What is the classification of flanges?
The key types of flanges are the welding neck, long welding neck, slip-on, socket weld, lap joint, threaded and blind flanges.
What is a flange gasket?
A flange gasket is a gasket made to fit between two sections of pipe that are flared to provide higher surface area.
What is the purpose of a raised face flange?
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 a ring flange?
A Ring type joint flange(RTJ) is a machined metallic ring with a deep groove cut into its face. This groove rests a metal ring which gets compressed when the connecting bolts of the flange are tightened. This compression results in a leak-proof, close-fitting seal on the pipe or connection.
What is the difference between a gasket and a flange?
Gaskets seal a connection between two components or flanges that have flat surfaces, while seals are used between engine parts, pumps, and shafts that rotate. Gaskets are used wherever a union or flange is required to prevent leaking.
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 the difference between flat face and raised face flange?
The difference between a raised face and a flat face flange is that the raised face has a raised area that surrounds the pipe bore and the flat face flange doesn’t. These are two of the most commonly used types of flange faces.
What are three 3 basic flange face types?
Flange Faces
- There are three common types of flange face, the plain/flat, raised, and ring-type joint (RTJ).
- Flange Face Types.
- As a general rule, the smaller the contact surface area between the flange faces, the harder the gasket and flange sealing surface material will be.
What is RTJ in valve?
A ring joint flanges (RTJ) is used when a metal-to-metal seal between the mating flanges is required (which is a condition for high-pressure and high-temperature applications, i.e. above 700/800 C°). A ring joint flange features a circular groove to accommodate a ring joint gasket (oval, or rectangular).
Do flanges need gaskets?
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.
What are the three basic flange types of gaskets?
What is RF and FF for flange?
FLANGE FACE TYPES. RAISED FACE FLANGE (RF) FLAT FACE FLANGE (FF) RING JOINT FLANGE (RTJ) LAP JOINT FLANGE.