Is a bypass pipe necessary for heat exchangers?
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Is it necessary to install a bypass pipe for the heat exchanger piping? Are there any regulatory requirements? Please discuss.
It can be included or not, depending on the process requirements. But it’s better to set it.
Whether to design this topic should be answered by the designer; depending on the requirements of the process, some elements are necessary while others need not be included. Understand the principles of the equipment in front of you; it’s best to lay a solid foundation first when it comes to design issues. In learning*, emphasis is placed on the principles.
SH/T 3122-2013 \"Code for the Design of Process Piping in Refining Units\" https://bbs.hcbbs.com/forum.php?mod=viewthread&page=1&tid=1541379
The process department will decide based on the actual situation!
Taking into account factors such as failures, cleaning, and the convenience of starting up and shutting down, installing a bypass increases operational flexibility; overall, the advantages outweigh the disadvantages, but it is also necessary to consider process and site conditions
It is set according to process requirements; if there are specific process demands regarding the heat exchange amount – which cannot be too high or too low – or if there is a need for maintenance and switching, then such settings are necessary for regulation and switching. If there are no specific requirements regarding the heat transfer amount (for example, if it is desired that the temperature of the medium to be cooled drop as much as possible), then a bypass is not necessary; the excess cooling source can be used directly for cooling.