Three Most Common Types of Flange Faces | FLAT ...

by Whitney Moore

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Three Most Common Types of Flange Faces

1. Flat Face Flange

Starting with a flat face flange, these flange get their name because they have a flat face without any protrusions or raised surfaces. These flanges use a 'full face' gasket and have a large contact sealing area. They are normally cast iron and are used during low pressure applications and for pressure classes 125 and 200. Flat face flanges are easy to align during installation and are typically a more affordable option compaired to the other two flange types. The easiest way to protect these from damage and corrosion are by applying an adhesive or magnetic flange protector. 

2. Raised Face Flange

Raised face flange are the most common types of flanges and are used in a wide variety of industries. These flanges this get their name because the flange face is raised off the bolting circle plane. The raised face acts as a sealing surface when the flanges are bolted to another flange or piece of equipment. These flanges are available in 150# - # pressure classes and are normally used in process plant applications.

Raised face flanges focus pressure on a small area of the gasket to improve sealing/pressure control. This design helps prevent leaks and ensures that the system operates properly, so it is crucial to do regular inspection of the raised face. Tools such as the P3-GIT are designed to help you identify whether or not your raised face flanges passes inspection. The cut-out window mimics where the gasket sealing surface will come in contact with the flange face.

There are also several types of raised face flanges, each designed for specific applications and operating conditions. The three more common types of raised face flanges are weld neck, slip-on, and blind flanges. 

3. Ring-Type Joint (RTJ)

Ring-type joint or RTJ flanges are typically used for more sever applications, particularly for high pressure or high temperature applications. They are designed to provide a leak-proof seal in critical environments where traditional gaskets may fail. The sealing surface on these types of flanges are in a machined groove. This metal-to-metal groove creates a seal that is highly resistant to extreme pressures and temperatures.

All three of these flange types are used in a wide variety of industries such as oil and gas, petrochemical, power generation, etc. and need to be properly maintained and protected in order to preform correctly. 

What is the flange?

A flange is a protruded ridge, lip or rim, either external or internal, that serves to increase strength (as the flange of an iron beam such as an I-beam or a T-beam); for easy attachment/transfer of contact force with another object (as the flange on the end of a pipe, steam cylinder, etc., or on the lens mount of a camera); or for stabilizing and guiding the movements of a machine or its parts (as the inside flange of a rail car or tram wheel, which keep the wheels from running off the rails). Flanges are often attached using bolts in the pattern of a bolt circle. The term 'flange' is also used for a kind of tool used to form flanges.

3 Most Common Flange Types

Vacuum flanges are mostly used for vacuum tube furnaces, and three most common flanges are:

• CF flange
• KF flange
• ISO flange

What are the differences and connections between them? Here we will list the structure of the three flanges and the applicable standards one by one, hope to help you.

1'CF flange

Conflat Flange, is a kind of flange connection used in ultra-high vacuum, is a metal static seal, and can withstand high-temperature heating.

• Nominal diameter sizes include DN16, 40, 63, 100, 160, 200, 250.
• Suitable for vacuum levels up to 10-12 mbar.
• Flange sealing materials are usually Viton, PTFE, oxygen-free copper, etc.
• Flanges are usually 304, 316 stainless steel, etc.

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2'ISO-KF flange

ISO-KF is a kind of quick-release flange used in a vacuum system. It consists of the following components: two symmetrically distributed KF flanges, O-Ring, a centering bracket, and a clamp. The coupling can be loosened or tightened by simply twisting the disc nut by hand without the use of additional tools.

• ISO-KF vacuum couplings are small-size quick-release flange couplings.
• Nominal diameter sizes include DN 10, 16, 25, 40, 50.
• Manufacturing standards include DIN , ISO .
• Suitable for vacuum levels up to 10-8 mbar.
• Flange sealing materials are usually Viton, Buna, Silicone, EPDM, aluminum, etc.
• Flanges are usually 304, 316 stainless steel, etc.
• ISO-KF vacuum couplings are usually composed of flanges, clamps, O-Rings, and centering rings.

3'ISO flanges

ISO flanges and piping can be used in a variety of applications from atmospheric pressure to high vacuum, often assembled and disassembled. Generally, the diameter of the tube is more than 50mm (2 inches). If the use of fluorine rubber O-ring can withstand 150 ' baking.

• The two common forms of ISO flanges are ISO-K and ISO-F.
• ISO-K and ISO-F vacuum couplings are large-size vacuum couplings with nominal diameter sizes including DN 63, 100, 160, 200, 250, 320, 400, 500, and 630.
• Manufacturing standards include DIN , and ISO .
• They can be used in applications requiring vacuum levels up to 10-8 mbar.
• Flange sealing materials are usually Viton, Buna, Silicone, EPDM, aluminum wire, etc.
• Flanges are usually 304, 316 stainless steel, etc.

1'ISO-K vacuum couplings usually consist of flanges, flange jaws, O-Ring, and a centering ring.

2'ISO-F vacuum couplings usually consist of flanges, O-Ring, and a centering ring, but the flanges are bolted.

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