Maximum tube side pressure 800 psi (determined by safeties on boiler for example) ![]() The shell must be protected for thermal expansion. Hazard analysis shows isolation valves on the inlet and outlet of this exchanger, the potential exists for the shell side to be full of stock when isolated and steam to be in the tubes. Maximum tube side pressure 150 psi (determined by safeties on boiler for example) Maximum shell side pressure 90 psi (determined by pump size, nitrogen line blow stab ins, etc.) A hazard analysis around the equipment to be protected must be performed in order to determine what the safety device must be. A pressure relief valve (PSV as you call it) is used for relieving larger volumes due to process of external hazards. ![]() Typicaly a thermal relief valve (TSV as you call it) is a low flow relief valve used on equipment protect against over pressurization due to thermal expansion. First let me preface my response by saying that the sizing and application of safety relief devices is something that should be done only by a qualified individual.
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