What must shut off in the event of all compressors shutting down in a pump overfeed system?

In a pump overfeed system, when all compressors shut down, it is critical for the liquid feed to be shut off as well. This is primarily to prevent flooding of the system and to protect the integrity of the equipment. If the liquid feed continues while the compressors are not operational, the system could become overwhelmed, leading to excessive liquid accumulation, which can cause severe mechanical damage and inefficiencies.

When compressors are not functioning, it means that there is no active refrigeration cycle, which relies on the adequate removal of heat from the system to maintain effective operation. Allowing the liquid feed to continue would result in liquid not being vaporized efficiently, leading to potential issues like liquid slugging within the compressors once they are restarted. Therefore, shutting off the liquid feed ensures that the system remains safe and avoids complications during the compressors' downtime.