Pipe joints or couplings – Frangible element
Patent
1989-07-07
1992-10-27
Arola, Dave W.
Pipe joints or couplings
Frangible element
285 18, 285145, 285917, 285 93, F16L 37092
Patent
active
051583267
ABSTRACT:
A pipe connector including a main body having a stepped bore in one end for telescopic insertion over the end of a pipe, creating a stepped annular area around the pipe. A slip retaining nut is threaded into the end of the main body around the pipe, closing off the stepped annular area. Slips are carried in a tapered annular space between the nut and pipe. Prior to actuation, the slips are held up in disengaged position by shear pins. A pair of metal seal rings is disposed in the end of the stepped annular area opposite the nut. A pair of dual-acting, hydraulically actuated pistons is disposed in the stepped annular area between the metal seal rings and slips. Hydraulic pressure actuates the upper piston to move upwardly to energize the metal seals, and the lower piston to move downwardly to actuate the slips into gripping engagement with the pipe. Floating, self-centering lock ring segments are wedged between the pistons by lockdown screws to prevent the pistons from backing out of energizing engagement with the metal seal rings and slips. The connector may be released by backing out the lockdown screws which retracts the lock ring segments, unscrewing the slip retaining nut and removing it and the slips, pulling out the lower and upper pistons, and sliding the main body off the pipe. The metal seals may then be replaced along with the elastomer seals or slips, as needed.
REFERENCES:
patent: 2761704 (1956-09-01), Crawford
patent: 3130987 (1964-04-01), Johnson
patent: 3711123 (1973-01-01), Arnold
patent: 4006921 (1977-02-01), Mohr
patent: 4109940 (1978-08-01), Reneau
patent: 4650225 (1987-03-01), Le
patent: 4720125 (1988-03-01), Reneau
Anderson Alfred L.
Sanchez Christopher G.
Arola Dave W.
Blish Nelson
Cooper Industries Inc.
Rose David A.
Shull William E.
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