Standards Reference
Built to Code
Four major standards cover the majority of weld neck flange specification. Each governs different pressure regimes, dimensional families, and material chemistry.
ASME B16.5 / B16.47
Pipe flanges 1/2 to 24 inch in B16.5 and 26 to 60 inch in B16.47 Series A and B. Class 75 through 2500.
API 6A / 6BX
Wellhead and pressure-control. 2000 PSI through 25000 PSI. R and BX ring gaskets. Material classes AA through HH.
AWWA C207
Steel pipe flanges for waterworks. Class B, D, E, F from 86 to 300 psi working pressure. 4 to 144 inch.
DIN EN 1092-1
European metric weld neck flanges. PN 6 through PN 400. DN 10 through DN 4000. Types 11 and 12.
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