| 摘要 |
<p>A split coupling for repairing, hot tapping, or joining pipelines, and particularly underwater pipelines, is disclosed. The coupling comprises a pair of members each having semicylindrical inner surfaces and a pair of faces adapted to oppose the faces of the other member. A first gasket continuously extends circumferentially on each semicylindrical surface and along the faces, with the face extending portion of each first gasket being adapted to mate with the face extending portion of the other first gasket. A second gasket is spaced from each first gasket. Each second gasket continuously extends circumferentially on each semicylindrical surface and along the faces with the face extending portion of each second gasket being adapted to mate with the face extending portion of the other second gasket. Ports are drilled through the coupling and into a zone defined by the first and second gaskets. When the coupling is applied to a pipeline, a seal is effected by at least the outermost gasket to block pipeline leakage within the innermost gasket. The gaskets, however, are designed to retain pressure in the zone so that the zone may be pressurized through the ports to pressure-test the seal effected by at least the outermost gasket.</p> |
