Design of high-temperature manholes
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I would like to ask my colleagues how high-temperature manholes should be designed. Standard manholes as defined by standards generally can only withstand temperatures up to 300 degrees. How should it be designed if the temperature is as high as 600-700? Heat-resistant materials should be used as lining inside the manhole, but how should the specific design be carried out? I earnestly ask for guidance or images; thank you~
How high is the temperature? Personally, I think it has something to do with the materials.
This hasn’t been designed yet; I’ll just talk about the materials I just read. The design should still be carried out using conventional methods; however, when selecting the allowable stress, the material’s creep limit or endurance strength should be used, as this ensures sufficient strength. But it is said that this approach isn’t entirely safe either. For specific designs, you can look into the relevant designs of nuclear power plant reactors; it might be covered there. Another issue is the sealing and leakage of manholes; at high temperatures, gasket materials generally cannot be used. I’ve seen many people mention lens gaskets, but I’ve never actually seen any of them. Another aspect is to prevent the bolts from loosening at high temperatures; certain measures must be taken to ensure that they do not loosen too much, which could lead to leaks. I mostly saw it in this literature; it is for reference only. http://www.docin.com/p-413606392.html
It depends on the specific processing requirements. A lining can be used, which allows the material used for the manhole to be of a lower quality. As for how to do this specifically, the technology is quite mature in the field of catalytic cracking; one could look into that area
For the high-temperature manhole you mentioned, I think we can refer to the design of boiler manholes.
I’m not sure; please check it in other sources