Heat exchanger calculation problems
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On page P97 of GB150, which deals with the selection of external pressure strain coefficient values, the design temperature for 15CrMo is specified as being less than or equal to 475 degrees. When calculating heat exchangers, it is not necessary to verify the external pressure stability of the heat exchange tubes. However, in extreme operating conditions (when the pressure on the tube side is zero or negative), the tubes are subjected to pure external pressure. This raises a question: if the design temperature for the shell side is greater than 475 degrees, is it acceptable to use 15CrMo heat exchange tubes?
It is not recommended to choose it if it exceeds the limits, as the risk is high