Couplings for standard A.P.I. tubings and casings and methods of

Details Couplings for standard A.P.I. tubings and casings and methods of Couplings for standard A.P.I. tubings and casings and methods of

1996-06-14

1997-11-25

Bryant, David P.

Metal working

Method of mechanical manufacture

Converting

2940705, 29450, 29456, B21K 2116

Patent

active

056898711

ABSTRACT:
A pipe coupling system including a modified collar (12) into which a first pipe (40) and a second pipe (30) are inserted. In a first embodiment, a ring (22) resides within the collar which can serve as a torque shoulder or a metal to metal seal. In a second embodiment, a composite element (22') is formed of three concentric rings, a first ring (41) being composed of a Teflon.RTM. like material, a second ring (44) being composed of a Torlon.RTM. or Peek.RTM. like material, and a third ring (42) composed of a Teflon.RTM. like material. The adjoining surfaces (60,61) of the rings (41,42,44) form leakage paths to relieve accumulated pressure within the collar thread voids (51). A slip on gauge (52) is disclosed for prescreening pipe to insure that it is within the tolerances required for the present system. A bucking plug (8) is disclosed for insuring that the first pipe (40) is inserted within the collar (12) to the proper depth.

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