Issues regarding the fixation of steam pipes
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As shown in the diagram, the pipes in question are the steam inlet pipes and drain pipes of the heat exchanger; they have a DN25 diameter and are made of 304 stainless steel. The steam pressure is 4.2 MPa and the temperature is 400°C. We use U-bolts to secure these pipes. Is there any problem with this method of fixation, taking into account factors such as thermal expansion and contraction? If there are issues, what would be a better way to secure them?
They are all installed in accordance with design specifications, and an outer insulation layer is also applied. Working as a supervisor on-site mainly involves checking whether the installation complies with the drawings and technical requirements. For some technical aspects, one has to consult relevant materials to build a technical foundation; as for the specifications related to design, the basis for such designs can be found in the contracts and design drawings, which are based on relevant standards set by national authorities, ministry regulations, and industry standards.
Hello, these are our own equipment; the steam inlet pipes and drain pipes are only a few meters long. External connection interfaces are provided for the customers, and insulation is required as well. I would like to ask whether it is appropriate to fix the pipes in this way.
With a small diameter and short length, it can be designed in this way, but with a steam pressure of 4.2 MPa and a temperature of 400°C, are you sure that 304 material is suitable?
As long as it’s not a straight tube, there should be no problem. It is recommended to use a π-shaped tube before feeding it into the equipment, and that will resolve any issues
Hello, I would like to ask what’s wrong with seamless steel pipes made of 304 material. Could you please tell me the reason?
At such high temperatures, alloy steel pipes, such as P11, are generally used
Steam pipes must use pipe supports due to insulation requirements; U-bolts cannot be used.
Using 304 stainless steel at a temperature of 400 degrees is not ideal; it’s better to use alloy steel such as 15CrMo or 20G. Our company uses 15CrMo for everything
It wasn’t mentioned, but insulating U-bolts is quite difficult