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How do you remove an expansion joint from a pipeline?

In order to remove an expansion joint from a pipeline you must first shut off the fluid or gas flowing through the piping system. Then you must install braces across the bellows so that the expansion joint does not move. The expansion joint can then be removed by unbolting the flanges or cutting the expansion joint out of the pipeline.

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How do you order an expansion joint?

As a minimum the following information should be provided when ordering an expansion joint:

  • Size of the line.

  • Design pressure.

  • Design temperature.

  • Design movements and required cycle life.

  • Overall length requirement, if any.

  • Type of end connections.

  • Bellows material.

  • Pipe material.

  • Flange specification and material.

  • Type of expansion joint.

  • Accessories.

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How do I change a steam expansion joint?

The expansion joint can be replaced by an expansion joint of a similar design in the cold condition (when the plant is shut down). Shipping brackets should be placed on the expansion joint before un-flanging or cutting the expansion joint from the system.

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How does an expansion bellows function?

A bellows functions by compressing or extending according to the axial motion that is required in the piping system.

Please see video below of a metallic bellows being cycle tested to verify how many cycles a bellows can withstand before failing.
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How are the telescoping liner and liner seal installed?

They are installed before the fabric belt installation. Telescoping liners are welded on each side of the expansion joint, either on inner diameter base of flange or inner diameter of pipe. Liner seal is held by clips that are also welded on the inner diameter of the liners.

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