Design issues for heat exchanger inlet and outlet valves
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As shown in the process flow (the process fluid leaves the heat exchanger and goes to the stripping tower), considering the type of medium and operating conditions, shut-off valves are provided at both the hot and cold inlets and outlets of the heat exchanger. Generally, are isolation valves not necessary for process material pipelines?
\"Code for Design of Process Piping in Refining Units\" (SH/T 3122-2013): \"5.4 Cut-off valves should not be installed on the inlet and outlet pipes for hot and cold streams in heat exchangers, nor on the inlet and outlet pipes for hot streams in coolers and chillers.\" On the inlet and outlet pipes of the heat exchange equipment that requires maintenance without shutting down during operation, shut-off valves, bypass lines, and bypass shut-off valves should be installed. A purging pipe should be provided on the side of the inlet shut-off valve Fi, while a drain pipe should be installed upstream of the outlet shut-off valve ； When installing a shut-off valve could cause overpressure in the heat exchanger, pressure relief measures should be taken. ”
There is no need to shut it off during operation, and a shut-off valve can be omitted if no control is required
Normally, we install valves here to make maintenance easier
Which heat exchangers are overhauled only during shutdowns?