Party A asked the design institute questions regarding the design of steam pipes
Thread Content
In my workshop’s installation, the LS lines run for a long distance from the boundary area to various workstations; one of these lines goes almost all the way through the installation area, with only a DN25 pipe at its end connected to the condensate water. Today, when steam was introduced, the pipes expanded due to heat, causing them to extend toward the end, and all the pipe supports were displaced out of the pipe tray framework. I haven’t studied much; is this a common issue or a design problem?
Typical compensation is far from sufficient and should not be allowed. Design issues. Doing a few large U-turns should be possible.
There are two aspects to this issue: first, the design institute failed to consider things properly, and the stress compensation design was inadequate; second, there were problems during operation, with steam being introduced too quickly, resulting in severe liquid slugging
Insufficient thermal stress compensation; adding expansion joints or U-bends in between is a design issue
It’s a bit of a subjective judgment there; how do you know he’s steaming too quickly?
I didn’t say it was two aspects – both situations can occur. I also didn’t say that it must be due to steam being introduced too quickly
When calculating stresses, it is necessary to take proper compensation into account for the deformation variables. Moreover, the pipe supports should be extended or installed at an offset to prevent them from falling off. But your title seems weird. This should be considered a question from one user to another, rather than a question from Party A to the design institute, haha
A straight pipe, preferably with a compensator.
Having only a π-type bend is not enough; corresponding fixing brackets are also required.
For the length of the pipeline, its diameter, as well as the temperature and pressure levels, Caesar can be used to roughly calculate the amount of displacement
I also get stuck on this issue when designing normally. I was wondering, when a cold pipeline returns to its original shape, could the pipe supports get stuck on the beam? Also, in a situation like yours, it’s better to have a stress engineer use software to carry out calculations as a precaution. But I assume that the design institute responsible for the main steam pipes will already calculate the stresses