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Flanges - API vs. ASME/ANSI
Comparing API and ASME/ANSI flanges
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The difference between ASME/ANSI and API flanges is the fabrication material and the higher rated API operating pressure.
ASME/ANSI flanges are common 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 are similar dimensionally - but the API 6A flanges are rated for higher pressures as shown in the table below:
| API vs. ASME/ANSI Flanges | ||||
| 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 11/2 to 10(20) inches.
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Related Topics
- Codes and Standards - Piping codes and standards - ASME, ANSI, ASTM, AGA, API, AWWA, BS, ISO, DIN and more..
- Dimensions - Sizes and dimensions of pipes and tubes, and their fittings - inside and outside diameter, weight and more
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Related Documents
- API - American Petroleum Institute - The American Petroleum Institute - API
- Carbon and Stainless Steel Flanges - ASME/ANSI Class 1500 - ASME/ANSI B16.5-1996 Pipe Flanges and Flanged Fittings - Class 1500 Flanges - outside and inside diameters, bolt circles, numbers and diameters of bolts
- Gasket Characteristics - Gaskets are used to make a fluid or gas resistant seal between two surfaces
