ASME and API flanges may sometimes be compatible for bolting

tian98

Although the dimensions of ASME and API flanges may sometimes be compatible for bolting - using the same bolt circle and the same number of bolts - they do not share the same pressure rating system.

ASME rates the pressure of a class based on the material of construction and the design temperature

API specifies allowable materials and gives it a specific pressure rating

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.

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