British Standards define steel pipe by specification (the BS 36xx series), dimensional series and material grade. BS 3601 covers carbon-steel pipe for pressure purposes at room temperature; BS 3602 the same for elevated temperatures; BS 3603 low-temperature service; BS 3604 alloy steels for high temperature and BS 3605 austenitic stainless. Threaded and socketed tube follows BS EN 10255 (formerly BS 1387) in Light, Medium and Heavy series, while seamless and welded pressure tube follows BS EN 10216 / 10217.
Several legacy BS pipe standards have been withdrawn in favour of harmonised BS EN equivalents. Always confirm the current standard, the certified material and the governing design code against the project specification before procurement.
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