GB2361199A - Repairing pipe joints - Google Patents

Repairing pipe joints Download PDF

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Publication number
GB2361199A
GB2361199A GB0008597A GB0008597A GB2361199A GB 2361199 A GB2361199 A GB 2361199A GB 0008597 A GB0008597 A GB 0008597A GB 0008597 A GB0008597 A GB 0008597A GB 2361199 A GB2361199 A GB 2361199A
Authority
GB
United Kingdom
Prior art keywords
needle
sealant
joint
hole
housing
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
GB0008597A
Other versions
GB2361199B (en
GB0008597D0 (en
Inventor
Anthony Frederick Douglas
Stanley John Peacock
Peter Michael Wardle
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.)
Chemence Ltd
Original Assignee
Chemence 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 Chemence Ltd filed Critical Chemence Ltd
Priority to GB0008597A priority Critical patent/GB2361199B/en
Publication of GB0008597D0 publication Critical patent/GB0008597D0/en
Publication of GB2361199A publication Critical patent/GB2361199A/en
Application granted granted Critical
Publication of GB2361199B publication Critical patent/GB2361199B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/18Appliances for use in repairing pipes

Abstract

The apparatus is for injecting a liquid settable settable sealant into a pipe joint through an aperture bored through a wall of the pipe and into the joint, the apparatus comprises a hollow needle having one end closed and the other end open for connection to a sealant supply pump, the needle having at least one hole in its wall to permit liquid sealant to be injected into the joint from the hole when the hole has been positioned within the joint and sealant is pumped along the needle from the open end to the closed end.

Description

2361199 Title: 1Lnprovements in I!Jecting a Liquid Sealant into a Pipe
Joint The present invention relates to injecting a liquid settable sealant into a pipe joint particularly a pipe joint containing a packing.
It is known to inject liquid settable sealants into the joints of fluid carrying pipes such as gas pipes or mains made of cast iron or steel in order to seal any leaks. In these types of pipes the joints are made between a spigot and a socket and any gap between the spigot and socket is sealed or closed by a packing which may be a traditional lead/yam packing or a rubber ring which may be lead or nylon tipped. Over time these packings shrink and gaps form between the packing and the spigot and/or socket providing leak paths for the gas.
In order to reseal the gaps, a technique has been developed using liquid settable sealants particularly anaerobic type methacrylate/acrylate sealants. In this technique a hole is drilled in the wall of the socket into the gap between the spigot and the socket and then the sealant is injected under pressure into the gap by way of the hole in the hope that either the hole communicates with the packing so that the sealant will come into immediate contact with the packing when injected into the packing and seal the leak paths when set or if not in contact with the packing the hole terminates close enough to the packing so that the sealant can flow along the gap towards the packing and into any leak paths formed between the packing and the spigot and/or socket where the sealant will set and seal the leak paths. Unfortunately it is not possible to know in advance the exact position of the packing within the joint and frequently by accident the hole is drilled too far away from the packing to enable the sealant to 1 reach the leak paths. In this case the process will have to be repeated, possibly more than once, before a successful seal is achieved.
It is therefore an object of the present invention to at least reduce the disadvantages of the known technique.
According to one aspect of the present invention, there is provided apparatus for injecting a liquid settable sealant into a pipe joint through an aperture bored through a wall of the pipe and into the joint, the apparatus comprising a hollow needle having one end closed and the other end open for connection to a sealant supply pump, the needle having at least one hole in its wall to permit liquid sealant to be injected into the joint from the hole when the hole has been positioned in the joint and sealant is pumped along the needle from the open end to the closed end with the hole within the joint.
According to another aspect of the present invention, there is provided apparatus for sealing with a settable liquid sealant a pipe joint containing a packing, the apparatus comprising means for injecting sealant into the joint but directly at the packing and a pump for connection to the injecting means for supplying the sealant to the injecting means.
In a preferred embodiment of the invention, the injecting means includes a hollow needle having one end closed and the other end open for connection to the sealant supply pump, the needle having at least one hole in its wall to permit liquid sealant to be injected into the joint from the hole when the hole has been positioned in the joint 2 and sealant is pumped along the needle from the open end to the closed end with the hole within the joint.
Suitably'a housing for the needle is provided, the housing being adapted for connection to the wall of the aperture in the pipe wall and for holding the needle in position during the injection of the sealant, the needle, in use, extending through a central bore in a body of the housing and into the pipe joint and the arrangement of the needle and the housing being such that the needle can be rotated axially within the body of the housing so that the needle hole can assume a desired position within the pipe joint.
Conveniently the housing includes means adapted to maintain a fluid-tight relationship between the housing body and the needle.
Preferably means are provided to permit the position of the needle within the joint to be ascertained externally of the housing body.
According to a yet another aspect of the present invention, a method is provided for sealing with a settable liquid sealant a pipe joint containing a packing, the method comprising injecting the sealant into the joint but directly at the packing.
An embodiment of the invention will now be particularly described with reference to the accompanying drawing which shows the apparatus shown partly in section in position and use on the wall of a pipe socket.
3 Referring to the drawing the apparatus comprises a hollow needle 1, a housing 2 for the needle 1 and a hand-pump 3 for pumping the liquid sealant to the needle 1.
The needle 1 comprises a hollow cylindrical shaft of steel with an open end 4 for connection to the hand-pump 3, a closed end 5 for location within the joint gap 6 formed between the socket 7 and spigot 8 of in this case a cast iron pipe joint and a hole 9 in the wall of the shaft to permit the egress of sealant from the needlel into the joint gap 6.
As shown, in use, the hole 9 in the needle 1 is positioned close enough to the closed end 5 so that when the latter is located within the joint gap 6 (as shown in the drawing) the hole 9 is also located within the joint gap 6 to permit the emission of liquid sealant as a spray 10 towards the joint packing 11 as shown in the drawing.
The housing 2 comprises a brass nipple 20 which has an externally threaded cylindrical portion 21 which in use as shown is screwed into a suitably already tapped and threaded aperture 22 in the socket, a flanged portion 23 to engage the surface of the pipe socket 7 and on the other side of the flanged portion a further externally threaded cylindrical portion 24 on which in use is screwed a cap 25 for reasons to be described.
Extending axially through the nipple body 26 is an axial bore 27 which has a cylindrical portion 28 adjacent to the portion 21 and the flanged portion 23 and an enlarged portion 29 adjacent to the portion 24. When the nipple 20 is in position in the pipe socket 7 as shown, a flirther cylindrical hole 30 is drWed through the wall of the 4 1 socket 7 as conventional to permit sealant to be injected into the joint gap 6 or in this case to permit the needle 1 to access the joint gap 6 as win be described. In the figure the hole 30 has already been drilled of course, the drill (not shown) in use passing through the bore 27 of the housing 2 and thence into the joint gap 6 through the socket wall.
The enlarged portion 29 of the bore 27 has a cylindrical portion 31 adjacent the cap end of the nipple 20 forming a chamber tapering towards the socket end of the nipple 20 and adjoining the narrower diameter portion 28 of the bore 27.
After assembly, the needle 1 extends with some clearance through the axial bore 27 of the nipple 20. The needle I is held rotatably and slidably in place in the nipple 20 in a fluid-tight manner by a ffiction grip device known as a friction sleeve assay 32 located in use in the chamber 3 1. The assay 3 2 comprises a cylindrical bush 3 3 of a flexible material like rubber and two metal washers 34 and 35 on either side of the bush 33. The needle 1 is caused to pass through the centre of the bush 33 in use and the bush 33 grips the needle 1 by being squashed radially inwardly between the washers 34 and 35 when the cap 25 referred to above is screwed onto the nipple 20 to engage and move the washer 34 towards the bush 33 which is prevented from downward movement by the other washer 35 held captive by the tapered portion 36 of the chamber 3 1. The grip exerted by the bush 3 3 is deliberately insufficient to prevent the needle 1 being axially rotated or slidably moved but the assay 32 and the cap 25 form with the needle 1 a gas-tight seal preventing the egress of any gas from the pipe joint by way of the axial bore 27 in the nipple 20.
Means are also provided to permit the position of the needle 1 and therefore the sealant injection hole 9 within the joint gap 6 to be ascertained externally of the joint gap 6, the means comprising a cylindrical brass bush 40 having a central axial bore through which the needle 1 passes and is secured to the bush 40 as for instance by bonding. This arrangement permits the needle 1 to be rotated by rotation of the bush 40. The external surface of the bush 40 is provided with a suitable mark such as a notched flat 43 shown schernatically in the drawing. This flat 43 is fined up vertically with the needle injection hole 9 before the needle 1 is inserted into the housing 2 so that in use with the flat 43 rotated to point towards the joint packing 11 the needle injection hole 9 within the joint 6 will also be pointing towards the packing 11.
Finally, a conventional hand pump or applicator 3 is provided to supply a suitable settable liquid sealant such as an anaerobic sealant of the methacrylate/acrylate type for instance any of the "ANACURE" (Trade Mark) range of sealants more particularly the ANACURE 2793 range provided by Chemence Ltd. of Corby, Northants, England. The applicator 3 has a flexible plastics supply tube 50 which is connected to the open end 4 of the needle 1 by means of a cylindrical clip 5 1. This is secured to the tube 50 and thence to the bush 40 by means of a cap 52, the latter being screw fitted to the bush 40 to hold the clip 51 in place by means of pins 53 extending radially from the clip 51 and held against the bush 40 by the cap 52. The applicator 3 is the subject of a UK Patent No. 2186544 where fiffi details of it and its operation will be found. The tube 50 is provided internally with a non-return valve (not shown) which permits the flow of sealant into the needle I but prevents its return to the applicator 3 as well as the flow of any residual gas upwardly through the housing 2.
6 To seal the joint gap 6, the socket 7 is first drilled and tapped normally at the 12 o'clock position as shown in the drawing to form the threaded aperture 22. Then the brass housing nipple 20 is screwed into the aperture 22 and the hole 30 is drilled through the wall of the socket 7. The bush 33 and two washers 34, 35 and the cap 42 are pre-assembled on the needle 1 and this is then inserted into and then through the axial bore 27 of the housing 2 and into the joint gap 6 until the closed end 5 of the needle 1 encounters the internal wall of the spigot 8. The needle 1 is then allowed to rest on the spigot 8. The position-indicating bush 40 is then slipped over the far end of the needle 1 and clipped thereto. The needle 1 is then rotated by the bush 40 until the notched flat 43 is pointing towards the joint packing 11. The needle injection hole 9 is now pointing towards the joint packing 11. The plastic tubing 50 from the applicator 3 is now secured to the open end 4 of the needle 1 and the sealant is pumped by hand to the needle 1 where it emerges from the needle injector hole 9 as a spray 10 to engage with and seal the leak paths in the packing 11.
7 1

Claims (9)

Claims
1. Apparatus for injecting a liquid settable sealant into a pipe joint through an aperture bored through a wall of the pipe and into the joint, the apparatus comprising a hollow needle having one end closed and the other end open for connection to a sealant supply pump, the needle having at least one hole in its wall to permit liquid sealant to be injected into the joint from the hole when the hole has been positioned within the joint and sealant is pumped along the needle from the open end to the closed end.
2. Apparatus for sealing with a settable liquid sealant a pipe joint containing a packing, the apparatus comprising means for injecting sealant into the joint but directly at the packing and a pump for connection to the injecting means for supplying the sealant to the injecting means.
Apparatus as claimed in claim 2 in which the injecting means includes a hollow needle having one end closed and the other end open for connection to the sealant supply pump, the needle having at least one hole in its wall to permit liquid sealant to be injected into the joint from the hole when the hole has been positioned within the joint and sealant is pumped along the needle from the open end to the closed end.
4. Apparatus as claimed in any of claims 1 to 3 in which a housing for the needle is provided, the housing being adapted for connection to the wall of the aperture in the pipe wall and for holding the needle in position during the injection of the sealant, the needle, in use, extending through a central bore in a body of the housing and into the 8 1 t pipe joint and the arrangement of the needle and the housing being such that the needle can be rotated axially within the body of the housing so that the needle hole can assume a desired position within the pipe joint.
5. Apparatus as claimed in claim 4 in which the housing includes means adapted to maintain a fluid-tight relationship between the housing body and the needle.
6. Apparatus as claimed in any of claims 2 to 5 in which means are provided to pern-fit the position of the needle within the joint to be ascertained externally of the housing body.
7. Apparatus substantially as hereinbefore described with reference to the accompanying drawing.
8. A method for sealing with a settable liquid sealant a pipe joint containing a packing, the method comprising injecting the sealant into the joint but directly at the packing.
9. A method substantially as hereinbefore described with reference to the accompanying drawing.
9
GB0008597A 2000-04-10 2000-04-10 Improvements in injecting a liquid sealant into a pipe joint Expired - Fee Related GB2361199B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0008597A GB2361199B (en) 2000-04-10 2000-04-10 Improvements in injecting a liquid sealant into a pipe joint

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0008597A GB2361199B (en) 2000-04-10 2000-04-10 Improvements in injecting a liquid sealant into a pipe joint

Publications (3)

Publication Number Publication Date
GB0008597D0 GB0008597D0 (en) 2000-05-31
GB2361199A true GB2361199A (en) 2001-10-17
GB2361199B GB2361199B (en) 2003-11-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB0008597A Expired - Fee Related GB2361199B (en) 2000-04-10 2000-04-10 Improvements in injecting a liquid sealant into a pipe joint

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GB (1) GB2361199B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009004303A1 (en) * 2007-06-29 2009-01-08 M W Polymer Products Ltd Sealing a leak in a pipe joint
WO2009103997A1 (en) * 2008-02-22 2009-08-27 Htc Management Serices Ltd. Method and apparatus for lining a conduit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1482200A (en) * 1974-11-19 1977-08-10 British Gas Corp Means for treating the inside of pipes under pressure
GB2223553A (en) * 1988-10-04 1990-04-11 British Gas Plc Repairing pipe joints
EP0555570A1 (en) * 1990-08-07 1993-08-18 Alh Systems Limited Sealing of pipes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1482200A (en) * 1974-11-19 1977-08-10 British Gas Corp Means for treating the inside of pipes under pressure
GB2223553A (en) * 1988-10-04 1990-04-11 British Gas Plc Repairing pipe joints
EP0555570A1 (en) * 1990-08-07 1993-08-18 Alh Systems Limited Sealing of pipes

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009004303A1 (en) * 2007-06-29 2009-01-08 M W Polymer Products Ltd Sealing a leak in a pipe joint
WO2009103997A1 (en) * 2008-02-22 2009-08-27 Htc Management Serices Ltd. Method and apparatus for lining a conduit
US20110024515A1 (en) * 2008-02-22 2011-02-03 Htc Management Services, Ltd. Method and apparatus for lining a conduit
JP2011514488A (en) * 2008-02-22 2011-05-06 エイチティーシー マネージメント サービシズ エルティディー. Conduit inner surface coating method and apparatus
AU2009216563B2 (en) * 2008-02-22 2014-01-16 Nu Flow Technologies 2020 Inc. Method and apparatus for lining a conduit
US8667925B2 (en) 2008-02-22 2014-03-11 Htc Management Services, Ltd Method and apparatus for lining a conduit
EA019870B1 (en) * 2008-02-22 2014-06-30 ЭйчТиСи МЕНЕДЖМЕНТ СЕРВИСИЗ ЛТД. Method and apparatus for lining a conduit

Also Published As

Publication number Publication date
GB2361199B (en) 2003-11-05
GB0008597D0 (en) 2000-05-31

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

Effective date: 20090410