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Piping Designers . com - Standards 26: Flanges - API vs. ASME/ANSI

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Strict Standards: Only variables should be assigned by reference in /home/pipingde/public_html/plugins/content/prizmimage/prizmimage.php on line 45

Strict Standards: Only variables should be assigned by reference in /home/pipingde/public_html/templates/rt_anacron/html/com_content/article/default.php on line 18

Comparing API and ASME/ANSI flanges

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:

 

1) In the old API standard, flanges ranged from 11/2 to 10(20) inches.

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