Control system

US8322427B2 · kind B2 · utility

Assignee

• FMC Kongsberg Subsea AS · NO

Inventors

• Olav Inderberg · Kongsberg, NO
• John A. Johansen · Kongsberg, NO

Key dates

• Filing date: Dec 12, 2007
• Grant date: Dec 4, 2012
• Expiry date: Feb 6, 2029

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21B47/117
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

A method of reducing a pressure within a first cavity of a subsea device is disclosed which includes transferring fluid within the first cavity to an accumulator, increasing a pressure of the fluid within the accumulator and, after increasing the pressure of the fluid within the accumulator, transferring at least some of the fluid in the accumulator into a second cavity, wherein the second cavity is at a higher pressure than said first cavity. A device for reducing a pressure within a first cavity of a subsea device is also disclosed which includes a transfer accumulator comprising a piston, the transfer accumulator being in fluid communication with the first cavity and a second cavity, at least one first valve positioned between the first cavity and the transfer accumulator, the at least one first valve adapted to permit fluid flow only from the first cavity to the second cavity, and at least one second valve positioned between the transfer accumulator and the second cavity, the at least one second valve adapted to permit fluid flow only from the transfer accumulator to the second cavity.