Importance

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Abstract

A tubular connection includes a shallowly tapered conical sealing surface. The areas on the pin member where make up and sealing respectively occur in the various embodiments comprise multiple angles and surface texturing for the purpose of lubricant retention, facilitate burnishing and reduce the propensity for galling in multiple make up and break out situations. The pin taper in each case is slightly less than the box taper. The area on the pin member is textured ahead of the very smooth seal area to retain some thread compound even after repeated makeups of the connection. The area ahead of the sealing area where stabbing contact is made is textured in the 125-250 R.sub.a range while the smooth seal area is textured about 63 R.sub.a to provide a gas tight seal under high pressure and severe conditions of combined loads and thermal shock. Hence, the invention allows the use of a smoother seal surface for high temperature gas tight integrity than would otherwise be achieved after the connection is subjected to repeated make ups and break outs.

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First Claim