WO1995008736A1 - Joint d'etancheite pour derivation - Google Patents

Joint d'etancheite pour derivation Download PDF

Info

Publication number
WO1995008736A1
WO1995008736A1 PCT/GB1994/002063 GB9402063W WO9508736A1 WO 1995008736 A1 WO1995008736 A1 WO 1995008736A1 GB 9402063 W GB9402063 W GB 9402063W WO 9508736 A1 WO9508736 A1 WO 9508736A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipe
branch connection
collar
ferrule
stub
Prior art date
Application number
PCT/GB1994/002063
Other languages
English (en)
Inventor
Peter James Cahill
Original Assignee
North West Water Group 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 North West Water Group Plc filed Critical North West Water Group Plc
Publication of WO1995008736A1 publication Critical patent/WO1995008736A1/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
    • F16L41/00—Branching pipes; Joining pipes to walls
    • 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
    • F16L55/10—Means for stopping flow from or in pipes or hoses
    • F16L55/115—Caps
    • 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
    • F16L55/168—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe
    • F16L55/17—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe by means of rings, bands or sleeves pressed against the outside surface of the pipe or hose
    • F16L55/172—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe by means of rings, bands or sleeves pressed against the outside surface of the pipe or hose the ring, band or sleeve being tightened by a tangentially arranged threaded pin and a nut

Definitions

  • the present invention relates to a split collar and a method for sealing a leaking or disused branch connection connected to a pipe using such a split collar.
  • Split collars are well known for sealing circumferential and other cracks and holes in cast iron and asbestos-cement water mains.
  • Cast iron and asbestos-cement water mains can be of considerable age and over time can leak due to the effects of corrosion, ground movements, or traffic loading from the highway above.
  • This problem can be solved using a conventional split collar which is made up of two C-shaped components that may be bolted together around the leaking pipe using four or six bolts extending through flanges extending radially outwards from the sides of the C-shaped components.
  • branch connections from cast iron or asbestos cement water mains are generally formed from lead pipe connected to the cast iron main by an appropriate coupling, normally in the form of a right- angled bend, commonly known as a ferrule.
  • a ferrule normally in the form of a right- angled bend, commonly known as a ferrule.
  • leaks can occur at the ferrule position, either from the ferrule, from the lead pipe connected to it, or from the main at that position.
  • it is generally desirable to replace lead water pipes with plastics pipe and ideally this is done by drilling a hole into the cast iron or asbestos cement pipe at a point spaced from the original lead pipe ferrule and inserting a new ferrule into the drilled hole. This means that the existing lead pipe ferrule must be closed off in a reliable leak-proof manner.
  • a split collar for sealing a pipe comprising first and second components which may be assembled together to define an annulus extending around the pipe, and means for clamping the assembled components together, each component supporting sealing means which are compressed when the components are clamped together so as to prevent leakage of fluid from the portion of the pipe around which the collar is clamped, wherein the assembled components define a cavity which may be positioned so as to receive a branch connection extending from the pipe.
  • the cavity is defined by a casing formed in one of the components.
  • the casing may be offset relative to the annulus to enable it to receive an L-shaped connection.
  • the invention also provides a method for sealing a branch connection connected to a pipe, wherein the branch connection is severed at a point spaced from the pipe so as to leave a stub projecting from the pipe, and a collar is clamped onto the pipe so that the stub is enclosed within a cavity defined by the collar and sealed by engagement between the collar and the pipe.
  • the branch connection will generally be in the form of a ferrule from which a lead pipe extends.
  • a portion of the lead pipe is flattened to at least partially block the connection, and the flattened portion of the lead pipe is severed to define the stub.
  • a branch connection can be severed and sealed without making it necessary for the main pipe to be taken out of service.
  • Fig. 1 is a side view of one component of a split collar in accordance with a first embodiment of the present invention
  • Fig. 2 is a part sectioned view of the component of Fig. 1 taken in the direction of lines 2-2;
  • Fig. 3 is a partial view of the component of Fig. 1 taken in the direction of lines 3-3 in Fig. 1, the lines A-A in Fig. 3 representing the section shown in Fig. 1 and the lines B-B representing the section shown in Fig. 2;
  • Fig. 4 is a section through an installed split collar incorporating the component shown in Figs. 1 to 3.
  • Fig. 5 is an end view of the two components of a second embodiment of the invention, the two components being shown spaced apart;
  • Fig. 6, 7 and 8 are views of the lines 6-6, 7-7 and 8-8 of Fig. 5;
  • Fig. 9 is a section of the lines 9-9 of Fig. 5
  • the illustrated component comprises a generally C-shaped body 1 defining half of a tube split along the tube axis.
  • the body is provided with six bolt holes 2 spaced apart in two sets of three along each side.
  • a casing 3 in the form of a tube with a closed end extends radially outwards from the main body, defining a bell-shaped cavity.
  • the inner surface of the body 1 is grooved so as to provide semi ⁇ circular-shaped grooves 4 along each axial end of the body and straight grooves 5 along each side of the body. These grooves are provided to receive a closed-loop sealing gasket 6 (Fig. 4) which is a push fit in the grooves.
  • the illustrated component is in use bolted to a further component 7 (shown in Fig. 4).
  • the further component differs from the illustrated component only insofar as it is not provided with a cavity- defining casing but rather has a simple part-cylindrical outer surface.
  • the seals 6 provided in the grooves 4 and 5 are compressed, the portion of the seals in grooves 5 being compressed against each other, and the portion of the seals in grooves 4 being compressed against the outer surface of the pipe.
  • a closed space is defined between the split collar and that portion of the pipe about which it is fitted.
  • the cavity beneath the casing 3 forms part of this closed space. Accordingly the split collar can be positioned to receive a projection extending radially outwards from the pipe onto which the split collar is clamped.
  • the split collar can be used as shown in Fig. 4 to seal a branch connection 8 extending from a cast iron water main 9.
  • the branch connection 8 is shown schematically as a simple straight pipe extending directly from the main pipe 9.
  • the branch connection will generally be in the form of a ferrule mounted on the main pipe 9 and connected to a lead pipe.
  • the lead pipe can be hydraulically compressed to flatten it in a region say 10 to 15 cm away from the cast iron pipe.
  • the lead pipe can then be severed downstream of the flattened portion and the flattened portion can be folded over and crimped to provide a reasonably reliable temporary seal. This process can be carried out without it being necessary to take the cast iron pipe out of normal service.
  • a short stub of say 10 cm in length is left projecting from the cast iron pipe.
  • the component illustrated in Figs. 1 to 3 is then positioned over that stub so that the stub is received in the cavity defined by the casing 3.
  • the other half of the split collar is then secured to the casing-defining component by four or six bolts, and the bolts are tightened down until the resilient gaskets 6 supported by the two components provide a reliable seal. Any leakage which would otherwise occur from the severed end of the branch connection stub or the coupling between the branch connection stub and the cast iron pipe is thus prevented as a result of the cooperation between the split collar and the outer surface of the cast iron pipe.
  • the illustrated second embodiment of the invention is intended for use in circumstances where the branch connection is not in the form of a simple straight pipe extending radially from the main pipe. It is often the case that branch connections are in the form of an L-shaped ferrule one end of which is mounted on the main pipe to extend in the radial direction and the other end of which extends parallel to the main pipe and is connected to a lead pipe. Given an L-shaped ferrule, the cavity defined by the component illustrated in Figs. 1 to 4 would be too small to accommodate both the ferrule and a sealed lead pipe stub extending from the ferrule.
  • the embodiment of the invention illustrated in Figs. 5 to 9 defines a larger casing which is offset so as to accommodate such an assembly.
  • the illustrated split collar comprises a first C-shaped component 10 provided with four bolt holes 11 and grooves 12, 13 to receive seals of the type described with reference to Figs 1 to 4, and a second component 14 which includes a casing 15 that defines a cavity that is offset relative to the C-shaped pipe-gripping parts of the assembly.
  • the second component 14 is also provided with bolt holes 11 and grooves 12, 13.
  • the cavity defined by the casing 15 is sufficiently large to receive an L-shaped ferrule and a flattened lead pipe extending from the ferrule.
  • Fig. 5 shows in broken line the approximate position which would be assumed .by an L-shaped ferrule 16 and flattened lead pipe 17 if the component was mounted on a pipe from which the ferrule extends initially in a radial direction.

Landscapes

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

Abstract

Manchon (1) en deux pièces destiné à assurer l'étanchéité d'une dérivation (8) qui est raccordée à un conduit (2). La dérivation peut se présenter sous forme d'une bague depuis laquelle s'étend un conduit en plomb. Le conduit en plomb est aplati de manière à être partiellement bloqué, et ensuite la partie aplatie (17) est détachée de la dérivation de façon à définir un tronçon saillant depuis la bague. On serre un manchon en deux pièces sur le conduit de telle sorte que le tronçon et la bague soient enfermés à l'intérieur d'une cavité (3) définie par le manchon et dont l'étanchéité est assurée par contact entre le manchon et le conduit. Le manchon en deux pièces permet de constituer un montage permanent qui empêche toute fuite provenant du tronçon de la dérivation, de la bague, ou des fissures ou trous dans le conduit adjacent à la dérivation pouvant apparaître ultérieurement.
PCT/GB1994/002063 1993-09-25 1994-09-22 Joint d'etancheite pour derivation WO1995008736A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9319858.8 1993-09-25
GB9319858A GB2282425A (en) 1993-09-25 1993-09-25 Branch Connection Seal

Publications (1)

Publication Number Publication Date
WO1995008736A1 true WO1995008736A1 (fr) 1995-03-30

Family

ID=10742563

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1994/002063 WO1995008736A1 (fr) 1993-09-25 1994-09-22 Joint d'etancheite pour derivation

Country Status (2)

Country Link
GB (1) GB2282425A (fr)
WO (1) WO1995008736A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2146067A (en) * 1936-05-18 1939-02-07 Graham Harold Pipe coupling
US2999515A (en) * 1957-12-20 1961-09-12 John J Watson Pipe line leak clamp
US3861422A (en) * 1973-10-24 1975-01-21 Joe William Christie Split-sleeve pipe device
US4259981A (en) * 1979-09-24 1981-04-07 Busse Richard O Removable insulated valve cover

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1433423A (en) * 1973-07-02 1976-04-28 Btr Industries Ltd Method and apparatus for sealing leaking pipeline joints
GB1579022A (en) * 1977-02-25 1980-11-12 Avon Lippiatt Hobbs Ltd Sealing conduits
GB2011014B (en) * 1977-12-20 1982-03-31 British Gas Corp Method and apparatus for sealing of gas service pipes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2146067A (en) * 1936-05-18 1939-02-07 Graham Harold Pipe coupling
US2999515A (en) * 1957-12-20 1961-09-12 John J Watson Pipe line leak clamp
US3861422A (en) * 1973-10-24 1975-01-21 Joe William Christie Split-sleeve pipe device
US4259981A (en) * 1979-09-24 1981-04-07 Busse Richard O Removable insulated valve cover

Also Published As

Publication number Publication date
GB2282425A (en) 1995-04-05
GB9319858D0 (en) 1993-11-10

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