Seeking guidance on gasket specifications and usage
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Our heat exchanger has a design pressure of 3.04 Mpa for the shell side, and the outlet pipeline is DN200. Can a DN200, PN2.5 metal-wound gasket be used on the first flange coming out of the heat exchanger?
It does not meet the maximum allowable operating pressure, so it cannot be used directly.
For this type of gasket, should copper gaskets be chosen? It is best to use copper gaskets after heating them up and annealing them.
Increase the pressure rating. What is the design temperature? For carbon steel, PN40 should be sufficient; for stainless steel, it might be PN63
The temperature is around 50 degrees. What impact will it have if it is used directly?
Flanges are areas prone to leakage, so the gaskets used must be appropriate. According to SH 3407 standards, the gaskets for PN25 flanges are a bit too small; it is recommended to use gaskets of a higher grade.
Your value refers to the design pressure of the heat exchanger, which is different from the operating pressure. What’s important is to determine what the operating pressure is. Additionally, when considering the operating pressure, it’s necessary to take into account the fact that as the temperature rises, the allowable pressure of the material decreases. However, since your operating temperature is 50°C, the operating pressure should be the key factor to consider