Patent ID: 6990718
Filing Date: 2006-01-31
Classification: F16L,Y10T

Abstract:
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.