GB2243658A - Method of connecting a polymeric service pipe to a main - Google Patents

Method of connecting a polymeric service pipe to a main Download PDF

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Publication number
GB2243658A
GB2243658A GB9009809A GB9009809A GB2243658A GB 2243658 A GB2243658 A GB 2243658A GB 9009809 A GB9009809 A GB 9009809A GB 9009809 A GB9009809 A GB 9009809A GB 2243658 A GB2243658 A GB 2243658A
Authority
GB
United Kingdom
Prior art keywords
replacement
fitting
main
service pipe
pipe
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
GB9009809A
Other versions
GB9009809D0 (en
GB2243658B (en
Inventor
Derek Stoves
Peter Alan Couchman
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 GB9009809A priority Critical patent/GB2243658B/en
Publication of GB9009809D0 publication Critical patent/GB9009809D0/en
Publication of GB2243658A publication Critical patent/GB2243658A/en
Application granted granted Critical
Publication of GB2243658B publication Critical patent/GB2243658B/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
    • F16L55/179—Devices for covering leaks in pipes or hoses, e.g. hose-menders specially adapted for bends, branch units, branching pipes or the like
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3404—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint
    • B29C65/342—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5224—Joining tubular articles for forming fork-shaped connections, e.g. for making Y-shaped pieces
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Branch Pipes, Bends, And The Like (AREA)

Abstract

A polyethylene gas or water replacement pipe 18 is inserted through an existing metal pipe 14 and terminates in a connecting piece 80 having a lateral opening 82 within a fitting 12. There is no need to effect excavation to make a connection to a main 10 containing a polyethylene replacement main 16. A machine travels within the main and cuts an aperture opposite the entrance to the fitting. The machine inserts a polyethylene sleeve 86 and joins it to the connecting piece 80 by an electrofusion joint 88. Then the machine inserts a polyethylene plug 90 and joins it to the sleeve 86 by an electrofusion joint 92. Finally, the machine joins the plug 90 to the replacement main 16 by an electrofusion joint 94. In modifications, the connection is made by injecting material from the main to join the replacement pipe and drilling out a communicating passage; or the replacement pipe 18 reaches the main through an elbow and is secured by the machine to a plug. <IMAGE>

Description

METHOD OF CONNECTING A POLYXERIC SERVICE PIPE This invention relates to methods of connecting polymeric service pipes, such as for gas or water services.
The invention is applicable to connecting polymeric replacement service pipes, which are inserted in the original cast iron or steel service pipe connected to a cast iron or steel main pipe. The replacement service pipe is required to be connected to the polymeric main pipe.
The invention is also applicable to new polymeric service pipes which are to be connected to a polymeric main pipe which is either a replacement pipe within a cast iron existing main pipe or which is a main pipe not installed within an existing pipe. The new service pipe in this case will extend to the main pipe within a passage in the ground formed by a mole.
The object of the invention is to provide a method which does not require a manual excavation to expose the main pipe in the region of the connection to the service pipe.
According to the invention, a method of connecting a polymeric service pipe to a polymeric main pipe comprises making a connection between the service pipe and the wall of the main pipe around an aperture through the wall of the main pipe, the operations of making the aperture and the connection being performed from within the main pipe.
In that form of method, said connection may comprise injecting a material through said aperture and into a fitting to make a gas-tight or water-tight seal around said end of the replacement service pipe, and then drilling through the aperture to remove material from within the fitting and drilling radially through the wall of the replacement service pipe, the material also making a gas- tight seal with the replacement main around the aperture.
In another form of method said replacement service pipe has a tube connected to its end protruding into said fitting, the tube having a closed end in the fitting, said connection comprising a tubular section sealed at one end to the replacement main and surrounded by material injected from within the section and making a gas-tight seal around said replacement service pipe which is drilled radially when said material has set.
In another form of the method, the connection comprises a resin-impregnated collapsible sub-liner, one end being connected to the replacement service pipe, and a hollow polymeric plug which is joined to the replacement main by an electrofusion joint about said aperture and which extends into the fitting, the sub-liner then being inflated to force it to occupy the fitting and to pass through the plug and to protrude into the main and after curing of the sub-liner the protruding part is trimmed from the sub-liner in the main.
In another form of the method the replacement pipe at its end in the fitting has a lateral opening facing the aperture in the replacement main, said connection comprising a hollow polymeric plug which is joined by an electrofusion joint to the replacement main about said aperture and which extends into the fitting, the end of the plug within the fitting being joined to the replacement service pipe by an electrofusion joint about the lateral opening in the replacement service pipe.
In yet another form of the method the replacement service pipe at its end in the fitting has an open end, said connection comprising a hollow polymeric plug which is joined by an electrofusion joint to the replacement main about said aperture and which extends into the fitting, the plug adjacent its end within the fitting having a lateral opening into which the replacement pipe is inserted and is joined to the plug by an electrofusion joint.
In yet another form of the method said replacement service pipe terminates in the fitting in a polymeric connecting piece which has a lateral opening in the fitting, and said connection comprises a polymeric sleeve which extends into the fitting and overlaps the connecting piece and is joined thereto about the lateral opening by an electrofusion joint, and a hollow polymeric plug which overlaps the sleeve and is joined thereto by an electrofusion joint and the plug is joined to the replacement main about said aperture by an electrofusion joint.
In yet another form of method, the fitting is an elbow and said connection comprises a hollow polymeric plug which is joined by an electrofusion joint to the replacement main about said aperture and which extends into the fitting and which receives the end of the replacement service pipe to which it is joined by an electrofusion joint.
Several forms of the invention as applied to connecting a service pipe for natural gas will now be described with reference to the accompanying drawings, in which : Figures 1 - 8, which show various forms of completed replacement pipes, the figures showing the main, the fitting and the corresponding end of the pipe.
In Figure 1 there are shown the following principal features: a cast iron original gas main 10; a tee-fitting 12; an original cast iron service pipe 14; a polymeric replacement main 16 in the main 10; and a polymeric replacement service pipe 18.
The polymeric replacement main 16 and replacement service pipe 18 are of polyethylene. The lower end of the fitting 12 has been trimmed back by a grinding wheel or boring tool mounted on a machine (not shown) which travels along the main 10 but which forms no part of the present invention. One form of suitable machine is described in our co-pending application filed on the same day as the ( 90098'08.8# present application under reference ERS3239t. Trimming the fitting 12 has left a circular dwell at 20. After trimming the fittings in the main 10, the replacement main 16 is inserted. The machine is again deployed in the replacement main 16 to detect where the entrance to the fitting 12 is located. The machine then cuts a circular aperture 22 in the replacement main 16 at that location opposite the entrance to the fitting 12.
The replacement service pipe 18 in this example has a closed end 30 and is inserted through the open end of the disused original service pipe 14.
The machine is then used to inject material 32 through the aperture 22 to fill the tee fitting 12 and make a gas tight seal around the end of the replacement pipe 18.
Finally, the machine is used to drill through the aperture 22 to remove material from within the fitting 12 to form a bore 34 and to drill radially through the wall at 36.
Connection is thus made between the interior of the replacement main 16 and the interior of the replacement pipe 18.
The material injected fills the dwell 20 and forms a gastight seal with the replacement main 16 at that area and forms a gas-tight seal with the interior of the fitting 12.
In Figure 2 the machine is used to insert a hollow, polyethylene plug 40 which extends into the fitting 12 and which is joined to the replacement main 16 by an electrofusion joint formed about the aperture 42. The electrofusion joint is made by the machine and is preferably located at 44.
The replacement service pipe 18 is inserted through the existing pipe 14 and carries with it a collapsible subliner 46, for example collapsed and stored in the end portion of the pipe 18. The sub-liner 46 is attached to the pipe 18 by metallic bands 48. Reinforcement bands 50 are provided on the outside of the pipe 18.
When the pipe 18 has been inserted the collapsible subliner 46 is inflated and occupies the position shown, occupying the fitting 12 and protruding through the plug 40, including a part 52 which protrudes into the main 16.
When the sub-liner 46 has cured and formed a gas-tight seal to the plug 40 and fitting 12, the machine is used to trim the part 52 from the sub-liner 46. After this, a metallic band 54 is fitted into the sub-liner 46 within the plug 40 to retain the sub-liner 46.
In Figure 3 the replacement service pipe 18 has a lateral end opening 60 which faces the aperture 42. The plug 62 is longer and meets the replacement pipe 18. A polyethylene sleeve 64 makes up any gap between the two.
The machine is used to insert the plug 62 and the sleeve 64 and to make electrofusion joints between the replacement pipe 18 and the sleeve 64 or the plug 62, and between the plug 62 and the replacement main 16.
In Figure 4, the polyethylene plug 70 is longer still and has a closed end 72. The plug 70 is inserted and joined by an electrofusion joint to the replacement main 16, these operations being done by the machine. The plug 70 is drilled by a drill inserted in the original pipe 14 to form a lateral opening 74 in the wall of the plug 70. The replacement service pipe 18 is inserted and received in the opening and the machine is used to join them by means of an electrofusion joint.
Alternatively, the plug 70 has the lateral hole 74 in it from the start.
In Figure 5 the replacement service pipe 18 terminates in a polyethylene connecting piece 80 having a lateral opening 82 in the fitting 12. The end of the connecting piece 80 within the original service pipe 14 is shown at 84 and secured to the replacement pipe 18 by, say, a fusion bond. The machine is used to position a hollow polyethylene sleeve 86 overlapping the connecting piece 80 within the fitting 12. The machine joins the two parts by an electrofusion joint at 88.
The sleeve 86 is then joined to a short polyethylene plug 90 by the machine using an electrofusion joint at 92.
Finally, the plug 90 is joined to the replacement main 16 by an electrofusion joint at 94 also made by the machine.
In Figure 6 the fitting is an elbow 100. The machine is used to join a polyethylene plug 102 to the replacement main 16 by means of an electrofusion joint. The replacement service pipe 18 is pushed around the elbow 100 and is received in the plug 102. The machine is used to join the replacement pipe 18 to the plug 102 by means of an electrofusion joint at 104.
Figure 7 shows a modification of the embodiment shown in Figure 1. The new service pipe 18 is pushed through the bold service pipe 14 with preferably a metal (e.g. copper) tube 200 swaged onto the end of the pipe 18. The tube 200 has a closed end 202 and a protective guide 204 to protect the end of the pipe 18 from dirt as it is pushed through the original pipe 14. The tube 200 also has a segmented centraliser 206. A complete ring 208 is mounted on the pipe 18 near the swaged joint 210. The centraliser 206 and ring 208 may be made of plastic or rubber.
A robot machine in the main 10 locates the tee connection and drills the necessary hole at 212. A metal, telescopic, two-part, tubular section 214 is inserted through the hole 212 by the machine. The section 214 is, for example, made of copper and the telescopic action makes allowances for variations in the distance of the pipe 18 from the main 16. The section 214 is integral with a head 216, having an O-ring or lip seal 218, which engages and seals against the replacement main 16.
The section 214 has plastic or rubber segmented contralisers 220, 222 and a complete ring 224 adjacent the head 216.
The upper end of the section 214 has scalloped cut-outs at 230. A cartridge (not shown) is inserted in the section 214 and is a tight fit in the section 214. The machine inserts the cartridge and then actuates to eject sealant such as an epoxy resin filler upwards, which leaves the section 214 through the cut-outs 230. The epoxy filler fills the space within the tee-fitting as shown at 300 being retained by the ring 208 and the ring 224. The epoxy-filler 300 makes a gas-tight seal with the pipe 14 and the pipe 18 and also with the fitting 12 and the section 214.
Once the epoxy-filler 300 has set, a hole is drilled, by the machine, radially through the new service pipe 18, the cartridge having been removed and the drill gaining access through the hole 212 and the fitting 214.
Figure 8 shows a second modification of the embodiment shown in Figure 1. The new service pipe is pushed into place through the original service pipe as before and has the metal tube swaged to it as shown in Figure 7. It is omitted from Figure 8 for simplicity. The section 314 is shown and it is integral with an electro-fusion saddle fitting 316. The section 314 is inserted by the machine as before but the fitting 316 must be correctly oriented.
Epoxy resin sealant is injected from a cartridge, as before.
Although the foregoing examples have been described with reference to connection of a natural gas replacement pipe, the invention is equally applicable to new service pipes for gas or to the connection of replacement or new service pipes for water or other gases or fluids.
The fitting 12 or 100 described above can also be replaced by a straight fitting in some cases and the invention is still applicable in making a connection between the service pipe and the wall of the main pipe.

Claims (20)

1. A method of connecting a polymeric service pipe to a polymeric main pipe comprising making a connection between the service pipe and the wall of the main pipe around an aperture through the wall of the main pipe, the operations of making the aperture and the connection being performed from within the main pipe.
2. A method according to claim 1, an existing metal service pipe being connected at one end by a fitting to a metal main pipe containing a replacement main pipe of polymeric material and the existing metal service pipe is open at the other end, the method comprising inserting a polymeric replacement service pipe through said other end of said metal service pipe.
3. A method according to claim 2, said connection comprising injecting material through said aperture and onto the fitting to make a gas-tight or water-tight seal around said end of the replacement service pipe, and then drilling through the aperture to remove material from within the fitting and drilling radially through the wall of the replacement service pipe, the material also making a gas-tight seal with the replacement main around the aperture.
4. A method according to claim 2, said replacement service pipe comprising a tube connected to its end protruding into said fitting, the tube having a closed end in the fitting, said connection comprising a tubular section sealed at one end to the replacement main and surrounded by material injected from within the section and making a gas-tight or water-tight seal around said replacement service pipe which is drilled radially when said material has set.
5. A method according to claim 4, said section making a mechanical seal with the liner.
6. A method according to claim 4, said section being joined to the liner by an electrofusion joint about said aperture.
7. A method according to claim 2, said connection comprises a collapsible sub-liner, one end being connected to the replacement service pipe, and a hollow polymeric plug which is joined to the replacement main by an electrofusion joint about said aperture and which extends into the fitting, the sub-liner then being inflated to force it to occupy the fitting and to pass through the plug and to protrude into the main and after curing of the sub-liner the protruding part is trimmed from the sub-liner in the main.
8. A method according to claim 7, the sub-liner being connected to the replacement service pipe and to the plug by means of metallic bands.
9. A method according to claim 2, the replacement pipe at its end in the fitting having a lateral opening facing the aperture in the replacement main, said connection comprising a hollow polymeric plug which is joined by an electrofusion joint to the replacement main about said aperture and which extends into the fitting, the end of the plug within the fitting being joined to the replacement service pipe by an electrofusion joint about the lateral opening in the replacement service pipe.
10. A method according to claim 2, the replacement service pipe at its end in the fitting having an open end, said connection comprising a hollow polymeric plug which is joined by an electrofusion joint to the replacement main about said aperture and which extends into the fitting, the plug adjacent its end within the fitting having a lateral opening into which the replacement service pipe is inserted and is joined to the plug by an electrofusion joint.
11. A method according to claim 2, the replacement service pipe terminating in the fitting in a polymeric connecting piece which has a lateral opening in the fitting, and said connection comprises a polymeric sleeve which extends into the fitting and overlaps the connecting piece and is joined thereto about the lateral opening by an electrofusion joint, and a hollow polymeric plug which overlaps the sleeve and is joined thereto by an electrofusion joint and the plug is joined to the replacement main about said aperture by an electrofusion joint.
12. A method according to claim 2, the fitting being an elbow fitting, and said connection comprises a hollow polymeric plug, which is joined by an electrofusion joint to the replacement main about said aperture and which receives the end of the replacement service pipe to which it is joined by an electrofusion joint.
13. A method according to claim 2, substantially as hereinbefore described with reference to Figure 1 of the accompanying drawings.
14. A method according to claim 2 substantially as hereinbefore described with reference to Figure 2 of the accompanying drawings.
15. A method according to claim 2 substantially as hereinbefore described with reference to Figure 3 of the accompanying drawings.
16. A method according to claim 2 substantially as hereinbefore described with reference to Figure 4 of the accompanying drawings.
17. A method according to claim 2 substantially as hereinbefore described with reference to Figure 5 of the accompanying drawings.
18. A method according to claim 2 substantially as hereinbefore described with reference to Figure 6 of the accompanying drawings.
19. A method according to claim 2 substantially as hereinbefore described with reference to Figure 7 of the accompanying drawings.
20. A method according to claim 2 substantially as hereinbefore described with reference to Figure 8 of the accompanying drawings.
GB9009809A 1990-05-01 1990-05-01 Method of connecting a polymeric service pipe Expired - Fee Related GB2243658B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9009809A GB2243658B (en) 1990-05-01 1990-05-01 Method of connecting a polymeric service pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9009809A GB2243658B (en) 1990-05-01 1990-05-01 Method of connecting a polymeric service pipe

Publications (3)

Publication Number Publication Date
GB9009809D0 GB9009809D0 (en) 1990-06-20
GB2243658A true GB2243658A (en) 1991-11-06
GB2243658B GB2243658B (en) 1993-04-28

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GB9009809A Expired - Fee Related GB2243658B (en) 1990-05-01 1990-05-01 Method of connecting a polymeric service pipe

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9305359U1 (en) * 1993-04-08 1993-06-09 Dumser Metallbau GmbH, 6740 Landau Connecting pipe piece for a media-carrying pipe, such as a distributor connection valve for a heating circuit distributor
EP0674131A1 (en) * 1994-03-26 1995-09-27 STEHMEYER &amp; BISCHOFF GmbH &amp; Co. KG Tubular liner for lateral pipes
WO1996028685A1 (en) * 1995-03-09 1996-09-19 Trolining Gmbh Hat-shaped connection sleeve for house service connections in sewer pipes
WO1996037724A1 (en) * 1995-05-22 1996-11-28 British Gas Plc Method of installing pipes
EP0879987A1 (en) * 1997-05-12 1998-11-25 Anthony George Poole Method and apparatus for sealing branch connections of a lined conduit
WO2002055915A2 (en) * 2001-01-12 2002-07-18 Lattice Intellectual Property Ltd Lining of pipes

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2147966A (en) * 1983-09-28 1985-05-22 Ian Roland Yarnell Lining pipe connections

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2147966A (en) * 1983-09-28 1985-05-22 Ian Roland Yarnell Lining pipe connections

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9305359U1 (en) * 1993-04-08 1993-06-09 Dumser Metallbau GmbH, 6740 Landau Connecting pipe piece for a media-carrying pipe, such as a distributor connection valve for a heating circuit distributor
EP0674131A1 (en) * 1994-03-26 1995-09-27 STEHMEYER &amp; BISCHOFF GmbH &amp; Co. KG Tubular liner for lateral pipes
WO1996028685A1 (en) * 1995-03-09 1996-09-19 Trolining Gmbh Hat-shaped connection sleeve for house service connections in sewer pipes
WO1996037724A1 (en) * 1995-05-22 1996-11-28 British Gas Plc Method of installing pipes
US6171435B1 (en) * 1995-05-22 2001-01-09 Bg Plc Method of installing pipes
EP0879987A1 (en) * 1997-05-12 1998-11-25 Anthony George Poole Method and apparatus for sealing branch connections of a lined conduit
WO2002055915A2 (en) * 2001-01-12 2002-07-18 Lattice Intellectual Property Ltd Lining of pipes
WO2002055915A3 (en) * 2001-01-12 2003-10-16 Lattice Intellectual Property Lining of pipes
GB2372547B (en) * 2001-01-12 2004-09-15 Lattice Intellectual Property Lining of pipes

Also Published As

Publication number Publication date
GB9009809D0 (en) 1990-06-20
GB2243658B (en) 1993-04-28

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732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20050501