Under what circumstances is heat tightening necessary?
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For example, regardless of the operating temperature of the distillation tower under normal circumstances, as long as the bolts are tightened, the steam purge temperature is, and the operating temperature is high, as long as the temperature difference between the three is relatively large (the temperature becomes higher), heat tightening is required.
For newly built devices, the sealing points must be disassembled after maintenance and must be heat-tightened after startup.
Are there any specific temperature value requirements?
The heat tight temperature is generally 200-250℃.
For your question, it is recommended that you refer to the provisions of 7.3.7 of "GB 50235-2010 Construction Specifications for Industrial Metal Pipe Engineering"； You can also refer to the provisions of 7.3.1 of "GB 50184-2011 Specifications for Construction Quality Acceptance of Industrial Metal Pipe Engineering". for your information
study* Okay, we don’t leak and never get hot and tight.