Raised Face (RF) Flange

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This blog talks about raised face flange, giving the most efficient details.

The Raised Face flange is the most common type used in process plant applications, and is easy to identify. It is referred to as a raised face because the gasket surfaces are raised above the bolting circle face. This face type allows the use of a wide combination of gasket designs, including flat ring sheet types and metallic composites such as spiral wound and double jacketed types. The purpose of a RF flange is to concentrate more pressure on a smaller gasket area and thereby increase the pressure containment capability of the joint.

RF flanges seal with a flat gasket, formerly made of asbestos but now made of more environmentally friendly material, designed for installation between the raised faces of two mating flanges (both with raised faces). The raised faces have a prescribed texture to increase their gripping and retaining force on this flat gasket. Some users of raised face flanges specify the use of spiral wound gaskets.

Where should it be used ?
Raised Face Flange should be used in the pipelines where there are minimal or no leakage conditions expected. Raised Face Flange due to its very shape, ensures a tight coupling with the gaskets. Hence, gasket is held with the pressure between the two raised faces of the mating flanges.