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December 14, 2021

It is the force generated by the expansion joint due to the pressure inside. As shown in the picture, we have seen several incorrect ways to calculate the thrust force of an expansion joint. Per the EJMA  Standards, as well as ASME Section VIII B&PV Codes, the Pressure thrust is calculated by multiplying the Bellows Effective Area, corresponding to the mean diameter of the convolutions of the Bellows by the Pressure of the line.

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How do you attach a high pressure joint in a piping system?

In an axial piping system, the expansion joint should be located as close as possible to a main anchor. The first pipe guide should be located at a distance of 4 pipe diameters away from the expansion joint. The second guide should be located a distance of 14 pipe diameters away from the first guide. During installation, the expansion joint should be either welded or flanged into the piping system.

High Pressure Universal Tied Expansion Joint
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What is end thrust?

It is the force generated due to the pressure inside the expansion joint. Pressure thrust is calculated by multiplying the area of the mean bellows diameter by the pressure.

Bull 02 a
Bellows “PA” (pressure x area) load
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