Is it necessary to open the vent when reversing a large compressor unit?
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During system operation, if the compressor is switched, for example from unit a to unit b, is it necessary to open the vent valve of this device when starting up unit b?
During system operation, if the compressor is switched, for example from unit a to unit b, is it necessary to open the vent valve of this device when starting up unit b? There are several scenarios: 1. After a major overhaul of the unit, before starting up B, it is necessary to purge it with nitrogen three times, and the vent valve must be opened. ⒉The unit had never been used before; no nitrogen purging was carried out, and a slight positive pressure was applied. Once again, nitrogen needs to be filled in, and the air valve must be opened for purging three times ； ⒊The unit was previously in operation; after it was shut down, a slight positive pressure of the operating medium or nitrogen was maintained inside the unit, so there was no need to open the vent valve of this equipment.
Following the third method in 2#, after the unit is shut down, the machine is restarted without releasing air. Can it ensure a smooth transition in pressure?
A reciprocating machine will work; it meets the requirements for gradual switching. The purpose of keeping it open is to facilitate replacement and prevent oxygen from entering, which could pose a risk