Fluid swivel seal arrangement

Details Fluid swivel seal arrangement Fluid swivel seal arrangement

1992-02-26

1993-09-07

Moore, Richard E.

Pipe joints or couplings

With leakage or drip disposal

F16L 1700

Patent

active

052421988

ABSTRACT:
A fluid swivel, of the type that carries oil, natural gas, or other fluid between an undersea well or pipeline and a weathervaning ship, wherein the seal arrangement that prevents leakage of fluid is constructed to increase the seal lifetime and reduce the cost of the fluid swivel. The seal arrangement includes a recess (44, FIG. 2) in a first of the swivel parts and a seal assembly (46) therein which includes a pressure seal (50) and a backup ring (56). The backup ring has a dynamic side (64) lying adjacent to the portion (54) of the second swivel part that is sealed against, and has an opposite distal edge portion (72). The dynamic side of the backup ring has a tapered downstream portion (80) that is tapered at an angle A of no more than 30.degree. to the axis of rotation (16) of the fluid swivel, with the downstream edge (82) of the tapered portion lying on a downstream wall (86) of the first swivel part rather than overhanging it. A drain conduit (90) is provided to drain fluid from the distal side (66) of the backup ring to the dynamic side 64 to prevent a substantial pressure difference across it. The distal edge portion (72) of the backup ring is closely received in a slot (70) of the first swivel part to slide therein, and an O-ring (74) lies at the bottom of the slot to bias the backup ring out of the slot.

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