Must shell-and-tube heat exchangers be equipped with vent and drain ports?
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It was found that there are two heat exchangers in each set, arranged in series one above the other, with the model being BES700-2.5-165-6/9-2I. On the equipment condition diagram, each heat exchanger has a vent and a drain at its floating head, for a total of 4. Since it is a set of heat exchangers, is it sufficient to have only one vent and one drain port? Should the vent port be located on the upper heat exchanger, and the drain port on the lower one? If not, please explain the reason.
It probably won’t work; maybe the problems with those two didn’t occur at the same time?
One purpose: to empty, to purge completely! That’s it. It doesn’t matter whether it’s 2 or 8!
The design of a series connection inherently treats them as one unit; have you seen any design where two sets of bypass circuits are needed for a series connection?； Everyone has thought it through: when failures occur simultaneously, it makes no difference to the system; in such cases, both of them need to be taken offline for handling ； Those arranged in parallel may also have one for repair and one for use.
At a glance, I can tell you’re the owner – you always have such strange ideas； The design of a series connection is such that the units are considered as one entity; if you think that each unit should have its own separate exhaust pipeline, then it becomes necessary to provide bypasses for all the inlet and outlet connections of the heat exchangers in both units ； Otherwise, what is the point of having a separate exhaust line? ；
It depends on the layout; as long as it can ensure complete evacuation and drainage for both devices, that’s sufficient.
Operational scenarios in various situations need to be taken into account; for example, if two devices are available and one of them needs to be repaired, then it may not be possible to release that device.