Importance

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Abstract

An Integral Self-Swaging Threaded Tubular Connection to connect ends of plain-end pipe or the like without the use of a coupling is disclosed that may be selectively tightened to various positions of make-up to effect strength efficiencies up to 100% with respect to the pipe body. Tapered pin threads (62) are formed on tubular member (60) for sealing cooperation with box threads (63) formed on tubular member (61), the threads being dimensioned such that when they are screwed together power tight, the box is swaged outwardly to a first predetermined configuration as at (90) and the pin is swaged inwardly to a second predetermined configuration as at (91) such that pin wall (92) at the last engaged pin thread and box wall (93) at the last engaged box thread are substantially the same thickness as the nominal pipe wall (94), to thereby effect a full-strength connection.

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First Claim