ASME B16.5 Flange Marking Explanation

ASME B16.5 Flange Marking; 

Marking (Stamp) on the flange according to the requirements of the AMSE B16.5 Pipe Flanges and Flanged Fittings Standard must include the size of the Flange, Flange Rating Class, the symbol “B16” or “B16.5”, Material Specification, and Manufacturer’s name.

Flange marking stamps.png

1: Size of Flange (NPS), Ex. 4″; See: PIPING/TUBING CONFIGURATIONS

2: Class of Flange, Ex. 150, 300, 600; See: FITTING PRESSURE RATING CLASS

4: Standard, Ex. B16 or B16.5

5: Material specification, Ex. SA A182 F304/304L; See: ASME B16.5 FLANGE MATERIAL GROUP


6. Heat No, Ex: CR47

7. Trade Mark, Ex: CE, KOR, VN ect.,

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