What is FF in flanges?
Flat face (FF) flanges are similar to the RF flanges, but they do not have the raised area like the RF flange. Instead, the whole surface is flat. That means that the gasket used with the FF flange has full contact with the whole surface where two flanges are mated.
What is RJ flange?
A Ring type joint flange(RTJ) is a machined metallic ring with a deep groove cut into its face. Stainless Steel Ring type Joint Flanges are classically used in high-pressure and high-temperature services, while Carbon Steel Ring type Joint Flanges are spill-proof.
What is flange face finish?
The facing finish or face finish of a pipe flange manufactured in accordance with ASME B16. 5 refers to the smoothness or roughness of the facing surface. In a bolted flange joint, the flange face is in direct contact with the gasket.
What is RF and RTJ?
RTJ flanges have grooves in their sealing faces, while RF flanges do not. If you want to make a connection between the two flanges, you can only apply a flat gasket. This flat gasket wil be make full contact with de sealing surface of the RF flange, but not with the sealing surface of the RTJ flange.
What is mating flange?
It is a structural angle or channel that is welded to the end of the ducting facilitate bolting or welding the expansion joint into the system.
Can you use a raised face flange with a flat face flange?
Flat face flanges are never to be bolted to a raised face flange. ASME B31. 1 says that when connecting flat face cast iron flanges to carbon steel flanges, the raised face on the carbon steel flange must be removed, and that a full face gasket is required.
What is RTJ valve?
The Ring Type Joint flanges are typically used in high pressure (Class 600 and higher rating) and/or high temperature services above 800°F (427°C). They have grooves cut into their faces which steel ring gaskets. An RTJ flange may have a raised face with a ring groove machined into it. …
Are flat face flanges serrated?
The most common flange face surface designs are smooth and serrated. Flat face (FF) flange surfaces and raised face (RF) flange surfaces require serrations if built to industry standards.
What does the face of an RTJ flange look like?
An RTJ flange may have a raised face with a ring groove machined into it. This raised face does not serve as any part of the sealing means. RTJ flanges have grooves cut into their faces which accept steel Ring Gaskets.
What are the specifications of ring type joint flanges?
Specifications of Ring Type Joint Flange: An RTJ flange may have a raised face with a ring groove machined into it. This raised face does not serve as any part of the sealing means. For RTJ flanges that seal with BX ring gaskets, the raised faces of the connected and tightened flanges may contact each other.
What’s the best type of flange to use?
Ring type joint flange face surfaces are an increasingly popular option with regards to flange connections. RTJ Flanges are a good alternative to raised face in certain applications. Typically, higher pressure and temperature projects use Ring Type Joints.
What’s the difference between flat and raised Face flanges?
1 Raised Face height. 2 Flat Face (FF) The Flat Face flange has a gasket surface in the same plane as the bolting circle face. 3 Ring-Type Joint (RTJ) The Ring Type Joint flanges are typically used in high pressure (Class 600 and higher rating) and/or high temperature services above 800°F (427°C). 4 Ring Type Joint gaskets.
