High pressure seal arrangement

Details High pressure seal arrangement High pressure seal arrangement

1993-05-18

1995-05-02

Arola, Dave W.

Pipe joints or couplings

With lubrication

285106, 285108, 285111, 285276, 285330, F16L 700

Patent

active

054112982

ABSTRACT:
A fluid swivel is described, of the type that carries oil, water or natural gas at high pressure between an undersea well and a weathervaning ship, which has a seal device of increased lifetime. The seal device (56, FIG. 2 ) lies in a cavity of a first swivel part (12) and includes a rigid seal ring (62) that is slidable toward and away from a sealed surface (66). A deformable seal (60) can be backed up by the seal ring, with the seal ring sliding to close the extrusion gap (70) into which the seal could extrude when high pressure fluid enters the swivel. A pressure source (80) coupled to the cavity urges the backup part to deform radially and slide toward the sealed surface with a force that increases as the pressure of fluid in the swivel increases. Both upstream and downstream ends (89, 99) of the seal ring are closely guided in movement toward and away from the sealed surface, and/or the dynamic side of the seal ring lies closely adjacent to the sealed surface at both its upstream and downstream end portions (180, 194, FIG. 9 ). The seal device can include only the more rigid seal ring (284, FIG. 12 ). The sealed surface (162, FIG. 8 ) can lie on the outer swivel part, with the seal ring being forced by fluid pressure to expand in diameter, rather than contract.

REFERENCES:
patent: 3884511 (1975-05-01), Hermonson
patent: 4555118 (1984-11-01), Saliger
patent: 4602806 (1986-07-01), Saliger
patent: 4647076 (1987-03-01), Pollack et al.
patent: 4669758 (1987-06-01), Feller et al.
patent: 4781404 (1988-11-01), Tharp et al.
patent: 4828292 (1989-05-01), Jansen
patent: 4925219 (1990-05-01), Pollack et al.

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