Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Submerging – raising – or manipulating line of pipe or cable...
Patent
1992-05-29
1994-03-15
Taylor, Dennis L.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Submerging, raising, or manipulating line of pipe or cable...
4051951, 166267, F16L 100
Patent
active
052942147
ABSTRACT:
Large gas pockets in a crude oil transfer pipeline are detected and separated. As a large gas pocket forms, the liquid level drops (and the hydraulic head declines) in the export riser portion of the transfer pipeline, increasing the pressure required to transfer the fluid. Detection of the lower level and separation decreases the pressure required. Smaller gas pockets, which can be swept down the export riser portion, are not separated. The detecting and separating functions can be combined in a float-type gas vent valve, or separate gas detectors and gas vent valves can be used. The separated gas can be recombined with the crude oil, or used at an import platform, or separately transported to an on-shore facility. If the separated gas requires pressurization, a compressor-expander may be used to compress gas for flow in one direction and recover power from the expanding gas during flow in the other direction.
REFERENCES:
patent: 4133181 (1979-01-01), Kotcharian
patent: 4251361 (1981-02-01), Grimsley
patent: 4778306 (1988-10-01), Anselmi et al.
patent: 4887931 (1989-12-01), Frisby et al.
patent: 4982794 (1991-01-01), Hovot
Armstrong Float Type Air and Gas Vents, Bulletin No. 451-A, Aug. 1990.
Armstrong Float Type Liquid Drainers, Bulletin No. 401E, 20M Nov. 1983.
Jacobson William O.
McBee J. Russell
Taylor Dennis L.
Union Oil Company of California
Wirzbicki Gregory F.
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