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A flange is a forged or cast ring of steel designed to connect sections of pipe or join pipe to a pressure Vessel, pump or any other integral flanges assembly.

Flanges are joined to each other by bolting and joined to the piping system by welding or threading.

The basic types of flanges are; Slip on, Blind, Weld Neck, Threaded, Socket Weld, Lap Joint and Orifice.

Flanges are designed to the following pressure ratings; 150lb, 300lb, 400lb, 600lb, 900lb, 1500lb and 2500lb.

The most common facings machined on flanges are: (a) Raised face, 1/16 inch for 150lb and 300lb, ¼ inch for 400lb and heavier. (b) Flat face, for 150lb and 300lb only, other may be flat face on request. (c) Ring type joint, may be applied to all pressure ratings.

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