Can expansion joints be installed in the middle of stainless steel chemical pipelines?
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There is a stainless steel chemical pipeline in the reservoir (DN200, carrying alcohol and benzene-based liquid chemicals at a pressure of 1.0 MPa). Perhaps due to inadequate design, this pipeline has a very long straight section; during thermal expansion in summer, it pushes the lateral pipes at its ends out of place. It’s not possible to fix them firmly, so I wonder whether it would be feasible to install a stainless steel bellows expansion joint (commonly known as a flexible joint) at some point along the pipeline I would appreciate it if fellow sea travelers could advise me on whether this approach meets the regulatory standards.
The temperature of the medium should be high, resulting in significant thermal expansion. Arched expansion joints similar to those used in steam pipelines can be considered
That’s possible, or a bow-shaped expansion joint can be used.
I would like to ask, what does it mean that fillers are not allowed?
This post was last edited by cjgj008 on 2017-9-12 at 19:22. The medium is at room temperature; mainly in summer, when the weather is extremely hot, the straight pipe sections extend along the direction of the pipeline, which causes lateral displacement. Natural compensation is an option, but there is another layer of piping several dozen centimeters above this pipeline, so this method cannot be used
Expansion joints can also be installed in the horizontal direction; radial displacements up and down along the pipeline can be compensated through movements left and right in the horizontal plane
Adding one or several U-shaped bends will solve the problem
The drawings have been sent over. I’ll help you diagnose it for free. Installing a door-type compensator (π type) is the best choice.
Is the conveying medium at room temperature? It shouldn’t happen at room temperature; could it be that the pressure buildup is caused by the change in the temperature of the liquid medium? If that’s the case, try to ensure that the medium doesn’t flow, and avoid closing both ends completely