WO1990003259A1 - A method of lining a pipe - Google Patents

A method of lining a pipe Download PDF

Info

Publication number
WO1990003259A1
WO1990003259A1 PCT/GB1989/001156 GB8901156W WO9003259A1 WO 1990003259 A1 WO1990003259 A1 WO 1990003259A1 GB 8901156 W GB8901156 W GB 8901156W WO 9003259 A1 WO9003259 A1 WO 9003259A1
Authority
WO
WIPO (PCT)
Prior art keywords
balloon
sleeve
pipe
resin
lining
Prior art date
Application number
PCT/GB1989/001156
Other languages
French (fr)
Inventor
Roy Mackay
Original Assignee
Roy Mackay
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 GB888826829A external-priority patent/GB8826829D0/en
Application filed by Roy Mackay filed Critical Roy Mackay
Publication of WO1990003259A1 publication Critical patent/WO1990003259A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/26—Lining or sheathing of internal surfaces
    • B29C63/28—Lining or sheathing of internal surfaces applied by "rubber" bag or diaphragm
    • 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
    • F16L55/165—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section
    • F16L55/1652—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section the flexible liner being pulled into the damaged section
    • F16L55/1654—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section the flexible liner being pulled into the damaged section and being inflated

Definitions

  • the invention relates to pipe liners.
  • a method of lining a pipe comprises forming a sleeve of reinforcing material for placement to surround a balloon of suitable material in use. applying resin to the sleeve, placing the sleeve and balloon in position within a pipe, allowing the resin to cure and to adhere the material of the balloon to the sleeve, and trimming off the exposed ends of the balloon.
  • a pipe lining comprises a reinforced resin-impregnated plastics sleeve with an inner surface formed of plastic sheet, which resin in the sleeve is cured in situ and the plastic sheet which was held in position against the sleeve during curing by fluid pressure and simultaneously adhered to the sleeve.
  • a sausage shaped balloon formed of polyurethane sheet is surrounded by a sleeve of woven glass mat.
  • the mat is soaked in epoxy resin and the balloon and sleeve towed along the inside of a pipe to a chosen position.
  • the balloon is then inflated with air and the resin allowed to cure at ambient temperature.
  • the air pressure inside the balloon is then released and the ends of the balloon trimmed off.
  • the remainder of the balloon forms an inner surface for the lining and is bonded thereto by the cured resin.
  • the glass mat may be towed into the pipe on its own and the balloon placed in the pipe after this has been completed.
  • the balloon material had to be stripped from the sleeve, adding to the costs.
  • the polyurethane lining improves the hydraulic efficiency of the finished lining.
  • Polyurethane and other materials that may be used in embodiments of this invention have high resistance to abrasion, that is much higher in general then reinforced plastics materials that can normally be used for the sleeve alone. Any glass fibres are maintained behind the polyurethane layer so that fibre foliation of the liner is no longer possible.
  • the balloon is made separately, its manufacturing specification can be carefully controlled and the performance of the finished lining more readily and effectively predicted and controlled. The described method is much less susceptible to producing creases where the liner is required to be formed at bends in . pipes.
  • an epoxy resin is used.
  • polypropylene to be used for the balloon and in the felts, for the liners which cannot be satisfactorily used with polyester resins, as are used in Insituform methods for example.
  • polyester resins require relatively high curing temperatures which considerably reduces the materials that can be used in combination.
  • an adverse cost factor which has probably discouraged the use of epoxy resins in present methods and apparatus.
  • the applicant has developed an approach based on the use of epoxy resin to carry out the invention and which enjoys several advantages. Apart from the lower curing temperature, there is now a wider choice of suitable co-operating materials for the liner and the balloon many of which are inherently stronger than hitherto possible.
  • the lining can also be thinner in practice and hence provide a saving in costs.
  • epoxy resin does not shrink, or shrinks very little during curing, the epoxy resin bonds well to the original pipe material in a way that polyester resin, which significantly shrinks, is unable to do.
  • the epoxy resin is inherently more expensive than the well-established practice of using polyester resins, the added cost is off-set by being able to use thinner liners and a wider range of materials. Because of the bond achieved between the epoxy resin and the original pipe, or remaining parts of it. wholly more satisfactory results are possible using methods of this invention.
  • EL60 solvent is used supplied by Borden (UK) Limited, together with EHR hardener from the same supplier.
  • the solvent contains dimethyl formamide which dissolves part of the outer surface of the balloon adjacent the glass mat and so that after curing the balloon is intimately bonded to the mat.
  • the woven mat may comprise needled felt or any other form of matrix material.
  • a felt liner may be inserted using the Insituform method in which the liner is prepared with the balloon outer most and urged into the pipe by water or air pressure from one end.
  • the liner then unfolds from its inside and about its leading end as it is forced into the pipe. Curing is then carried out by circulation of water within the balloon.
  • the hot water is preferably supplied through a perforated pipe, having 3mm holes at 1000 pitchings. which extends along the length of the pipe being lined. The hot water is flowed through the perforated pipe and as the water exits through the perforations an amount of turbulence is caused to ensure that the hot water is stirred fully within the liner.

Abstract

A pipe liner is formed in situ and consists of a reinforced resin impregnated sleeve having an inner plastics sheet, originally in the form of a balloon. The balloon is inflated once the sleeve is in position and while the resin is cured. An epoxy resin is used which binds the sheet to the sleeve so that the sheet forms the inner surface of the liner after curing the resin.

Description

A METHOD OF LINING A PIPE
The invention relates to pipe liners.
It is already well known to line pipes by making up a woven glass mat sleeve around an inflatable PVC balloon. The sleeve is soaked in resin and the balloon and sleeve towed into position within a pipe. The balloon is inflated in the resin and allowed to cure at ambient temperature. After curing the balloon is deflated and stripped from the sleeve which forms a permanent lining for the pipe.
According to one aspect of the present invention a method of lining a pipe comprises forming a sleeve of reinforcing material for placement to surround a balloon of suitable material in use. applying resin to the sleeve, placing the sleeve and balloon in position within a pipe, allowing the resin to cure and to adhere the material of the balloon to the sleeve, and trimming off the exposed ends of the balloon.
The suitable material for the balloon is any material which bonds to the chosen resin during curing. Preferably such material has a hard-wearing and smooth inner surface. According to another aspect of the invention a pipe lining comprises a reinforced resin-impregnated plastics sleeve with an inner surface formed of plastic sheet, which resin in the sleeve is cured in situ and the plastic sheet which was held in position against the sleeve during curing by fluid pressure and simultaneously adhered to the sleeve.
Methods of forming a pipe lining will now be described by way of example.
A sausage shaped balloon formed of polyurethane sheet is surrounded by a sleeve of woven glass mat. The mat is soaked in epoxy resin and the balloon and sleeve towed along the inside of a pipe to a chosen position. The balloon is then inflated with air and the resin allowed to cure at ambient temperature. The air pressure inside the balloon is then released and the ends of the balloon trimmed off. The remainder of the balloon forms an inner surface for the lining and is bonded thereto by the cured resin.
The glass mat may be towed into the pipe on its own and the balloon placed in the pipe after this has been completed. In the prior art methods, the balloon material had to be stripped from the sleeve, adding to the costs. Further, the polyurethane lining improves the hydraulic efficiency of the finished lining. Polyurethane and other materials that may be used in embodiments of this invention have high resistance to abrasion, that is much higher in general then reinforced plastics materials that can normally be used for the sleeve alone. Any glass fibres are maintained behind the polyurethane layer so that fibre foliation of the liner is no longer possible. As the balloon is made separately, its manufacturing specification can be carefully controlled and the performance of the finished lining more readily and effectively predicted and controlled. The described method is much less susceptible to producing creases where the liner is required to be formed at bends in . pipes.
It will be noted that in embodiments of the invention an epoxy resin is used. This enables polypropylene to be used for the balloon and in the felts, for the liners which cannot be satisfactorily used with polyester resins, as are used in Insituform methods for example. This is because polyester resins require relatively high curing temperatures which considerably reduces the materials that can be used in combination. There is however an adverse cost factor which has probably discouraged the use of epoxy resins in present methods and apparatus. Against this, the applicant has developed an approach based on the use of epoxy resin to carry out the invention and which enjoys several advantages. Apart from the lower curing temperature, there is now a wider choice of suitable co-operating materials for the liner and the balloon many of which are inherently stronger than hitherto possible. The lining can also be thinner in practice and hence provide a saving in costs. In addition, because epoxy resin does not shrink, or shrinks very little during curing, the epoxy resin bonds well to the original pipe material in a way that polyester resin, which significantly shrinks, is unable to do. Thus, although the epoxy resin is inherently more expensive than the well-established practice of using polyester resins, the added cost is off-set by being able to use thinner liners and a wider range of materials. Because of the bond achieved between the epoxy resin and the original pipe, or remaining parts of it. wholly more satisfactory results are possible using methods of this invention.
Thus, apart from providing a liner having characteristics which add to the integrity of in situ formed liners and overcoming the problem of the balloon or equivalent having to be removed after curing of the liner, and/or allowing parts of the liner to fall off in use, methods by using epoxy resins enable a wide range of materials to be chosen according to the requirements for the pipe liners required in practice.
In the described methods EL60 solvent is used supplied by Borden (UK) Limited, together with EHR hardener from the same supplier. The solvent contains dimethyl formamide which dissolves part of the outer surface of the balloon adjacent the glass mat and so that after curing the balloon is intimately bonded to the mat.
The woven mat may comprise needled felt or any other form of matrix material.
Further, a felt liner may be inserted using the Insituform method in which the liner is prepared with the balloon outer most and urged into the pipe by water or air pressure from one end. As is well-known in the basic Insituform method, or an improved method described for example in UK Patent Specifications 1563424, the liner then unfolds from its inside and about its leading end as it is forced into the pipe. Curing is then carried out by circulation of water within the balloon. The hot water is preferably supplied through a perforated pipe, having 3mm holes at 1000 pitchings. which extends along the length of the pipe being lined. The hot water is flowed through the perforated pipe and as the water exits through the perforations an amount of turbulence is caused to ensure that the hot water is stirred fully within the liner.

Claims

1. A method of lining a pipe comprising forming a sleeve of reinforcing material for placement to surround a balloon of suitable material in use. applying resin to the sleeve, placing the sleeve and balloon in position within a pipe, allowing the resin to cure and to adhere the material of the balloon to the sleeve, and trimming off the exposed ends of the balloon.
2. A method according to Claim 1, including using an epoxy resin.
3. A method according to Claim 2. including using a polypropylene balloon.
4. A method according to Claim 2 or 3. including using a polypropylene sleeve.
PCT/GB1989/001156 1988-09-30 1989-09-29 A method of lining a pipe WO1990003259A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8826829.7 1988-09-30
GB888826829A GB8826829D0 (en) 1988-09-30 1988-09-30 Pipe liners

Publications (1)

Publication Number Publication Date
WO1990003259A1 true WO1990003259A1 (en) 1990-04-05

Family

ID=10646969

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1989/001156 WO1990003259A1 (en) 1988-09-30 1989-09-29 A method of lining a pipe

Country Status (2)

Country Link
AU (1) AU4485889A (en)
WO (1) WO1990003259A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2335247A (en) * 1998-03-13 1999-09-15 Eric Frederick Joseph Crisp Pipe lining

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2912840A1 (en) * 1978-04-05 1979-10-11 Giuseppe Muscianese COVER FOR THE INTERNAL JOINT
GB2097892A (en) * 1981-05-01 1982-11-10 Uco Sa Nv Pipe lining method
EP0234142A1 (en) * 1985-12-27 1987-09-02 Société COOPETANCHE, S.A. Process for internally lining conduits

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2912840A1 (en) * 1978-04-05 1979-10-11 Giuseppe Muscianese COVER FOR THE INTERNAL JOINT
GB2097892A (en) * 1981-05-01 1982-11-10 Uco Sa Nv Pipe lining method
EP0234142A1 (en) * 1985-12-27 1987-09-02 Société COOPETANCHE, S.A. Process for internally lining conduits

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, Vol 7, No 126, M219, abstract of JP-A-58 045 022, (NIHON KANKENKOGYO K.K) publ 1983-03-16. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2335247A (en) * 1998-03-13 1999-09-15 Eric Frederick Joseph Crisp Pipe lining

Also Published As

Publication number Publication date
AU4485889A (en) 1990-04-18

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