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Alloy Steel A182 F5 WN flange PSI10000

The difference between ASME/ANSI and API

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The difference between ASME/ANSI and API

The difference between ASME/ANSI and API is the fabrication material and a higher rated API operating pressure.

ASME/ANSI flanges are commonly used in industrial process systems handling water, steam, air and gas. API flanges are manufactured for high strength operating refinery systems with products such as oil and explosive gases.

The flange standards API 6A and ASME/ANSI B16.5 have the same dimensions – but the API 6A flanges are rated for higher pressures as indicated below:

API vs. ASME/ANSI Flanges with the same Dimensions
Flange Pressure Class Rating
(psi)
Nominal Size Range
(inches)
ASME/ANSI B16.5 API 6A ASME/ANSI B16.5 API 6A1)
Weld neck 600 2000 1/2 – 24 113/16 – 11
900 3000
1500 5000
Blind and Threaded 600 2000 113/16 – 211/4
900 3000 113/16 – 203/4
1500 5000 113/16 – 11

1) In the old API standard, flanges ranged from 1 1/2 to 10(20) inches.

  • 1 inch = 25.4 mm
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