Expansible chamber devices – With releasable stop or latch means to prevent movement of... – Includes interfitting parts engageable at plural positions...
Patent
1990-01-30
1991-06-25
Kwon, John T.
Expansible chamber devices
With releasable stop or latch means to prevent movement of...
Includes interfitting parts engageable at plural positions...
92 23, 92 27, 92 28, F15B 1526
Patent
active
050257080
ABSTRACT:
An improved blowout preventor actuator is provided for opening and closing a ram block within a blowout preventor body to control the flow of well fluid. The working or power piston within the actuator cylinder is provided with one or more axially extending cavities each for receiving a locking rod secured at one end to the cylinder head. To prevent inadvertent opening of the ram block, locking segments carried by the power piston repeatedly disengage one locking surface and re-engage an adjacent locking surface on the locking rods as the power piston and ram block secured thereto move to the ram closed position. To unlock the power piston from the locking rods, fluid pressure is applied to an unlocking piston which radially moves the locking segments out of engagement with the locking rods. The locking surfaces on the locking rods extend axially along a length which allows different ram blocks to be substituted for sealing with various diameter tubular members passing through the blowout preventors. The simple yet highly reliable technique for preventing opening of the BOP ram block increases safety and reduces manufacturing and operating costs.
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"Cameron Type U Blowout Preventers", pp. 1282 and 1283.
"MPL Automatic Ram Locking", pp. 4490 and 4491.
Smith Denzil B.
Whitby Melvyn F.
Baroid Technology Inc.
Kwon John T.
Ryznic John
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