Types of Expansion Joints (Bellows) in India

What is the axial pressure thrust of bellows?

Bellows convolution is flexible and can expand /contract axially. When an unstrained expansion joint is placed into the piping system, it is like a cutting pipe because the flexibility of bellow makes it unable to transmit the force in the pipeline. Axial pressure thrust force is generated due to internal pressure which is equal to Internal Pressure * Bellows cross-sectional area

What are the types of expansion joints (Bellows)?

Single Untied Bellows

Universal United Bellows

Tied Lateral Single Bellows

Single Untied Bellows:

This type of Bellows is one set of convolution

Very low-pressure piping systems

The axial pressure thrust will be less and can be transmitted to the piping system

Universal Untied Bellows:

This type of Bellows has two sets of convolution length will be more.

Low-pressure piping system

Takes more axial compression for expansion joint

Limited to low pressure in the piping system

Tied Lateral Single Bellows:

This type of bellows as a single set of convolution with tie rods and flanges

This can be used in high pressure, where there will be no axial thrust, axial pressure thrust will be taken care of by the tie rods and will take less amount of lateral movement