Threaded pipe joint having improved seal ring entrapment

Pipe joints or couplings – Particular interface – Tapered

Patent

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Details

285355, F16L 2500

Patent

active

050660527

ABSTRACT:
The box end of a threaded joint has an interior profile of an inwardly tapered threaded section, followed by a smooth sealing surface parallel to the longitudinal axis of the threaded joint, followed by an increased diameter seal ring groove, followed by an inwardly tapered smooth sealing surface. The pin end of the joint has an external torque shoulder, followed by an inwardly tapered threaded section, followed by a reduced diameter pipe dope reservoir, followed by an extrusion hump used to extrude a deformable seal ring used in the seal ring groove, followed by an inwardly tapered smooth sealing surface. When the threaded joint is fully made up, the entrapped seal ring has a primary metal-to-metal seal on its one side, formed by the mated smooth, tapered surfaces, and a secondary metal-to-metal seal formed by the extrusion hump and the surface above the seal ring groove.

REFERENCES:
patent: 4489963 (1984-12-01), Raulins et al.
patent: 4610467 (1986-09-01), Reimert
patent: 4671544 (1987-06-01), Ortloff
patent: 4865364 (1989-09-01), Nobileau

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