BP’s £3bn Quad 204 offshore project uses Orseal valves

Quad 204 is the £3bn redevelopment of the Schiehallion and Loyal fields, located 175 km west of Shetland in Blocks 204 and 205 of the UK Continental Shelf, at water depths of 300m to 550m. The project is one of the most significant engineering challenges BP and its partners have ever undertaken, to include a new state-of-the-art floating production storage and offloading (FPSO) vessel, the renewal of much of the subsea infrastructure network, and an extensive drilling programme.


3/4″ full bore double block & bleed (DBB) valve, flanged CL150RF, titanium B348 Gr2, extended lever operated & locking

Winning the BP contract from a UK process company, Orseal needed to supply valves suitable for this harsh offshore climate, where full documentation and traceability were of paramount importance, with all European-sourced raw materials used in the valves having full Qualification Test Records (QTR) from the foundry. The project is completed to NORSOK Standards M630 and M650, the Standards developed by the Norwegian petroleum industry that build on over forty years’ experience from the Norwegian Continental Shelf.

For the Quad 204 project, Orseal supplied a range of valves from ½” to 3”, both manual and actuated, and manufactured in super duplex stainless steel for use in vacuum pump skids. Orseal provided super duplex stainless steel due to its specific benefits as compared to either austenitic or ferritic steels, which make it most suitable for the offshore environment of the North Sea. The greater strength of super duplex offers a weight reduction that can lead to significant transportation and assembly cost savings, with an associated reduction in environmental impact. Super duplex stainless steel’s corrosive resistance and its ability to withstand the damaging effects of crevice corrosion offer a longer lifespan than standard steels – ideal in an offshore environment.

Installation of the Quad 204 subsea pipelines began in 2015 and this year will see the installation of all the new pipelines and the new FPSO, the Glen Lyon, complete with Orseal-supplied special products.

For more information on this project, and to find out more about Orseal’s range and consultancy services, please contact us.

Orseal Ltd

Lynstock Way, Lostock, Bolton, Lancashire, BL6 4QR, UK.