Stainless Steel Closet Flange
Stainless Steel Closet Flange
Stainless Steel Closet Flange
Stainless Steel Closet Flange

Stainless Steel Closet Flange

In most cases, standards are interchangeable, as most local standards have been aligned to ISO standards; however, some local standards still differ. For example, an ASME flange will not mate against an ISO flange.[citation needed] Further, many of the flanges in each standard are divided into "pressure classes", allowing flanges to be capable of taking different pressure ratings. Again these are not generally interchangeable (e.g. an ASME 150 will not mate with an ASME 300).[3] These pressure classes also have differing pressure and temperature ratings for different materials. Unique pressure classes for piping can also be developed for a process plant or power generating station; these may be specific to the corporation, engineering procurement and construction (EPC) contractor, or the process plant owner. The ASME pressure classes for flat-face flanges are Class 125 and Class 250. The classes for ring-joint, tongue and groove, and raised-face flanges are Class 150, Class 300, Class 400 (unusual), Class 600, Class 900, Class 1500, and Class 2500.[3] The flange faces are also made to standardized dimensions and are typically "flat face", "raised face", "tongue and groove", or "ring joint" styles, although other obscure styles are possible. Flange designs are available as "weld neck", "slip-on", "lap joint", "socket weld", "threaded", and also "blind".

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stainless steel closet flange

ASME standards (U.S.)

Pipe flanges that are made to standards are called out by ASME B16.5 or ASME B16.47, and MSS SP-44. They are typically made from forged materials and have machined surfaces. ASME B16.5 refers to nominal pipe sizes (NPS) from 1⁄2" to 24". B16.47 covers NPSs from 26" to 60". Each specification further delineates flanges into pressure classes: 150, 300, 400, 600, 900, 1500 and 2500 for B16.5, and B16.47 delineates its flanges into pressure classes 75, 150, 300, 400, 600, 900. However, these classes do not correspond to maximum pressures in psi. Instead, the maximum pressure depends on the material of the flange and the temperature. For example, the maximum pressure for a Class 150 flange is 285 psi, and for a Class 300 flange, it is 740 psi (both are for ASTM a105 carbon steel and temperatures below 100°F).

European dimensions

Most countries in Europe mainly install flanges according to standard DIN EN 1092-1 (forged stainless or steel flanges). Similar to the ASME flange standard, the EN 1092-1 standard has the basic flange forms, such as weld neck flange, blind flange, lapped flange, threaded flange (thread ISO7-1 instead of NPT), weld-on collar, pressed collars, and adapter flange such as flange coupling GD press fittings. The different forms of flanges within the EN 1092-1 (European Norm/Euronorm) are indicated within the flange name through the type.

Design	According to EN type	According to DIN
Weld-neck flange	Type 11	DIN 2627 - DIN 2638
Blind flange	Type 05	DIN 2527
Threaded flange	Type 12	DIN 2558, DIN 2565 - DIN 2569
Flat flange	Type 01	DIN 2573, DIN 2576
Lapped flange	Type 02 and Type 04	DIN 2641, DIN 2642, DIN 2655, DIN 2656

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Rotating Flange

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