Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1985-11-29
1988-01-19
Schwadron, Martin P.
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
73714, 73756, 1372361, 137495, 137526, 166335, F16K 1712
Patent
active
047199377
ABSTRACT:
A marine riser anticollapse valve is disclosed for preventing a marine riser from collapsing under external sea water pressure in the event of a sudden loss of internal drilling fluid pressure. An external valve structure is provided for each of a plurality of openings in the wall of a riser pup joint. Each of the valve structures includes a cylinder having an opening in communication with a body wall opening. A piston in each cylinder is subject to sea water pressure but is prevented from opening when riser bore pressure of a sufficient magnitude is applied internally to the piston via the pup joint opening and cylinder opening. When the riser bore pressure falls, the piston is driven to an open position allowing sea water to enter the riser.
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Vetco Offshore Inc advertisement in "Composite Catalog published by World Oil (1978-1979), p. 6857.
Alexander Gabriel G.
Roche Joseph R.
Hepperle Stephen M.
Hydril Company
Schwadron Martin P.
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