Design and Manufacture: BS 1873 and ASME B16.34
Inspection and Test: API 598
End Flange Dimension: ASME B16.5
BW End Dimension: ASME B16.25
Socket-weld Dimension: ASME B16.11
Face to Face and End to End: ASME B16.10
Pressure Temperature Ratings: ASME B16.34