Heave compensating devices for marine use

Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy

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91390, 175 24, 254172, F15B 102

Patent

active

039465594

ABSTRACT:
A heave-compensating device particularly for floating oil drilling rigs incorporates a passive load-supporting system capable of being set to exert a chosen datum load-supporting force and an active force-modifying system operative when the force exerted by the passive load supporting system deviates from the chosen datum force to reduce the deviation. The passive load-supporting system may include a cylinder and piston assembly connected between a fixed support to which said system is connected and the load. The end of the cylinder adjacent the load is connected to a supply of liquid and to one end of a dashpot cylinder containing a piston, the other end of the dashpot cylinder being connected to a supply of compressed gas. The force-modifying system may incorporate a pressure sensor device in operative connection with both ends of the dashpot cylinder and controllingly connected to a pump alternatively connectible by valve means to opposite ends of a servo cylinder containing a piston connection to the piston of the dashpot cylinder.

REFERENCES:
patent: 3158206 (1964-11-01), Kammerer
patent: 3208728 (1965-09-01), Parks
patent: 3653635 (1972-04-01), Bates et al.
patent: 3687205 (1972-08-01), Mori
patent: 3718316 (1973-02-01), Larralde et al.
patent: 3793835 (1974-02-01), Larralde
patent: 3871622 (1975-03-01), Larralde et al.

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