What is a raised face Slip on flange?

Stainless Steel Slip On Raised Face Flanges is referred to as a raised face because the gasket surfaces are raised above the bolting circle face. Carbon Steel Slip On Raised Face Flanges are manufactured with an inside diameter that is slightly bigger than the pipe’s outside diameter.

What is the height of a raised face on a flange?

1/16 inch
RAISED FACE FLANGE (RF) The height of the raised face depends on the flange pressure rating as defined by the ASME B16. 5 specification (for pressure classes 150 and 300, the height is 1.6 mm or 1/16 inch, for classes from 400 to 2500, the raised face height is approximately 6.4 mm, or 1/4 inch).

Why raised face flange is used?

The raised face (RF) is the most common type of flange facing used. It is called a raised face flange because it has a raised surface above the bolting circle where the gasket is placed. These flanges are widely used in oil and gas pipelines. They are appropriate for both high and low temperatures and pressures.

Is a lap joint flange raised face?

The lap joint flange can be used in sizes and pressure classes similar to that of a weld-neck flange. The nature of this joint means that the stub end facing is also the flange facing, which makes it raised faced, and the gasket seating surface.

How do raised face flanges work?

Raised Face and Flat Face The raised face is intended to decrease the surface area of the seal, thus concentrating the surface pressure applied when mating the flange. The result is a stronger seal. The raised face has a machined serrated finish that will bite into the gasket whenever pressure is applied.

What is raised flange?

Raised Face Flange It’s called a raised face because it has a raised surface above the bolting circle where the gasket is placed. Sealing this type of flange face is accomplished by compressing a soft, flat, or semi-metallic gasket between mating flanges in the raised area of the flanges.