2021BS EN 10253-2:2021 Butt-welding pipe fittings. Non alloy and ferritic alloy steels with specific inspection requirements
2007BS EN 10253-2:2007 Butt-welding pipe fittings - Non alloy and ferritic alloy steels with specific inspection requirements
1968BS 1640-3:1968 Specification for steel butt-welding pipe fittings for the petroleum industry - Wrought carbon and ferritic alloy steel fittings - Metric units
1963BS 1965-1:1963 Specification for butt-welding pipe fittings for pressure purposes. Carbon steel
1962BS 1640-1:1962 Specification for steel butt-welding pipe fittings for the petroleum industry - Wrought carbon and ferritic alloy steel fittings