Flange Gaskets

Flange gaskets are used for improved joint performance.

They are considered much more superior than the conventional ring or full-face gaskets. Although pipe flange gaskets are usually used for all normal water and sewer service, they are especially useful in demanding services like in very large diameter flanged piping.

For specially designed long-span installations, involving 2 or 3 or more lengths of pipe or with any underground flanges, flange gaskets are of great help because they could be subjected to undesirable beam loading.

These gaskets are available in numerous standard materials in various thickness and hardness options for various flange sizes. Flange gaskets are also available with adhesive on one or both sides or without adhesive. Most materials are available starting at 1/32” thick and can be supplied up to 1” thick. Some manufacturers supply flange gaskets in wide rolls from which you can cut your flange gaskets to size. Flange gaskets are also available to your exact requirements. Pipe flange gaskets are being very frequently used for flanged joints which are subjected to extreme chemical attacks.

Materials used:

A flange gasket is a type of gasket made to fit between two sections of pipe that are flared to provide higher surface area. Flange gaskets come in a variety of sizes and are categorized by their inside diameter and their outside diameter.

Flange gaskets are made of various materials like:

• Rubber:Neoprene, EPDM, Nitrile, EVA, Silicone, Cork and Cork Rubber
• Closed Cell Foam:Cross-linked Polyethylene, PVC
• Plant Fiber
• Cellulose Fiber

What Are the Different Types of Gaskets?

The most common types of gaskets are:

• Gaskets used in piping (flange gaskets)
• Gaskets used in vehicles (cars, boats, planes, trains)
• Gaskets with certain material properties (cork, rubber paper etc.)
• Gaskets used for a particular function (for pressure, temperature, or chemical resistance)
• Bespoke or custom made gaskets

What is the difference between a RTJ, FF, and RF flange on seals and thermowells?

管垫圈(也被称为法兰垫片)re made from wide range of materials such as rubber, non-asbestos and graphite. The gaskets can be bought as either Full Faced (with bolt holes) or Inner Bolt Circle (IBC, ring type or raised face).

There are many standards in gasket for flanges of pipes.

Type RF

Type FF

Type RTJ

The raised face, RF, is the standard process connection on our third party seals and thermowells. Both have options for a RTJ and FF type flange connections. The Raised Face (RF) is the most common type used in process plant applications.

The gasket surface of the flange is raised above the bolting circle face. A Ring-type Joint (RTJ) can also have a raised gasket face with the difference being the ring groove machined in this face. This groove will accommodate a steel ring gasket for flange mating. The Flat Face, FF, flange has a gasket surface that is in the same plane as the bolting circle face. None of these three flange types are interchangeable between types, i.e. RTJ flange cannot be mated to a RF flange.