Why should cut-off valves not be installed on the inlet and outlet pipes of heat exchangers?
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Question: Why are cut-off valves not suitable for installation on the inlet and outlet pipes for hot and cold fluids in heat exchangers, as well as on the inlet and outlet pipes for hot fluids in coolers and condensers? And why, under normal requirements for process design, are pipes with diameters of DN 32, 65, 125, and 175 not recommended unless there are special requirements?
It is not advisable to install cut-off valves; this cannot be generalized – an analysis of the specific situation is required. For example, gas pipes leading from the top of a tower to a condenser generally do not have cut-off valves, while ordinary coolers do require such valves. Under normal requirements, unless there are special specifications, it is not advisable to use pipes with diameters of DN 32, 65, 125, or 175; there’s no real reason for this, it’s just a rule that has been established