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Alloy Steel A182 F5 WN flange PSI10000

The difference between ASME/ANSI and API

High Pressure 2IN 1500PSI Socket Weld Flange

ASTM A182F 316L Forged Steel Thread Flange

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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)
Flange	ASME/ANSI B16.5	API 6A	ASME/ANSI B16.5	API 6A¹⁾
Weld neck	600	2000	1/2 – 24	1^13/16 – 11
	900	3000
	1500	5000
Blind and Threaded	600	2000		1^13/16 – 21^1/4
	900	3000		1^13/16 – 20^3/4
	1500	5000		1^13/16 – 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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