Definition and Uses

To start with there are three main types of Piping Expansion Joints Metal, Rubber, and Fabric. See below. An expansion joint is installed in piping systems for a couple of reasons. Firstly pipe expansion joints can absorb vibrations and shock. Secondly expansion joints can also be used to relieve anchor stress, reduce noise, and compensate for misalignment. Additionally certain expansion joints are also designed for thermal expansion in very hot applications. Next they are necessary in systems that convey high temperature substances such as steam or exhaust gases, or to absorb movement and vibration. A typical joint is made of metal, plastic, fabric, or an elastomer (rubber).

Expansion joints are also designed for other criteria, such as noise absorption, anti vibration, earthquake movement, and building settlement. Pipe expansion joints are also known as “compensators”, as they compensate for the thermal movement. Additionally Contact Us for more information.


To begin with, expansion joints consist of different components, bellows, liners, cover, end fittings, and limit rods. Formerly people often confuse an expansion joint with a bellow.  And they think the names can be used the as one in the same, this is not true. Furthermore expansion joint consist off all the components. A bellow is just one of the components of the expansion joint. The bellow is the body of the expansion joint. Bellows can have Convolutions. Bellows can be made out of different materials. They are smallest flexible unit on the expansion joint.

In addition to bellows is liners, liners are used to protect the inside of expansion joint from erosion. When high flow of air, fluids, steam flows across the inside of a bellow, it can cause it to not work. In fact liners can prevent this problem. Also liners can reduce turbulence. Further outside covers should be used to protect the bellow from being damaged. In addition to, they can insulate the bellow. Also Expansion joints can use flanges or butt-weld ends. Next it limit rods, they may be used in an expansion joint design to limit the axial compression or expansion. Furthermore they allow the expansion joint to move over a range according to where the nut stops are placed along the rods. Limit rods are used to prevent bellows over-extension while restraining the full pressure thrust of the system.