Heave compensating system

US9267340B2 · kind B2 · utility

Assignee

• National Oilwell Varco Norway AS · NO

Inventors

• David Bengt Johan Ankargren · Kristiansand, NO
• Jochen Pohl · Partille, SE

Key dates

• Filing date: Oct 11, 2011
• Grant date: Feb 23, 2016
• Expiry date: May 24, 2032

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B66D1/525
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A heave compensating system for a marine vessel includes a hydraulic machine configured to be coupled to a load suspended from the vessel and to vary the distance between the load and the vessel in response to heaving motion of the vessel. The system further includes a second hydraulic machine in fluid communication with a hydraulic accumulator, both the first and second hydraulic machines are mechanically connected to one another and a shared electric motor, and a controller configured to control hydraulic movement of the first and second hydraulic machines and to control the supply of power to the electric motor.