= BS EN ISO 17292:2004 = it is better to use ISO 14313 2007 edition as most practical and coverage for Pipeline valves
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BS standards are british standards EN standards are European Union standards. For individual differences you would need to look at the particular standard you are concerned with. There are many thousands.
S355 in bs
Kindly inform which steel is the equivalent to a193 b7
bs 381 c 110
They are both equivalent in terms of the educational level of attainment.