WO1993019322A1 - Dispositif destine a la reparation des oleoducs et comportant des elements gonflables - Google Patents

Dispositif destine a la reparation des oleoducs et comportant des elements gonflables Download PDF

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Publication number
WO1993019322A1
WO1993019322A1 PCT/AU1993/000121 AU9300121W WO9319322A1 WO 1993019322 A1 WO1993019322 A1 WO 1993019322A1 AU 9300121 W AU9300121 W AU 9300121W WO 9319322 A1 WO9319322 A1 WO 9319322A1
Authority
WO
WIPO (PCT)
Prior art keywords
repair
flexible
conduit
flexible material
pressure medium
Prior art date
Application number
PCT/AU1993/000121
Other languages
English (en)
Inventor
Robert Walter Vowels
Original Assignee
Barry Bros. Specialised Services Pty. Ltd.
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 Barry Bros. Specialised Services Pty. Ltd. filed Critical Barry Bros. Specialised Services Pty. Ltd.
Priority to EP93906387A priority Critical patent/EP0632874A4/fr
Publication of WO1993019322A1 publication Critical patent/WO1993019322A1/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
    • F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
    • F16L55/162—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe
    • F16L55/163—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a ring, a band or a sleeve being pressed against the inner surface of the pipe
    • 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
    • F16L55/18—Appliances for use in repairing pipes

Definitions

  • the present invention relates to apparatus used in the process of refurbishing damaged conduits, pipelines and sewer pipes through the application of a reinforced lining to their inner walls by means of an inflatable form.
  • the present invention is particularly but not exclusively intended for use in the repair of underground pipelines in situ to avoid the necessity of excavating the pipeline or re-routing flow from the pipeline around the repair site.
  • a second method used involves carrying a layer of resin impregnated reinforcing material on an inflatable form to the repair zone within the pipe and thereafter inflating the inflatable form to press and hold the repair layer against the section of the pipe requiring repair for a length of time sufficient to allow the resins to cure.
  • Examples of this type of repair can be seen in G.B. Patent No. 2136912, European Patent No. 370193 and Swiss Patent No. 635181.
  • a short coming of these known systems is that the inflatable forms used essentially fully block the pipe during the repair process thereby interrupting all flow in the pipeline. Bypassing of the section being refurbished or some other means of stopping flow in the pipeline being repaired is therefore a necessity.
  • a third form of pipeline repair is also shown in prior art specification but this type of process is not intended to refurbish a length of pipeline but rather is intended to repair localised defects, commonly cracks or gaps between discrete section lengths of a pipeline.
  • this type of repair process a settable liquid or semi-liquid sealant is pumped or forced into a zone between two axially spaced inflated parts pressed against the inner wall of the pipeline. Examples of this type of device are shown in U.S. Patent Nos. 3,9058,607, 4,763,51 1 , 3,618,639, 3,762,446, 3,834,421 , 3,958,607, 3,946,761 and G.B. Patent No. 2169983.
  • These prior art references do not permit refurbishment of a length of pipe as the repair material cannot include a resurfacing material and cannot reliably extend over any length of an inner surface of a pipe as opposed to a crack or gap between pipe section lengths.
  • German Patent Application No. DE 3922351 it has been proposed to provide an annular form with an inflatable envelope on its outer surface such that flow within the pipeline being repaired may continue through the annular form while the repair process is being carried out. This avoids the problem discussed above relating to re-routing or stopping flow in the pipeline being repaired, however certain difficulties still exist.
  • the form disclosed is essentially rigid making it extremely difficulty to get the form into an underground repair position from an above ground location when the form length is above a certain predetermined length. That is, above a certain length it is difficult or impossible to manoeuvre a rigid form within the confines of a manhole or access pit.
  • Australian Patent Application No. 54471/90 discloses an arrangement wherein the inflatable form is formed by a plurality of individually rigid annular segments which are pressed together by cable tensioning means to form a rigid annular form when in use, the cable tensioning means being capable of being relaxed to allow the individual segments to be arranged at an angle to adjacent segments thereby facilitating introduction of the form into the pipeline from an above ground position or movement through a pipeline to the desired repair location. While this arrangement does not have the same problem as discussed above in relation to German Patent Specification No. DE 3922351 , it does have a problem in that it is complicated in construction and difficult to use where it is necessary to tighten the cable tensioning means underground at the repair location. While this can be achieved, it is an added complication in cost of producing the repair apparatus and in using the apparatus during a repair process.
  • a still further problem with many prior art repair devices is that the inflation envelope or bag is commonly produced from a stretchable or expandable material such as rubber or rubber like material.
  • a pipeline may be broken with a reasonably large washed out cavity in the earth around the break. Where this has occurred, it is possible for the pressure of an elastic inflatable form to displace a broken section, distend into the cavity and burst. If the repair is only partially cured it may, as result, be a failure and be impossible to remove without excavating the whole section of the pipeline.
  • G.B. Patent Specification No. 2136912 discloses an inflatable form of the same general type as discussed above wherein the inflatable bag is produced from a non stretchable material such as nylon coated internally with Neoprene (for waterproofing).
  • the diameter of this bag is selected to be generally equal to the diameter of the pipe being repaired less twice the thickness of the repair material.
  • This G.B. patent does not, however, disclose any method of contacting the inflatable bag after the repair process has been completed to enable the repair device to be removed from the pipeline being repaired which is normally achieved by making the bag from an elastic material.
  • the objective of the present invention is generally to provide repair apparatus and a method of operating such repair apparatus which will solve all or at least some of the difficulties associated with prior art devices as discussed above.
  • the present invention aims at providing repair apparatus which can be positioned as desired within a pipe to be repaired from an above ground position without significant complications in construction or use of the apparatus and without preventing normal flow in the pipeline being repaired while the repair process is carried out.
  • the present invention aims at providing apparatus which will prevent the inflatable form expanding into a cavity surrounding the repair zone beyond a predetermined limit thereby ensuring against the inflation material bursting with the possible consequent effect of the repair material and repair apparatus becoming irretrievably stuck at the repair site, while at the same time allowing contraction of the inflatable form upon completion of the repair process.
  • the present invention provides apparatus for applying in situ a repair material in the form of a sleeve or sheet including a settable material to a repair zone of an inner wall of a conduit or pipeline, said apparatus comprising a core member having a radially expandable device located outwardly of said core member and extending axially along and at least partially circumferentialiy around said core member, said core member including a hollow flexible tube of a non perforate material and having a fixed axial length capable of transverse bending but adapted to resist inward deformation caused by internal pressure within said expandable device during ⁇ f repair operation.
  • apparatus of the aforementioned kind comprises a pair of rigid end members interconnected by said hollow flexible tube, each of said end members having a central through flow opening communicating with the hollow interior of the hollow flexible tube.
  • the expandable device comprises a flexible sheet or tube connected at either end to the rigid members and defining at least in part, an enclosed space adapted to inflate under action of an applied pressure medium.
  • the present invention also provides apparatus for applying in situ a repair material to a repair zone of an inner wall of a conduit or pipeline, said repair material comprising a sheet or sleeve of predetermined dimensions including a settable repair substance, said apparatus comprising a radially expandable device arranged to carry said repair material to said repair zone and to press said repair material outwardly against the inner wall of said conduit or pipeline on either side of said repair zone, said expandable device including a flexible material forming an outer part of an expandable cavity, means being provided to allow a pressure medium to be directed into or withdrawn from said expandable cavity whereby, when the pressure medium is directed into said expandable cavity, the flexible material is moved radially outwardly, control means forming part of said radially expandable device to prevent said flexible material moving substantially in a radial direction beyond a predetermined limit and to radial contraction of said flexible material upon said pressure medium being withdrawn from said expandable cavity.
  • the flexible material is non-elastic forming the control means preventing radial expansion beyond a predetermined limit, said control means further including recovery means separate from said flexible material enabling said material to contract radially inwardly upon withdrawal of said pressure medium from said expandable cavity.
  • the flexible material is elastic and said control means comprises one or more non-elastic circumferentially extending members co ⁇ operating with said flexible material to prevent said flexible material moving substantially in a radial direction beyond said predetermined limit.
  • the present invention also provides a method applying in situ a repair material comprising a sleeve or sheet or including a settable material or substance to a repair zone within a pipe or conduit to be repaired, said method comprising: applying externally of said pipe or conduit to be repaired, said repair material to repair apparatus comprising a radially expandable device including a flexible material forming an outer part of an expandable cavity and means for directing a pressure medium to or withdrawing a pressure medium from said expandable cavity, said repair material being positioned radially outwardly of said radially expandable device; carrying said repair material on said repair apparatus into the pipe or conduit to be repaired and positioning said repair material adjacent said repair zone; introducing a pressure medium into said expandable cavity and thereby expanding said flexible material outwardly so as to press the repair material against an inner wall part of the pipe or conduit on either axial side of said repair zone, while restraining expansion of said flexible material so as to prevent expansion of said flexible material through the pipe or conduit being repaired at said repair
  • said flexible material is non-elastic and said recovery means comprises, one or more circumferentially extending elastic members co-operating with said non-elastic flexible material.
  • the flexible material may be formed from an elastic material and at least one circumferentially extending non-elastic member co-operating with said elastic flexible material is provided to prevent the expansion of said flexible material through the pipe or conduit being repaired at said repair zone beyond the predetermined limit. Consequently the flexible material has a fully inflated diameter between 100 and 150%, preferably about 110%, of the inner diameter of the pipeline after application of the repair material thereto.
  • Figure 1 is a longitudinal cross-sectional view of a first embodiment of the present invention
  • Figure 2 is a longitudinal cross-sectional view of a second embodiment of the present invention.
  • Figure 3 is a view sharing the embodiment of Figure 2 in a position of use;
  • Figure 4a is a cross-sectional view along line A-A of Figure 2;
  • Figure 4b is a partial section view of the end of the apparatus adjacent section A-A with the sheath member removed for the sake of clarity;
  • Figure 5 is a cross-sectional view along line B-B of Figure 2.
  • Figure 6 is a cross-sectional view along line C-C of Figure 2; and Figure 7 is a view similar to Figure 6 except that the expandable cavity has been expanded.
  • the apparatus 10 is shown within a pipe 11 to be repaired having a repair zone 12.
  • the apparatus 10 comprises a pair of longitudinal spaced end members 13, 14 which may be formed from solid metal or fabricated from sheet metal such as aluminium or an aluminium alloy.
  • Each member 13, 14 has a longitudinal through flow passage 15 and connection means 16 to permit connection of cables 30 or the like ( Figure 3) to allow positioning of the member within the pipe to be repaired.
  • a flexible tube 17 interconnects the two end members 13, 14.
  • the tube 17 is conveniently formed from a rubber or other elastomeric material and is reinforced so that deflections or deformations inwardly are resisted but the tube 17 is sufficiently flexible to allow transverse bending to allow the apparatus to be moved around bends in the pipe 11 to be repaired.
  • Flexible cables or chains 18 are provided interconnecting the two end members 13, 14 to ensure that they do not separate under the loads required to winch same into position or to withdraw same after a repair process has been completed.
  • the through flow passages 15 and the interior of the tube 17 provide a longitudinal passage that allows continued flow through the pipe 11 during positioning or withdrawal of the apparatus 10 and during the repair process itself.
  • a flexible and expandable tube 19 Radially outwardly of the tube 17 is a flexible and expandable tube 19 which is connected by any suitable means 26, 27 at either end to the end members 13, 14.
  • the flexible and expandable tube 19 defines an expandable cavity 20 essentially between itself and the outer surface of the tube 17.
  • Access is provided through one or more passage means 21 in at least one of the end members 13, 14 to allow introduction or withdrawal of a pressure medium (liquid or air - preferably heated) to the cavity 20 to thereby expand this cavity and move the tube 19 radially outwardly. If the tube 19 is elastic and therefore stretchable then upon withdrawing the pressure medium from the cavity 20, the tube will contract radially inwardly.
  • a sheath member 22 Located radially outwardly from the tube 19 is a sheath member 22 which is connected at one end 23 to one of the end members 13.
  • the sheath member 22 is provided to assist removal of the apparatus from the pipeline upon completion of a repair operation as is explained in Australian Patent Application No. 54771/90.
  • the sheath member 22 may alternatively be constructed as a separate unit as disclosed in Australian Provisional Patent Application No. PL 1466 filed on the 20th March, 1992.
  • the subject matters of these co-pending patent applications are included herein by this cross reference thereto.
  • the sheath member 22 carries to the repair zone 12 ( Figure 3), a repair material 24 in the form of a reinforcement impregnated with a settable material such as a thermosetting resin.
  • the settable material will not readily set at normal temperatures but will set upon an elevated pressure medium (such as hot water) being introduced into the expandable cavity 20.
  • Figure 2 illustrates in longitudinal cross-section an alternative embodiment to the apparatus shown in Figure 1. Like features in Figure 2 have been given the same reference numerals as in Figure 1 and are not further described hereafter.
  • the essential difference between the two arrangements lies in the configuration of the member 19 forming the outer wall of the expanding cavity 20.
  • the wall is formed by a non-elastic non-stretchable flexible material which is capable of containing the pressure of the injection medium used.
  • a knitted polyester fibre yarn coated with vinyl material to provide a seal has been found satisfactory.
  • Other materials that are non- elastic under normal operating pressures, that are flexible, and that are capable of retaining the pressure medium during use, may equally be used.
  • the end of the tubular member 19 is wrapped about the end member 13 (or 14) and is sealed thereto with a suitable sealant and clamping bands 26.
  • a suitable sealant and clamping bands 26 As a result, in the position where there is no pressure medium in the cavity 20 or insufficient medium to expand the cavity 20 (as illustrated schematically in Figure 2, 4b, 5 and 6), the material forming the wall 19 is folded in on itself to form a trough 27 and is maintained in this contracted position by a plurality of elastic bands 25 spaced along the full longitudinal length of the apparatus.
  • the bands 25 may be secured to the tube 19 to axially locate same as desired.
  • the bands 25, if suitably secured to the tube 19 could also be positioned inwardly of the tube 19.
  • one long elastic sleeve could also be used in substitution for the elastic bands 25.
  • the folds in the material forming the wall 19 move outwardly so that the wall as a whole moves radially outwardly to the position illustrated in Figures 3 and 7.
  • the tube 19 may still expand radially outwardly until all the material of the tube 19 is used in its circumference and at this stage no further outward movement is possible.
  • the radial outward movement occurs against radially inward forces provided by the bands 25 which again contract the wall 19 when the pressure medium is removed from the cavity 20.
  • the material of the wall 19, being essentially non-extensible itself, prevents the cavity 20 expanding to such a condition that wall 19 may distend into a washed out cavity around the repair zone of the pipe being repaired and, as a result, burst.
  • the flexible material tube 19 from an elastic material which is capable of stretching outwardly under pressure applied from within the expandable cavity 20.
  • These non- elastic circumferentially extending members may be in the form of a plurality of bands (similar to bands 25) or perhaps a single sleeve member.
  • the members would be secured at one or more circumferential locations to the tube 19 and if desired could be located inwardly or outwardly of the tube 19.
  • both embodiments of Figure 1 and 2 are moved into position adjacent the repair zone 12 by apparatus not shown.
  • the embodiment of Figure 2 is shown in Figure 3. in this position, the cavity 20 is expanded by introduction of a pressure medium so that the wall 19 moves radially outwardly to press the repair material 24 against the pipe wall 11 on opposed axial sides of the repair zone 12.
  • the repair material is not extended into the cavity behind the repair zone beyond a certain limit as discussed above. If there is no deep cavity at the repair zone, the repair material might be pressed against the entire repair zone if desired.
  • the cavity 20 is deflated and the apparatus is removed by withdrawing in a direction such that the sheath member 22 will peel from the repair material by at least partial eversion.
  • the apparatus would be withdrawn by movement towards the right in Figure 1 , 2 and 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pipe Accessories (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

On décrit un dispositif, destiné à la réparation in situ d'une paroi interne de conduite ou de tuyau, consistant à comprimer un matériau de réparation formant une lame ou un manchon (24) contre la zone de réparation (12) de la conduite ou du tuyau. Ce dispositif comprend un tube central (17) permettant le passage d'un liquide pendant la réparation, et une zone gonflable (20) entourant ce tube (17) et définie par un tube de matière souple inélastique (19) obturé vers les extrémités opposées du tube central (17). Ce tube de matière souple inélastique forme un élément régulateur empêchant la dilatation radiale au-delà d'une limite déterminée et présente généralement un diamètre de gonflage proche du diamètre de la conduite ou du tuyau à réparer. Le dispositif comporte aussi un système (21) permettant d'introduire un fluide de gonflage dans la zone gonflable (20), ainsi que des bandes élastiques (25) qui entourent le tube de matière souple inélastique (19) et le contractent lorsqu'on dégonfle ladite zone gonflable (20).
PCT/AU1993/000121 1992-03-24 1993-03-24 Dispositif destine a la reparation des oleoducs et comportant des elements gonflables WO1993019322A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP93906387A EP0632874A4 (fr) 1992-03-24 1993-03-24 Dispositif destine a la reparation des oleoducs et comportant des elements gonflables.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPL150692 1992-03-24
AUPL1506 1992-03-24

Publications (1)

Publication Number Publication Date
WO1993019322A1 true WO1993019322A1 (fr) 1993-09-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1993/000121 WO1993019322A1 (fr) 1992-03-24 1993-03-24 Dispositif destine a la reparation des oleoducs et comportant des elements gonflables

Country Status (3)

Country Link
EP (1) EP0632874A4 (fr)
CA (1) CA2132701A1 (fr)
WO (1) WO1993019322A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001077569A3 (fr) * 2000-04-05 2002-02-07 Flexfab Horizons Int Inc Vessie de reparation au fluorocarbure
WO2004079252A1 (fr) * 2003-03-05 2004-09-16 Tracto-Technik Gmbh Adaptateur pour guidage de tuyaux
EP1626220A1 (fr) * 2004-08-11 2006-02-15 David Campbell Mitchell Methode et dispositif de réparation de l'étanchéité d'une canalisation
WO2011057734A1 (fr) * 2009-11-10 2011-05-19 Röranalysgruppen I Europa Ab Appareil et procede pour installer une gaine dans un tuyau
US8783297B2 (en) 2011-04-27 2014-07-22 Massachusetts Institute Of Technology Robotic system for pipeline rehabilitation

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2440086A1 (de) * 1974-08-19 1976-03-11 Main Gaswerke Ag Verfahren und vorrichtung zum inneren abdichten von rohrmuffenverbindungen
GB2136912A (en) * 1983-03-16 1984-09-26 Michael Francis Barry Sealing pipes
AU5447190A (en) * 1989-04-07 1990-11-05 Barry Bros. Specialised Services Pty Ltd Method of repairing a pipeline and apparatus for use in such a method
US5049003A (en) * 1989-08-23 1991-09-17 Kenneth Barton Method and apparatus for repairing ruptures in underground conduits
EP0450975A2 (fr) * 1990-04-05 1991-10-09 Subterra Limited RevÀªtement de conduites, et dispositif pour effectuer ce revêtement
DE4104185A1 (de) * 1991-02-12 1992-08-13 Hans Mueller Verfahren und vorrichtung zum partiellen sanieren eines im erdreich verlegten abwasserkanals

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2440086A1 (de) * 1974-08-19 1976-03-11 Main Gaswerke Ag Verfahren und vorrichtung zum inneren abdichten von rohrmuffenverbindungen
GB2136912A (en) * 1983-03-16 1984-09-26 Michael Francis Barry Sealing pipes
AU5447190A (en) * 1989-04-07 1990-11-05 Barry Bros. Specialised Services Pty Ltd Method of repairing a pipeline and apparatus for use in such a method
US5049003A (en) * 1989-08-23 1991-09-17 Kenneth Barton Method and apparatus for repairing ruptures in underground conduits
EP0450975A2 (fr) * 1990-04-05 1991-10-09 Subterra Limited RevÀªtement de conduites, et dispositif pour effectuer ce revêtement
DE4104185A1 (de) * 1991-02-12 1992-08-13 Hans Mueller Verfahren und vorrichtung zum partiellen sanieren eines im erdreich verlegten abwasserkanals

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0632874A4 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001077569A3 (fr) * 2000-04-05 2002-02-07 Flexfab Horizons Int Inc Vessie de reparation au fluorocarbure
WO2004079252A1 (fr) * 2003-03-05 2004-09-16 Tracto-Technik Gmbh Adaptateur pour guidage de tuyaux
GB2414055A (en) * 2003-03-05 2005-11-16 Tracto Technik Pipe guide adapter
GB2414055B (en) * 2003-03-05 2006-06-07 Tracto Technik Pipe guide adapter
US8757931B2 (en) 2003-03-05 2014-06-24 Tt Schmidt Gmbh Pipe guide adapter
EP1626220A1 (fr) * 2004-08-11 2006-02-15 David Campbell Mitchell Methode et dispositif de réparation de l'étanchéité d'une canalisation
WO2011057734A1 (fr) * 2009-11-10 2011-05-19 Röranalysgruppen I Europa Ab Appareil et procede pour installer une gaine dans un tuyau
US9657883B2 (en) 2009-11-10 2017-05-23 Repiper Ab Apparatus and method for installing a liner in a pipe
US8783297B2 (en) 2011-04-27 2014-07-22 Massachusetts Institute Of Technology Robotic system for pipeline rehabilitation

Also Published As

Publication number Publication date
EP0632874A4 (fr) 1995-03-29
CA2132701A1 (fr) 1993-09-30
EP0632874A1 (fr) 1995-01-11

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