The expansion joint of plate heat exchanger plays the role of deformation compensation in the use of equipment, but not all equipment need to set expansion joint, so under which conditions should expansion joint be set?

1. In the design of fixed plate heat exchanger, if the equipment operates under low temperature differential stress, expansion joint of plate heat exchanger is generally not considered; if the temperature difference between shell and heat exchange tube is large, expansion joint should be considered. The concrete basis is the shell axial stress, the heat exchange tube axial stress and the connection pull-out force between the heat exchange tube and the tube sheet. If one of them can not meet the strength condition, the expansion joint must be set.

2. In fixed plate heat exchanger, due to the temperature difference between shell side fluid and tube side fluid, the temperature changes of shell and tube bundle in working state and non working state are inconsistent, resulting in different thermal deformation of shell and tube bundle in working state. The shell and the tube bundle are fixed together by the tube sheet with high rigidity, which will inevitably cause the deformation of the shell and the tube bundle constrained each other in the working state, resulting in the axial load. In order to avoid shell damage, tube instability and tube pulling off from tube sheet, it is necessary to set a good deformation compensation element expansion joint in shell to reduce the axial load of shell and tube bundle.

The use of expansion joint under the above conditions can enhance the stability of the equipment and reduce the frequency of failure. Because the equipment contains different components of liquid, so the expansion joint is usually made of corrosion-resistant materials.

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