Title: Heave compensation apparatus for a marine mining vessel

Abstract: A ship in which a string of heavy pipe is raised or lowered vertically beneath the ship at a substantially constant velocity in spite of heaving movement of the ship. The equipment for raising and lowering the pipe string is supported by the vessel through heave compensation means that permits vertical movement of the ship relative to the pipe raising and lowering mechanism. The heave compensation means is a passive damped pneumatic-hydraulic spring system for isolating the vertical movement of the ship from the pipe raising and lowering equipment. The spring system operates over a very wide range of load imposed by the raising, lowering and supporting of a very long heavy pipe string.

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Inventors: Person, Abraham (Los Alamitos, CA, US)
Bolding, Vance E. (Redondo Beach, CA, US)

Application Number: 479093
Filing Date: 1974-06-13
Publication_date: 1976-03-16
Assignee: Global Marine Inc. (Los Angeles, CA)
Primary Class(es): 114/264 92/10, 92/143, 175/5, 175/27, 267/126
Other Classes:
US Patent Ref:

3158206	Nov, 1964	Kammerer	175/5.
3208728	Sep, 1965	Parks	254/172.
3328019	Jun, 1967	Wilson	267/64.
3403728	Oct, 1968	Richardson et al.	166/.
3653635	Apr, 1972	Bate, Jr. et al.	175/5.
3681928	Aug, 1972	Vincken et al.	166/.
3687013	Aug, 1972	Haller	92/8.
3714995	Feb, 1973	Hanes et al.	175/5.
3718316	Feb, 1973	Larralde et al.	175/5.
3793835	Feb, 1974	Larralde	175/27.
3866696	Feb, 1975	Larralde et al.	175/5.

Other Refs:
Primary Examiner: Blix, Trygve M.
Assistant Examiner: Basinger, Sherman D.
Attorney: Christie, Parker & Hale