Wye pieces

Sandvik supplies wye pieces produced by hot isostatic pressing (PM HIP). By using wye pieces produced by PM HIP, weight can be reduced significantly compared to wye pieces produced by casting or forging.

A 40% weight reduction was achieved on the wye piece using hot isostatic pressing (HIP).

A large subsea wye piece in UNS S31803 duplex stainless steel was a challenging order, requiring a great deal of design work, stress analysis and 3D finite element analysis.

If made conventionally by casting or forging, the piece would have been oversized and likely weighed some 3.5 tonnes to withstand the 250 bar design pressure. But powder metallurgically based hot isostatic pressing (PM HIP) allows for a significant degree of optimization, and the finished piece weighed only 2 tonnes.

Excellent resistance to HISC

By using pure duplex, super-duplex or nickel alloy powder and powder metallurgically based hot isostatic pressing (PM HIP), Sandvik HIP products have excellent resistance to corrosion and hydrogen-induced stress cracking (HISC). Sandvik HIP products' resistance to HISC is documented in DNV RP-F112.

Example of wye piece produced by Sandvik hot isostatic pressing (HIP)
Wye piece
Customer/field Rockwater, UK/East Spar
Material UNS 31803, duplex stainless steel
Dimensions Length 2000 mm, OD 450 mm, ID 350 mm
Length 78.7 in., OD 17.7 in., ID 18.8 in.
Weight 2 tonnes/piece

HIP advantages

Using HIP products instead of, for example, castings and forgings mean several advantages, such as less machining and welding.