A method for securing a branch assembly to a pipeline includes positioning a first containment ring surrounding an area from which the branch is to extend, positioning a first annular seal within the containment ring to provide a first ring/seal arrangement, positioning a second containment ring spa
A method for securing a branch assembly to a pipeline includes positioning a first containment ring surrounding an area from which the branch is to extend, positioning a first annular seal within the containment ring to provide a first ring/seal arrangement, positioning a second containment ring spaced from the first containment ring and first annular seal, positioning a second annular seal within the second containment ring to provide a second ring/seal arrangement, positioning the second part of the branch assembly onto the seals, and positioning a first part of the assembly on the pipe line and securing the first and second parts together so as to leave an annular gap between the first and second ring/seal arrangements and to provide an access point or vent in the second part communicating with the annular gap.
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What is claimed is: 1. A method for securing a branch assembly to a pipeline, wherein the branch assembly comprises a first part for locating on a side of the pipeline remote from a side from which the branch is to extend, and a second part incorporating the branch, the method comprising: positioni
What is claimed is: 1. A method for securing a branch assembly to a pipeline, wherein the branch assembly comprises a first part for locating on a side of the pipeline remote from a side from which the branch is to extend, and a second part incorporating the branch, the method comprising: positioning a first containment ring on the pipeline at a required position on the pipeline and surrounding an area from which the branch is to extend, positioning a first annular seal on the pipeline so that the seal is wholly radially within the containment ring to provide a first ring/seal arrangement, positioning a second containment ring on the pipeline spaced from the first containment ring and first annular seal, positioning a second annular seal on the pipeline so that the second seal is wholly radially within the second containment ring to provide a second ring/seal arrangement, positioning the second part of the branch assembly onto the seals, and positioning the first part of the assembly on the pipe line and securing the first and second parts together so as to compress the seals and leave an annular space between the first and second parts and the external surface of the pipeline, and to leave an annular gap between the first and second ring/seal arrangements, providing an access point or vent in the second part communicating with the annular gap. 2. A method as claimed in claim 1, wherein the first part forms a lower part of the assembly and second part forms an upper part of the assembly. 3. A method as claimed in claim 1, wherein the annular seals are made of rubber or of a polymer and metal composite. 4. A method as claimed in claim 1, wherein grout is injected into the annular space between the first and second parts and the external surface of the pipeline. 5. A method as claimed in claim 1, wherein jacking means are employed to space the first part from the pipeline when the first and second parts have been secured together on the pipeline. 6. A method as claimed in claim 5, in which the jacking means is hydraulically operated. 7. A method as claimed in claim 6, in which the jacking means comprises a plurality of jacking members slidably mounted in apertures in the first part and pressure-applying means mounted with respect to the first part and behind the jacking members and being urgable under hydraulic pressure against the jacking members to cause the jacking members to be urged towards the pipeline to positions to space the first part from the pipeline. 8. A method as claimed in claim 7, in which the jacking members are slidably mounted in bosses secured or fixed to the first part, and the pressure-applying members are also slidably mounted in the bosses or the like. 9. A method as claimed in claim 7 or 8, in which when the jacking members are in position spacing the first part from the pipeline, stop means are fixed in position with respect to the first part to prevent the jacking members moving away from the pipeline. 10. A method as claimed in claim 7 or 8, in which the pressure-applying means are removably mounted with respect to the first part, and the stop means are adapted to occupy the positions occupied by the pressure-applying means when the latter are removed. 11. A method as claimed in claim 10, in which the stop means are screwed into position in threaded supporting members fixed to the first part. 12. A method as claimed in claim 11, in which one or more load bearing members are positioned between the pipeline and the jacking members to spread the applied load when the jacking members are in position spacing the first part from the pipeline. 13. A method as claimed in claim 12, in which the load bearing members are in the form of enlarged feet on the jacking members. 14. A method as claimed in claim 13, in which the surfaces of the feet generally correspond to the profile of the pipeline. 15. A method as claimed in claim 12, in which the load bearing members are secured to the pipeline in positions so that they will be engaged or contacted by the jacking members. 16. A method as claimed in claim 1, further comprising providing sealing means for substantially preventing grout from escaping from the annular space, and introducing into the annular space grout that cures to bond the branch assembly in position on the pipeline. 17. A method as claimed in claim 1, wherein the access point or vent allows monitoring of the pressure in the annular gap to check for seal integrity.
Wartel Christian,FRX ; Pfeiffer Dominique,FRX ; Le Cointe Patrick,FRX, Method and apparatus for installing a branch connector from the top of an excavation.
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