Equipment pressure retention issue. .
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A few days ago, a crack of 3-5 MM appeared on the head of the condenser on the distillation tower; after welding to repair it, a gas-tightness test was conducted on the system. The initial pressure was 0.594 MPa (at a temperature of 23°C); after holding the pressure for 24 hours, it dropped to 0.574 MPa (at a temperature of 21°C). Is the difference in these values within the acceptable range? The pressure holding equipment is a complete distillation tower system, including the distillation tower, condenser, reboiler, and reflux drum. Please ask an expert to assess it!
PL=(P1-P2)*760*V)/0.101325/T P1 is the initial pressure； P2 second pressure ； V volume (L) ； T time (s). The unit is mmHg*L/s; different allowable leakage amounts exist depending on the volume. For example, if 3000L is 300mmHg*L/s, you can calculate it by yourself.