Design: API6D
Face to face: ASME B16.10
Flange connection dimension: ASME B16.5/ASME B16.47/MSS SP-44/ASME B16.47B/API605
BW end dimension: ASME B16.25
Pressure & temperature: ASME B16.34
Wall thickness dimension: API600/BS1868
Inspection & test: API598/API6D