Method and an apparatus for maintenance of valves included in subsea production system for oil and gas
CA 1279003 C · Owner: Ab Asea-Atom · Inventors: Mong, Tore; Hoglund, Kjell; Husebye, Ragnar
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and an apparatus for replacing an insert unit included in an insert valve assembly belonging to a subsea production system for gas and oil. In carrying out the method, a manipulator is brought by means of a sheave a, hoisting cable and guide wires down to a predetermined location on the bottom of the sea. The manipulator comprises a telescopic arm which is then moved towards and fixed by means of a hook and a lug to a valve tree which supports a valve, the insert unit of which is to be unscrewed from the respective valve housing and be replaced. A carriage located in the manipulator and comprising retracting, aligning and fixing devices is brought with the aid of the telescopic arm …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted January 15, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 15, 2008.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.