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BS EN 10220:2002
Seamless and welded steel tubes. Dimensions and masses per unit length (British Standard)
This document specifies for seamless and welded circular steel tubes for general puposes preferred dimensions for outside diameter and wall thickness in millimetres masses per unit length in kilogrammes per metre of plain end tube. The outside diameters are classified into three series reflecting the availability of accessories for piping systems. The range of usually producible steel tubes is given.
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British Standards Institution [bsi]