EP0099898A1 - Sealing joints in pipes large enough in diameter for entry of personnel - Google Patents

Sealing joints in pipes large enough in diameter for entry of personnel

Info

Publication number
EP0099898A1
EP0099898A1 EP83900198A EP83900198A EP0099898A1 EP 0099898 A1 EP0099898 A1 EP 0099898A1 EP 83900198 A EP83900198 A EP 83900198A EP 83900198 A EP83900198 A EP 83900198A EP 0099898 A1 EP0099898 A1 EP 0099898A1
Authority
EP
European Patent Office
Prior art keywords
mould
joint
channel
diameter
sealant resin
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.)
Pending
Application number
EP83900198A
Other languages
German (de)
French (fr)
Inventor
David Macgregor Mills
Richard Walker Thomson
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.)
PRESS CONSTRUCTION Ltd
Original Assignee
PRESS CONSTRUCTION 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 PRESS CONSTRUCTION Ltd filed Critical PRESS CONSTRUCTION Ltd
Publication of EP0099898A1 publication Critical patent/EP0099898A1/en
Pending 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
    • F16L55/18—Appliances for use in repairing pipes
    • 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
    • F16L55/1645—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a sealing material being introduced inside the pipe by means of a tool moving in the pipe
    • F16L55/16455—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a sealing material being introduced inside the pipe by means of a tool moving in the pipe a part of the tool defining, together with the inner wall of the pipe, an enclosed space into which sealing material is injected

Definitions

  • This invention relates to a method of sealing in pipes large enough in diameter for entry of personnel, for example gas-main pipes.
  • An objection of the invention is to provide a method of sealing for example, large diameter gas-main pipe joints which reduces the amount of excavation necessary and thereby reduces the inconvenience to the public and traffic by making it unnecessary to excavate at each joint.
  • a method of sealing joints in pipes large enough in diameter for entry of personnel comprising the steps of providing an annular mould comprising edge portions and an intermediate portion having therein a shallow channel, extending longitudinally along one side, the mould being thick enough to prevent appreciable distension of the intermediate portion by injected sealant resin, applying the mould to the inner surfaces of the pipe ends on each side of the joint with the channel facing outwards and covering the joint, clamping the edge portions of the mould to the respective pipe ends by expanding bands applied internally of the fitted mould, injecting under pressure ' a sealant resin into the channel so as to fill the channel and any spaces in the joint, allowing the injected sealant resin to cure, and finally removing the bands and the. mould.
  • a release agent is applied to the surface of the channel.
  • the sealant becomes cured in the cross-sectional shape of a letter T, the arms of the T being the portion which filled the channel in the mould and the leg of the T being the portion which filled any spaces in the joint and extending radially outwards.
  • This cross-sectional shape has the advantage that the gas pressure in the pipe aids in maintaining the sealing of the joint in use.
  • Fig, 1 is a cross-section of a pipe at a joint showing how the sealant resin is applied
  • Fig. 2 is a section to an enlarged scale on line A-A in Fig. 1;
  • Fig. 3 shows, to the same scale as Fig. 2, a detail of the mould viewed in the direction of arrow B in Fig, 1, 'and
  • Fig. 4 to 7 are also to the same scale as Figs. 2
  • OMPI and 3 show. respectively a plan view of an expansion buckle of a clamping band, a side view of the buckle, a slotted lug fonning part of the buckle, and a section through the clamping band at the same location as Fig. 3.
  • a neoprene mould 1 is provided in the form of a strip.
  • the ends of the strip are shown in Fig. 3 with interengaging formations 2 and in Figs.
  • each band 4 is provided for use with the mould 1 . Details of the ends of each band 4 are shown in Figs. 4,5 and 6. Near one end of each band 4 an outstanding lug 5 is welded and apertured to receive a screw 6 which is threaded into a nut 7 welded to the lug 5. At the other end of each band 4 there are welded two out ⁇ standing lugs 8 provided with slots 9 for slidably receiving the end portion of the band beyond, the lug 5. Intermediate the ends of each band 4 there is welded an overlying lug 10 extending beyond one edge of the band.
  • a release agent is applied. o the channel
  • the mould 1 is applied in the form of an annulus to the inner surfaces of the pipe ends 11 and 12 • (see Fig. 2) on each side of the joint so that the channel faces outwards and covers the joint.
  • the ends of the mould are at the bottom.of the pipe.
  • the two bands 4 are then applied to the • respective edge portions of the mould 1 as shown in Fig. 2 and expanded by means of the screws 6 so as to clamp the edge portions of the mould 1 to the inner surfaces of the respective pipe ends 11 and 12.
  • the buckles are shown at the left hand side whereas the lugs 10 are at the bottom at the location of the ends of the mould 1.
  • a steel plate 13 is retained between the bands 4 by the lugs 10 and a rubber gasket 14 is retained between the plate 13 and the ends of the mould 1.
  • a sealant resin 15 is injected under pressure, via a valve 16 " through the mould 1 into the channel 3 so as to fill the channel 3 and any spaces in the joint.
  • An air release means 17 is provided at the top of Fig.
  • the operator can then move along inside the pipe to the next joint without the need for excavation at that joint. It is envisaged that excavation using the above method could be as far apart as 300 to 400 yards.
  • the mould 1 being in the form of a strip having ends, it can be made in the form of an annulus of a diameter substantially equal to the internal diameter of the pipe.
  • the mould 1 is thin enough for its flexibility to facilitate its application to the inner surface of the pipe ends 11 and 12 but thick enough to prevent appreciable distension by the injected sealant resin of the intermediate portion between the bands 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pipe Accessories (AREA)
  • Joints With Sleeves (AREA)
  • Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
  • Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)

Abstract

Dans un procédé permettant d'étanchéifier des joints de tube de conduite de gaz, un moule annulaire (1) est appliqué sur les surfaces internes des extrémités des tubes (11 et 12) de chaque côté du joint et recouvrant le joint. Les bords du moule sont bridés sur les extrémités respectives des tubes par expansion des bandes (4) appliquées à l'intérieur du moule et une résine d'étanchéité est injectée entre le moule et les surfaces internes des extrémités des tubes et dans tout espace formé dans le joint. On laisse durcir la résine d'étanchéité injectée et les bandes ainsi que le moule sont enlevés.In a method for sealing gas line tube joints, an annular mold (1) is applied to the inner surfaces of the ends of the tubes (11 and 12) on each side of the joint and covering the joint. The edges of the mold are clamped on the respective ends of the tubes by expansion of the bands (4) applied inside the mold and a sealing resin is injected between the mold and the internal surfaces of the ends of the tubes and in any space formed in the joint. The injected sealing resin is allowed to harden and the strips and the mold are removed.

Description

"Sealing Joints.- in- Pipes large- enough in diameter for * entry of personnel" •- .• •-. - ■ -.• • ■ • ■-. •
DESCRIPTION
This invention relates to a method of sealing in pipes large enough in diameter for entry of personnel, for example gas-main pipes.
When natural gas began to be used instead of town gas it wwas found that the extra dryness and higher pressures of natural gas caused the sisal, which acted as a seal at gas-main pipe joints to deteriorate more rapidly than was the case with town gas. Many sealing methods were proposed and were reasonably successful but with the large diameter mains it was found necessary - to excavate at each joint in order to seal the joint externally. One method of external sealing that was proposed involved the external application of a steel or canvas muff about the joint and to apply a sealant resin known under the trade name "Encapress" between the muff and the joint. It has also been proposed to seal internally using a rigid assembly of segmental parts which are expanded sealingly to engage the inside of the pipe and again to apply the sealant resin. This assembly remains in the pipe and is costly.
An objection of the invention is to provide a method of sealing for example, large diameter gas-main pipe joints which reduces the amount of excavation necessary and thereby reduces the inconvenience to the public and traffic by making it unnecessary to excavate at each joint. According to the invention there is provided a method of sealing joints in pipes large enough in diameter for entry of personnel, comprising the steps of providing an annular mould comprising edge portions and an intermediate portion having therein a shallow channel, extending longitudinally along one side, the mould being thick enough to prevent appreciable distension of the intermediate portion by injected sealant resin, applying the mould to the inner surfaces of the pipe ends on each side of the joint with the channel facing outwards and covering the joint, clamping the edge portions of the mould to the respective pipe ends by expanding bands applied internally of the fitted mould, injecting under pressure' a sealant resin into the channel so as to fill the channel and any spaces in the joint, allowing the injected sealant resin to cure, and finally removing the bands and the. mould.
Preferably, a release agent, is applied to the surface of the channel.
The sealant becomes cured in the cross-sectional shape of a letter T, the arms of the T being the portion which filled the channel in the mould and the leg of the T being the portion which filled any spaces in the joint and extending radially outwards. This cross-sectional shape has the advantage that the gas pressure in the pipe aids in maintaining the sealing of the joint in use.
An embodiment of the invention will now be described by way of example, with, reference to the accompanying drawings, in which:-
Fig, 1 is a cross-section of a pipe at a joint showing how the sealant resin is applied;
Fig. 2 is a section to an enlarged scale on line A-A in Fig. 1;
Fig. 3 shows, to the same scale as Fig. 2, a detail of the mould viewed in the direction of arrow B in Fig, 1, 'and
Fig. 4 to 7 are also to the same scale as Figs. 2
OMPI and 3 and show. respectively a plan view of an expansion buckle of a clamping band, a side view of the buckle, a slotted lug fonning part of the buckle, and a section through the clamping band at the same location as Fig. 3.
In the drawings, a neoprene mould 1 is provided in the form of a strip. The ends of the strip are shown in Fig. 3 with interengaging formations 2 and in Figs.
2 and 7 with a shallow channel 3 extending longitud- inally along one side. Provided for use with the mould 1 are two bands 4 of mild steel. Details of the ends of each band 4 are shown in Figs. 4,5 and 6. Near one end of each band 4 an outstanding lug 5 is welded and apertured to receive a screw 6 which is threaded into a nut 7 welded to the lug 5. At the other end of each band 4 there are welded two out¬ standing lugs 8 provided with slots 9 for slidably receiving the end portion of the band beyond, the lug 5. Intermediate the ends of each band 4 there is welded an overlying lug 10 extending beyond one edge of the band.
In use, a release agent is applied. o the channel
3 and the mould 1 is applied in the form of an annulus to the inner surfaces of the pipe ends 11 and 12 • (see Fig. 2) on each side of the joint so that the channel faces outwards and covers the joint. In Fig„ 1 the ends of the mould are at the bottom.of the pipe. The two bands 4 are then applied to the • respective edge portions of the mould 1 as shown in Fig. 2 and expanded by means of the screws 6 so as to clamp the edge portions of the mould 1 to the inner surfaces of the respective pipe ends 11 and 12. As shown in Fig. 1, the buckles are shown at the left hand side whereas the lugs 10 are at the bottom at the location of the ends of the mould 1. At this location a steel plate 13 is retained between the bands 4 by the lugs 10 and a rubber gasket 14 is retained between the plate 13 and the ends of the mould 1.
A sealant resin 15 is injected under pressure, via a valve 16" through the mould 1 into the channel 3 so as to fill the channel 3 and any spaces in the joint.
An air release means 17 is provided at the top of Fig.
1, i.e. substantially diametrically opposite the valve
16 f so that when the resin begins to emerge from the means 17 the operator knows that the resin has filled all the available spaces. The injected sealant resin is allowed to cure and finally the mould 1 and bands 4 are removed leaving a reliable seal.
The operator can then move along inside the pipe to the next joint without the need for excavation at that joint. It is envisaged that excavation using the above method could be as far apart as 300 to 400 yards. Instead of the mould 1 being in the form of a strip having ends, it can be made in the form of an annulus of a diameter substantially equal to the internal diameter of the pipe.
The mould 1 is thin enough for its flexibility to facilitate its application to the inner surface of the pipe ends 11 and 12 but thick enough to prevent appreciable distension by the injected sealant resin of the intermediate portion between the bands 4.
*ξ\_ ?.t
OMP

Claims

1. A method of sealing joints in pipes large enough in diameter for entry of personnel, comprising the steps of providing an annular mould comprising edge portions and an intermediate portion having therein a shallow- channel extending longitudinally along one side, the mould being thick enough to prevent appreciable distension of the intermediate portion by injected sealant resin, applying the mould to the inner surface of the pipe- ends on each side of the joint with the channel facing outwards and covering the joint, clamping the edge portions of the mould to the respective pipe ends by expanding bands applied internally of the fitted' mould, injecting under pressure a sealant resin into the channel so as to fill the channel and any spaces in the joint, allowing the injected sealant resin to cure, and finally removing the bands and the mould.
2. A method according to claim 1, wherein a release agent is applied to the surface of the channel.
3. A method according to claim 1 or 2 , wherein the mould is provided in the form of a strip the ends of which have interengageable formations.
4. A method according to claim 1 or 2 , wherein the mould is provided in the form of an annulus.
EP83900198A 1981-12-08 1982-12-06 Sealing joints in pipes large enough in diameter for entry of personnel Pending EP0099898A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8136998 1981-12-08
GB8136998 1981-12-08

Publications (1)

Publication Number Publication Date
EP0099898A1 true EP0099898A1 (en) 1984-02-08

Family

ID=10526452

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83900198A Pending EP0099898A1 (en) 1981-12-08 1982-12-06 Sealing joints in pipes large enough in diameter for entry of personnel

Country Status (4)

Country Link
EP (1) EP0099898A1 (en)
ES (1) ES518015A0 (en)
IT (1) IT1153373B (en)
WO (1) WO1983002144A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2267545A (en) * 1992-06-04 1993-12-08 Alh Syst Ltd Sealing of pipe joints
JP3783018B2 (en) * 2004-01-15 2006-06-07 株式会社三木製作所 Flexible joint fixing ring

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3267967A (en) * 1963-02-18 1966-08-23 Midland Nat Bank Pipe repair tool
US3960395A (en) * 1974-06-17 1976-06-01 Amerace Corporation Expansion clamp
US3951173A (en) * 1974-11-08 1976-04-20 Cherne Industrial, Inc. Method and apparatus for sealing large diameter pipes
US4067349A (en) * 1976-11-15 1978-01-10 Halliburton Company Packer for testing and grouting conduits

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8302144A1 *

Also Published As

Publication number Publication date
ES8400926A1 (en) 1983-11-16
IT8224628A0 (en) 1982-12-06
IT8224628A1 (en) 1984-06-06
IT1153373B (en) 1987-01-14
WO1983002144A1 (en) 1983-06-23
ES518015A0 (en) 1983-11-16

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE DE FR NL SE

17P Request for examination filed

Effective date: 19831205

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

RIN1 Information on inventor provided before grant (corrected)

Inventor name: MILLS, DAVID MACGREGOR

Inventor name: THOMSON, RICHARD WALKER