Mokveld has been awarded the subsea anti-surge control valves for the Åsgard Subsea Gas Compression Project.
Subsea gas compression is a technology approach that can boost recovery rates and lifetimes of offshore gas fields. Aker Solutions was awarded the contract by operator Statoil to supply a complete subsea compression system for Norway’s Åsgard field. The project is an important step in realising Statoil’s vision of a complete underwater plant.
One of the technology gaps to be addressed was the development of large fast-acting subsea control valves. Several operators approached Mokveld to investigate the axial flow concept as the basis for a subsea control valve.
The technological demands on subsea equipment are very stringent and so are the qualification tests. In close cooperation with well-known subsea integrators Oceaneering, FMC and Aker Solutions, Mokveld has developed and successfully qualified an 8 in. / API 5.000 subsea axial control valve. The qualification program included an API 6A PR2 test, endurance testing with 500 000 cycles and hyperbaric testing simulating seabed conditions. A valve was also supplied to the Ormen Lange Subsea Compression Pilot - extended life test - project at Shell Nyhamna.
Mokveld has now announced a first project order for three off 8 in. / API 5000 subsea control valves with electrical spring to open Oceaneering actuators. The valves will be used in a quick-opening anti-surge control application. These valves will be operating at a water depth of 250 m. Mokveld considers this as an important step into the subsea market.
The qualified axial valve design is suitable for subsea anti-surge and separator control applications. In addition, the valve design can be used for subsea HIPPS applications as per API RP17O.
Adapted from press release by Callum O’Reilly