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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 Untied Bellows
Tied Lateral Single Bellows
Single Untied Bellows:
This type of Bellows as 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
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