Flanges Classification Based on Facing


What is a Flange?

“A flange is a device used to connect pipes, valves, pumps and other equipment to form a piping system. Usually, Flanges are welded or screwed. Flanges Provide easy access for cleaning, inspection and Modification. Flanges joints are made by bolting together two flanges with a gasket between them to provide a seal”.

What is a Flange Face?

A Flange face is basically the surface area which hosts the gaskets. To Avoid damage or to prevent leakage of the joint different Flange with different Face & different Gaskets
are used. Flat Face, Raised Face, Male & Female, Ring Type joint, Tongue & Groove are some of the available flange face.


Male & Female (M&F)


Flanges must match in order to use this type of Flange. The Male Flange face is smoothly finished and is ¼ inch high. This Male Flange has an area that extends beyond the normal Flange whereas the female flange is also smoothly finished but is machined into its face. The Female Flange Face is 3/16 inch-Deep and the outer diameter of the female face acts to locate and retain the gasket. 



Raised Face (RF)


The most common type of Flange used in the industries is the Raised Face Flange. This Flange can be identified Easily, because the gasket surface is raised above the Bolting Circle face. The purpose of a RF flange is to release more pressure on a smaller gasket area and thereby increasing the pressure containment capability of the joint. Pressure rating of the flange determines the height of the raised face.

Flat Face (FF)



Another yet common type of Flange is the Flat Face Flange. This Flange has a gasket Surface in the same manner as of the bolting Circle face. Flat face flanges are never to be bolted to a raised face flange, 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.

 

Ring-Type Joint (RTJ)



The Ring Type Flange has a raised Face with a ring groove machined into it and is typically used in high pressure or high temperatures. To Create a metal to metal seal, this flange is tightened with bolts. The Bolts compress the gasket between the Flanges into grooves as this groove is used for making a contact to the gaskets. In other words the raised faces of the connected and tightened flanges may contact each other.

 

Tongue-and-Groove (T&G)



The Tongue and Groove faces of this flanges must be matched. One flange face has a raised ring (Tongue) machined onto the flange face while the mating flange has a matching depression (Groove) machined into its face. Tongue-and-groove facings are standardized in both large and small types. They differ from male-and-female in that the inside diameters of the tongue-and-groove do not extend into the flange base, thus retaining the gasket on its inner and outer diameter.
Tongue-and-groove joints also have an advantage in that they are self-aligning and act as a reservoir for the adhesive.

More Resources:

·         An Overview of Slip on Flange

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