Standards:

Design and Manufacture: API 6D, BS5351, ASME B16.34
API 608, MSS-SP-72
Face To Face Dimension: ASME B16.10
End flange dimension: ASME B16.5(for NPS)

ASME B16.47
series B, ASME B16.47 series A, MSS SP-44(for NPS)

BW Connection Dimension: ASME B16.25
Test And Inspection: API 598
Fire-safe Design: API 607
Anti-static Design & Anti Blow-out Stem