • the hose has an inner wire helix 2 which supports the hose body against collapse by external pressure and resists kinking.
  • the helix 2 is surrounded by an inner support lining 3 of a textile fabric over which is located a permeation barrier 4.
  • Barrier 4 is surrounded by and bonded to the main hose reinforcement carcass 6 comprising reinforcing elements embedded in polymeric material, e g rubber.
  • the permeation barrier 4 comprises a high permeability layer 7 sandwiched between and bonded to radially outer low permeability layers 5.
  • the three layers of the barrier 4 extend axially over an annular rib 1 ' on the outer surface of the insert portion of the end fitting.
  • the inner low permeability layer is bonded to the rib and the outer surface of the insert portion at the region thereof which is axially inwards of the rib 1 '.
  • the inner low permeability layer 5 terminates adjacent the axially inwards side of a second rib 1 " and the high permeability layer also terminates at that rib 1 " at a position adjacent a series of axially extending passages 9.
  • the outer low permeability layer 5 extends over and is bonded to said second rib 1 ".
  • the inner and outer low permeability layers 5 are each layers of a relatively low permeability type of rubber such as nitrile butadiene rubber or chloroprene rubber.
  • the layers are formed by spiral winding of strips of the rubber, and the strip material forms axially and circumferentially continuous barrier layers during vulcanisation of the completed hose assembly.
  • the intervening high permeability layer 7 comprises a layer of polyester cords wound spirally and optionally at touch pitch at an angle e g of 54 ° 44' relative to the lengthwise direction of the hose. This angle minimises the restrictive effect of the cords on the hose flexibility.
  • a pipe 10 collects from the passages 9 the fluid e g vapour, which has permeated along the high permeability layer 7 and conveys it to a control valve 1 1 for recovery or controlled venting. Recovery or venting is via a pipe 12 which extends spirally along the hose around the reinforcement carcass 6.
  • a layer 20 of buoyancy material surrounds the carcass 6 and the pipe 12.
  • Figures 3A and 3B show the end fitting in more detail and the pipes 10 which connect with three rib passages 9.

Landscapes

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

Abstract

Tuyau flexible comprenant une structure (6) de renforcement composée d'éléments renforçateurs encastrés dans un matériau polymère, ainsi qu'une barrière (4) de perméance comportant une couche (7) de matériau hautement perméable pris en sandwich entre deux couches (5) d'un matériau relativement peu perméable.
PCT/GB1995/001796 1994-08-06 1995-07-31 Tuyau flexible WO1996005461A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU31202/95A AU3120295A (en) 1994-08-06 1995-07-31 Flexible hose

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB9415975.3 1994-08-06
GB9415975A GB9415975D0 (en) 1994-08-06 1994-08-06 Flexible hose
GB9415972A GB9415972D0 (en) 1994-08-06 1994-08-06 Flexible hose
GB9415972.0 1994-08-06

Publications (1)

Publication Number Publication Date
WO1996005461A1 true WO1996005461A1 (fr) 1996-02-22

Family

ID=26305423

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1995/001796 WO1996005461A1 (fr) 1994-08-06 1995-07-31 Tuyau flexible

Country Status (2)

Country Link
AU (1) AU3120295A (fr)
WO (1) WO1996005461A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009127650A1 (fr) * 2008-04-15 2009-10-22 Single Buoy Moorings Inc. Raccord d'extrémité pour tuyau composite et procédé d'assemblage d'un tuyau composite sur un tel raccord d'extrémité
WO2018000091A1 (fr) * 2016-06-27 2018-01-04 Shawcor Ltd. Tuyau polymère à éléments de ventilation axiaux

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2027838A (en) * 1978-06-14 1980-02-27 Bridgestone Tire Co Ltd Detecting leakage in a transport hose
GB2114257A (en) * 1982-01-30 1983-08-17 Dunlop Ltd Improvements in and relating to flexible barriers
WO1987000147A1 (fr) * 1985-07-10 1987-01-15 Merit Plastics Inc. Tuyau composite d'alimentation en essence et en vapeur
US4907625A (en) * 1987-12-28 1990-03-13 Tokai Rubber Industries, Ltd. Refregerant transporting hose
EP0611104A1 (fr) * 1993-02-09 1994-08-17 Bridgestone Corporation Tuyau avec détection d'une fuite
EP0668464A1 (fr) * 1994-02-09 1995-08-23 Hutchinson Tuyau souple pour le transport de liquides, notamment volatils, ou de gaz

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2027838A (en) * 1978-06-14 1980-02-27 Bridgestone Tire Co Ltd Detecting leakage in a transport hose
GB2114257A (en) * 1982-01-30 1983-08-17 Dunlop Ltd Improvements in and relating to flexible barriers
WO1987000147A1 (fr) * 1985-07-10 1987-01-15 Merit Plastics Inc. Tuyau composite d'alimentation en essence et en vapeur
US4907625A (en) * 1987-12-28 1990-03-13 Tokai Rubber Industries, Ltd. Refregerant transporting hose
EP0611104A1 (fr) * 1993-02-09 1994-08-17 Bridgestone Corporation Tuyau avec détection d'une fuite
EP0668464A1 (fr) * 1994-02-09 1995-08-23 Hutchinson Tuyau souple pour le transport de liquides, notamment volatils, ou de gaz

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009127650A1 (fr) * 2008-04-15 2009-10-22 Single Buoy Moorings Inc. Raccord d'extrémité pour tuyau composite et procédé d'assemblage d'un tuyau composite sur un tel raccord d'extrémité
US8881436B2 (en) 2008-04-15 2014-11-11 Trelleborg Industrie Sas Fluid-tight end fitting for a composite hose and method of assembling a composite hose on such end fitting
WO2018000091A1 (fr) * 2016-06-27 2018-01-04 Shawcor Ltd. Tuyau polymère à éléments de ventilation axiaux

Also Published As

Publication number Publication date
AU3120295A (en) 1996-03-07

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