Tubular pin configuration to prevent galling while ensuring seal

Details Tubular pin configuration to prevent galling while ensuring seal Tubular pin configuration to prevent galling while ensuring seal

1986-12-04

1988-04-12

Arola, Dave W.

Pipe joints or couplings

With lubrication

285328, 285333, 2853344, F16L 1500

Patent

active

047369671

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.

REFERENCES:
patent: 2893759 (1959-07-01), Blose
patent: 2992019 (1961-07-01), MacArthur
patent: 3224799 (1965-12-01), Blose et al.
patent: 3353850 (1967-11-01), Butz et al.
patent: 4623173 (1986-11-01), Handa et al.
Machine Data Handbook, 3d Edition, vol. 2, Machinability Data Center, 1980, pp. 18-3 through 18-19.
API Bulletin on Thread Compounds for Casing, Tubing and Line Pipe, American Petroleum Institute, API Bul. 5A2, 5th Ed., 4/1972.

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