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1. (WO2018160071) HYDRAULIC SYSTEM

Pub. No.:    WO/2018/160071    International Application No.:    PCT/NO2018/050052
Publication Date: Sat Sep 08 01:59:59 CEST 2018 International Filing Date: Wed Feb 28 00:59:59 CET 2018
IPC: E21B 33/035
F04B 5/02
F04B 9/08
F04B 9/10
F04B 9/109
F04B 53/14
Inventors: OTTESTAD, Nils Terje
A subsea-based hydraulic system including a pump device (1) which is arranged to produce hydraulic power by extracting pressure energy from liquid that is being transferred from a reservoir (120) at approximately ambient pressure into a low-pressure tank (301) at an internal pressure which is lower than the ambient pressure, the pump device (1) being provided with a piston arrangement (24) which is reciprocated under the influence of a pressure difference between the reservoir (120) and the low-pressure tank (301 ), and the pump device (1) being arranged to produce a desired pressure in liquid that is supplied to the pump device (1) from the reservoir (120) or from another reservoir that has approximately the same pressure as a water mass surrounding the pump device (1).