Fail-safe blowout preventer

Details Fail-safe blowout preventer Fail-safe blowout preventer

1988-10-27

1989-10-31

Fox, John

Valves and valve actuation

Blow-out preventers

Radial reciprocating ram

92130A, 91415, F16K 3100

Patent

active

048772178

ABSTRACT:
A fail-safe mechanism for closing the rams in a conventional blowout preventer. The mechanism includes a ram shaft having an enlarged outer end that is exposed to well pressure which exerts a constant closing force. The closing force is opposed by a hydraulic fluid chamber which is evacuated in the event of fire, etc. A floating plug within the ram shaft helps prevent leaks of well fluid from the blowout preventer.

REFERENCES:
patent: Re18874 (1933-06-01), Abercrombie
patent: 3122065 (1964-02-01), Laun

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