Standards:
Design and ,Manufacture: BS1868 or API6D
Inspection and Test: API598 or API6D
End flange dimension: ASME B16.5, ASME B16.47A, MSS SP-44; ASME16.47B, API605
BW end dimensions: ASME b 16.25
Face to face and end to end: ASME B 16.10
Pressure-temperature ratings: ASME B 16.34
Wall thickness dimensions: API 600 and BS 1868