Ram type blowout preventers

Details Ram type blowout preventers Ram type blowout preventers

1983-11-21

1985-06-18

Novosad, Stephen J.

Wells

Means for perforating, weakening, bending or separating pipe...

With disparate below ground feature

166323, 251 1A, E21B 3306

Patent

active

045236399

ABSTRACT:
There is disclosed a ram-type blowout preventer having shear rams and fluid operated actuators for the shear rams which are of such construction as to move the rams inwardly to shear a pipe with a first, relatively large force, and then further inwardly to close the rams with a second, relatively small force, and which also includes locking elements adapted to be moved into positions locking the rams in closed positions automatically in response to inward movement of the rams to closed positions following shearing of the pipe.

REFERENCES:
patent: 3941141 (1976-03-01), Robert
patent: 4076208 (1978-02-01), Olson
patent: 4290577 (1981-09-01), Olson
patent: 4305565 (1981-12-01), Abbe

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