What is a full face flange gasket?
A full face gasket covers the entire face of the flange. This means it has the same outer diameter measurement as the flange, and will also have the necessary holes for the securing bolts pre-cut into the gasket. Positioning the gasket is made easier with the presence of the securing bolt holes.
Can full face gasket be used on raised face flange?
Full-Face Gasket Like the ring-type gasket, this can also seal raised flange faces, but will have an OD the same as the flange. That means it needs holes for the securing bolts to pass through, and these help locate the gasket on the flange, making alignment easier.
What type of gaskets are used on flanges with raised faces?
A gasket for a raised face flange is typically a RING gasket.
What are the different types of flange gaskets?
The three primary types of Flange Gaskets are Non-metallic, Semi metallic and Metal Gaskets. The Non-metallic Flange Gaskets are used in low pressure, low temperature and noncritical service applications.
What is face of flange?
The face of a flange is the side opposite the hub that faces the bolted connection of the main flange flange fitting or flange valve. The most common face is the Raised Face flange, such as the one I have here. On this Class 150 flange, we have a 1/16 inch raised face.
Why raised face flange is used?
Raised Face Flanges 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.
What gasket should you use on a flat face flange?
The full-face gasket is typically used with flat face flanges but can also be used with RF flanges. It sits on the raised flange faces but has the same outside diameter of the flange. For that reason, it has to have holes for the bolts securing the flanges to pass through.
How do I choose a gasket for my flange?
All of these factors must be taken into consideration when selecting a gasket:
- The Flange Load.
- Pressure in the Piping System.
- Temperature in the Piping System.
- Fluid Type.
- Gasket Outer Diameter.
- Gasket Thickness.
- Gasket Width.
- Gasket Surface Finish.
What is the difference between RTJ and RF?
Answer: RF means “Raised Face.” RTJ means “Ring Type 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).
Can you use a ring gasket on a flat face flange?
When it comes to sealing raised or flat face flanges, two types of gaskets can be used: ring and full-face gaskets. Each type is best suited for specific flange designs, so knowing the difference is important for choosing the type that will best service your application.