Pipe joints or couplings – With assembly means or feature
Patent
1986-12-24
1988-08-02
Callaghan, Thomas F.
Pipe joints or couplings
With assembly means or feature
285 31, 285 93, 285 96, 285101, 285111, F16L 3500
Patent
active
047610239
ABSTRACT:
An improved telescoping joint suitable for use in repair of subsea pipelines including an inner tubular member, an outer tubular member for receiving the inner tubular member therein with an annulus between the members with seals establishing effective piston areas for extending the joint by causing relative extending movement between the members and relative retracting movement between the members, a pressure responsive locking piston for camming gripping elements into tight locking engagement between the members, and a pressure responsive piston and seal for providing a metal-to-metal seal between the members upstream of the extending piston area, the retracting piston area and the lock. Additionally a testing port is provide to establish the fluid tightness of the seal in the subsea location prior to the installation of the joint into the pipeline as a replacement for a damages section which has been removed. Both the lock and seal are releasable by reversing the application of fluid pressure to their pistons or piston areas.
REFERENCES:
patent: 3071188 (1963-01-01), Raulins
patent: 3097866 (1963-07-01), Iversen
patent: 3874706 (1975-04-01), Arnold
patent: 4078832 (1978-03-01), Wittman
patent: 4109945 (1978-08-01), Manchester et al.
patent: 4131287 (1978-12-01), Gunderson et al.
patent: 4178020 (1979-12-01), Dopyera
patent: 4200312 (1980-04-01), Watkins
patent: 4371198 (1983-02-01), Martin
patent: 4569540 (1986-02-01), Beson
Callaghan Thomas F.
Cameron Iron Works, Inc.
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