| 主权项 |
1. A method for closing and sealing the opening of an open end of a pipe in preparation for fluid pressure testing of the pipe, said pipe end having a side wall, internal and external surfaces, a bore and an end face, comprising:
positioning an external clamp around and in contact circumferentially with the external surface, said clamp having cooperating, contacting, oppositely oriented ramped surfaces; positioning an internal clamp within the bore and in contact circumferentially with the internal surface, said clamp comprising an axially movable backplate at its rear end, cooperating, contacting, oppositely oriented ramped surfaces and an annular, deformable, resilient sealing member between the backplate and the front portion of the internal clamp; so that the clamps are aligned in opposed relation on the pipe end; positioning a clamping plate across the pipe opening so that it abuts the pipe end face; connecting the external clamp with the clamping plate with threaded nut and bolt assemblies and using said assemblies to urge said clamp toward said plate so that the ramped surfaces of said clamp cooperate to cause the clamp to radially and inwardly compress against and frictionally engage the external surface of the pipe end; connecting the backplate with the clamping plate with threaded nut and bolt assemblies and using said assembles to urge said backplate toward the clamping plate so as to compress and deform the sealing member into sealing engagement with the internal surface of the pipe end and simultaneously actuate the ramped surfaces of the internal clamp to cooperate and cause said internal clamp to radially and outwardly compress against and frictionally engage the internal surface of the pipe end; whereby the backplate, clamping plate and sealing member combine to close and seal the opening and the internal and external clamps clamp onto the pipe end. |
