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Ansi Standard

Ansi Standard

Ansi Standard

Could anyone tell me what is the meaning of ANSI 150lb or ANSI 300lb for a flange and how it's related to its working pressure?
Thanks a lot

RE: Ansi Standard

Pressure-temperature rating could be found in ANSI B16.5.

RE: Ansi Standard


ANSI B16.5 is a dimensional standard that provides:

 - Standard dimensions for various types and ratings of pipe flanges ( This data is required in order for manufacturers to produce interchangable items)

-  Combinations of allowable pressures at various temperatures for various materials (This data allows piping system designers to specify a flange that is strong enough to sustain a pressure at a certain temperature)

The pressure "classes" should not be confused with the pressure/temperature tables...... for example a 300 lb. class flange, made from carbon steel (ASTM A105 material)to the dimensions contained in B16.5 is acceptable for service at 740 psig at 70 F but can be used only to 410 psig at 800 F

Hope that this helps....


RE: Ansi Standard

Where do I find the standard on Revisions in drawings?

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