Normal operating pressure – the expected pressure of the process. Steps should be taken to account for potential failures of cooling/heating streams to prevent or minimize damage to equipment and injury to operators. ![]() ![]() Minimum design temperature – lowest mean metal temperature expected in operation minus a margin (typically 25☏). Maximum design temperature – highest mean metal temperature expected in operation plus a margin (typically 50☏). Ĭommon margins used for pressure vessel design temperatures are as follows: Using a temperature margin to account for all possible uncertainties in the process helps ensure safety and stays within ASME codes. Some such requirements are:ĭetermining a maximum and minimum design temperature for a pressure vessel is important because the strength of metals decreases as temperature increases. The process requirements usually dictate specifications and parameters that the pressure vessel must fulfill.
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