System for pressure letdown of abrasive slurries

Details System for pressure letdown of abrasive slurries System for pressure letdown of abrasive slurries

1991-01-16

1991-10-01

Cohan, Alan

Fluid handling

Processes

Involving pressure control

137572, 137195, 137587, F17C 1300

Patent

active

050524267

ABSTRACT:
A system and method for releasing erosive slurries from containment at high pressure without subjecting valves to highly erosive slurry flow. The system includes a pressure letdown tank disposed below the high-pressure tank, the two tanks being connected by a valved line communicating the gas phases and a line having a valve and choke for a transfer of liquid into the letdown tank. The letdown tank has a valved gas vent and a valved outlet line for release of liquid. In operation, the gas transfer line is opened to equalize pressure between tanks so that a low level of liquid flow occurs. The letdown tank is then vented, creating a high-pressure differential between the tanks. At this point, flow between tanks is controlled by the choke. High-velocity, erosive flow through a high-pressure outlet valve is prevented by equalizing the start up pressure and thereafter limiting flow with the choke.

REFERENCES:
patent: 1386301 (1921-08-01), Adair et al.
patent: 1853474 (1932-04-01), Tucker
patent: 2502525 (1950-04-01), Krugler
patent: 2582819 (1952-01-01), Daily
patent: 3908718 (1975-09-01), Bower
patent: 4019524 (1977-04-01), Whitson

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