Importance

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Abstract

A thread form for a tubular connection between sections of large diameter pipe or casing having a pin member adapted to be made up with a box member, utilizing converging, trapped thread flanks and mating shoulders and end faces with dissimilar angles. The thread crests and roots make contact with each other before the thread flanks are touching. At final make-up, the thread flanks of the pin member are trapped by the thread flanks of the box member. The stab flanks assist the shoulders/end faces in resisting axial compressive loading. The different angles between the mating shoulders and end faces are such that the deformation of the shoulders upon axial compressive loading is less than the preferred maximum yield of the critical area. The amount of load bearing forces on the shoulders and end faces are predictable and can easily be controlled within the preferred axial deformation of the critical area.

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First Claim