BS 1640-2:1962(1999) Specification for Steel butt - welding pipe fittings — For the petroleum industry — Part 2 : Wrought and cast austenitic chromium - nickel steel fittings
2008BS EN 10253-3:2008 Butt-welding pipe fittings - Part 3: Wrought austenitic and austenitic-ferritic (duplex) stainless steels without specific inspection requirements
1962BS 1640-2:1962 Specification for steel butt-welding pipe fittings for the petroleum industry - Wrought and cast austenitic chromium-nickel steel fittings