GB2199386A - Sealing pipe joints - Google Patents

Sealing pipe joints Download PDF

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Publication number
GB2199386A
GB2199386A GB08630796A GB8630796A GB2199386A GB 2199386 A GB2199386 A GB 2199386A GB 08630796 A GB08630796 A GB 08630796A GB 8630796 A GB8630796 A GB 8630796A GB 2199386 A GB2199386 A GB 2199386A
Authority
GB
United Kingdom
Prior art keywords
interface
pipe
joint
catalyst
composition
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.)
Granted
Application number
GB08630796A
Other versions
GB2199386B (en
GB8630796D0 (en
Inventor
Denis Stephen Weeks
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.)
British Gas PLC
Original Assignee
British Gas PLC
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 British Gas PLC filed Critical British Gas PLC
Priority to GB8630796A priority Critical patent/GB2199386B/en
Publication of GB8630796D0 publication Critical patent/GB8630796D0/en
Publication of GB2199386A publication Critical patent/GB2199386A/en
Application granted granted Critical
Publication of GB2199386B publication Critical patent/GB2199386B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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
    • F16L55/164—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a sealing fluid being introduced in 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
    • F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
    • F16L55/179—Devices for covering leaks in pipes or hoses, e.g. hose-menders specially adapted for bends, branch units, branching pipes or the like

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Material Composition (AREA)
  • Pipe Accessories (AREA)

Abstract

A method for sealing the interface between the adjoining portions in a pipe joint 1a, the method comprising injecting into the pipe 3, 2a an anaerobically curable composition 15 in fluid form, transporting the fluid to the site of the joint 1a and allowing the composition to cure within the joint interface. <IMAGE>

Description

TITLE : SEALING A PIPE JOINT The present invention relates to sealing the interface between the adjoining portions of a pipe joint.
According to the present invention, there is provided a method for sealing the interface between the adjoining portions of a pipe joint, the method comprising injecting into the pipe an anaerobically curable monomer in fluid form, transporting the fluid to the site of the joint so that the monomer penetrates the joint interface and allowing the monomer to cure within the interface.
An embodiment of the invention will now be particularly described with reference to the drawings in which Figure 1 shows schematically the method being applied to the sealing of a screw threaded right angled pipe joint in a leaking gas service pipe and Figure 2 shows an exploded view of the joint after sealing.
A typical joint la to be sealed (see exploded view) is formed in a branch offtake 2a from a lateral service pipe 3 in say a block of flats. There may be a similar joint lb in an adjoining offtake 2b.
The joint la comprises a right angled joint formed by a vertical portion 4 of the branch 2a immediately adjoining the main pipe 3 and an adjoining horizontal portion 5. The pipe portions 4 and 5 are connected by means of an elbow 6 which is internally threa#ded to receive the externally threaded ends 7,8 of the pipe branch portions 4 and 5 respectively in vertical and horizontal portions 9,10 of the elbow 6.
A leak may occur at the interface between the ends of portions 4,5 and the elbow portions 9,10. In order to seal any leak, an anaerobic sealant monomer in fog form is allowed to penetrate the interfaces by the method to be described.
The sealant is initially in liquid form which may contain the monomer and a catalyst. A suitable compound is manufactured by Chemence Ltd.
and comprises a mixture of the monomer based on (meth) acrylate esters (eg. Anacure 2793 (Yellow) ) and a catalyst (eg. Anacure Accelerator) based on a transition metal.
Before operations commence the flow of natural gas along the service pipe 3 is ceased so that no gas is flowing in the branch offtakes 2a and 2b.
An air mover 13 of known type is connected to that end 14 of the service pipe 3 distant from the offtakes 2, the air mover 13 providing means by which the liquid sealant can be dispersed to form a fog of droplets. The liquid sealant is fed to the air mover as a stream 15 together with a draught of induced air 16. The air 16 causes the liquid sealant to atomise to-a droplet fog 17.
A second draught of air 18 applied to the air mover 13 induces the necessary draught of air to cause the droplet fog 17 to be transported along the service pipe 3 to the offtake 2.
After a time it will be found that some of the sealant fog will have penetrated the interface between the pipe portions 4 and 5 and the elbow-6.
Since these interfaces are very confined when filled with sealant there is little if any air present so that the sealant monomer will polymerise very -quickly sealing any leaks in the interface after it sets as shown at 19 and 20 in Figure 2.
Where-the joint being sealed is provided in a live gas main, the transporter gas may be the existing gas supply.
While the sealing of the interface in a screw threaded type joint has been shown, it is possible to seal other types of joints such as flanged joints and bell and spigot type joints which are caulked While the sealant described contains both a monomer and catalyst in admixture, it-would be possible to carry out the method in two stages in which in the first stage a catalyst present in a fog of a carrier such as a (meth) acrylate monomer is allowed to penetrate the joint interface and in the second stage the anaerobic composition as described previously is allowed to penetrate the interface.
Alternatively, the catalyst and the anaerobic composition may be simultaneously but separately injected into the pipe and transported to the site of the joint to penetrate the interface.
In another alternative the anaerobic composition may be injected into the pipe for transport to the site of the joint to penetrate the interface and then the catalyst may be injected into the pipe for similar transport to the site of the joint to penetrate the interface, the catalyst and anaerobic composition thereafter mixing in the interface to effect a cure.

Claims (11)

1. A method for sealing the interface between the adjoining portions in a pipe joint, the method comprising injecting into the pipe an anaerobically curable composition in fluid form, transporting the fluid to the site of the joint so that the composition penetrates the interface and allowing the product to cure within the joint interface.
2. A method as claimed in Claim 1 in which the anaerobic composition is in the form of a fog of fluid droplets.
3. A method as clai#med in Claim 2 in which the droplets are transported in a stream of gas.
4. A method as claimed in Claim 3 in which the gas is air.
5. A method as claimed in Claim 3 in which the transporter gas is the existing gas supply in a gas main.
6. A method as claimed in any of the preceding claims in which a catalyst is provided to promote the curing of the anaerobic composition.
7. A method as claimed in Claim 6 in which the catalyst is injected into the pipe and is transported to the site of the joint to penetrate the interface before the anaerobic composition is injected into the pipe, the anaerobic composition thereafter mixing with the catalyst within the interface.
8. A method as claimed in Claim 6 in which the catalyst is mixed with the monomer before the monomer is injected into the pipe.
9. A method as claimed in Claim 6 in which the catalyst and an anerobic composition are simultaneously but separately injected into the pipe and transported to the site of the joint to penetrate the interface.
10. A method as claimed in Claim 6 in which the catalyst is injected into the pipe and is transported to the site of the joint to penetrate the interface after the anaerobic composition has been injected into the pipe, the catalyst and the anaerobic composition thereafter mixing within the interface to effect a cure.
11. A method substantially as hereinbefore described with reference to the drawing.
GB8630796A 1986-12-23 1986-12-23 Sealing a pipe joint Expired - Fee Related GB2199386B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8630796A GB2199386B (en) 1986-12-23 1986-12-23 Sealing a pipe joint

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8630796A GB2199386B (en) 1986-12-23 1986-12-23 Sealing a pipe joint

Publications (3)

Publication Number Publication Date
GB8630796D0 GB8630796D0 (en) 1987-02-04
GB2199386A true GB2199386A (en) 1988-07-06
GB2199386B GB2199386B (en) 1991-01-02

Family

ID=10609534

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8630796A Expired - Fee Related GB2199386B (en) 1986-12-23 1986-12-23 Sealing a pipe joint

Country Status (1)

Country Link
GB (1) GB2199386B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2223551A (en) * 1988-10-04 1990-04-11 British Gas Plc Repairing pipe joints
GB2226865A (en) * 1988-12-12 1990-07-11 Chemence Ltd Lining pipes

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1325892A (en) * 1969-08-20 1973-08-08 Packo J J Method and compositions for sealing leaks
GB1378003A (en) * 1970-12-09 1974-12-18 Packo J J Sealing process
GB1460908A (en) * 1973-11-22 1977-01-06 British Gas Corp Apparatus for producing liquid fog or mist
GB1487206A (en) * 1975-05-08 1977-09-28 British Gas Corp Apparatus for producing a liquid fog or mist
GB1503024A (en) * 1976-10-29 1978-03-08 British Gas Corp Gas mains treatment
GB2080318A (en) * 1980-07-15 1982-02-03 Packo Joseph J Sealing Leaks by Polymerisation of Volatilised Aminosilane Monomers
GB2140530A (en) * 1983-05-23 1984-11-28 British Gas Corp Repairing leaks
GB2142707A (en) * 1983-05-18 1985-01-23 Continental Gummi Werke Ag A roller bellows for pneumatic vehicle suspensions
GB2159902A (en) * 1984-06-07 1985-12-11 British Gas Corp Sealing pipe joints
GB2159906A (en) * 1984-06-07 1985-12-11 British Gas Corp Sealing pipe joints
GB2160289A (en) * 1984-06-14 1985-12-18 British Gas Corp Spray-sealing of pipes

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2195416A (en) * 1986-09-13 1988-04-07 Btr Plc Internal surface treatment

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1325892A (en) * 1969-08-20 1973-08-08 Packo J J Method and compositions for sealing leaks
GB1378003A (en) * 1970-12-09 1974-12-18 Packo J J Sealing process
GB1460908A (en) * 1973-11-22 1977-01-06 British Gas Corp Apparatus for producing liquid fog or mist
GB1487206A (en) * 1975-05-08 1977-09-28 British Gas Corp Apparatus for producing a liquid fog or mist
GB1503024A (en) * 1976-10-29 1978-03-08 British Gas Corp Gas mains treatment
GB2080318A (en) * 1980-07-15 1982-02-03 Packo Joseph J Sealing Leaks by Polymerisation of Volatilised Aminosilane Monomers
GB2142707A (en) * 1983-05-18 1985-01-23 Continental Gummi Werke Ag A roller bellows for pneumatic vehicle suspensions
GB2140530A (en) * 1983-05-23 1984-11-28 British Gas Corp Repairing leaks
GB2159902A (en) * 1984-06-07 1985-12-11 British Gas Corp Sealing pipe joints
GB2159906A (en) * 1984-06-07 1985-12-11 British Gas Corp Sealing pipe joints
GB2160289A (en) * 1984-06-14 1985-12-18 British Gas Corp Spray-sealing of pipes

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2223551A (en) * 1988-10-04 1990-04-11 British Gas Plc Repairing pipe joints
GB2223553A (en) * 1988-10-04 1990-04-11 British Gas Plc Repairing pipe joints
US5156886A (en) * 1988-10-04 1992-10-20 British Gas Plc Method of sealing a discontinuity within a gas main
GB2226865A (en) * 1988-12-12 1990-07-11 Chemence Ltd Lining pipes

Also Published As

Publication number Publication date
GB2199386B (en) 1991-01-02
GB8630796D0 (en) 1987-02-04

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19991223