Vacuum Pump Capacity Calculation Xls — ((install))

"Which is why," Elias pointed to a valve on the skid, "we don't open the isolation valve 100% at the start. We throttle it. We use the pump's capacity to control the rate of flash."

| | Symbol | Value | Unit | Formula / Notes | |--------------|------------|-----------|----------|----------------------| | Chamber volume | V | 100 | L | Input | | Initial pressure | P1 | 1013 | mbar | Atmospheric | | Final pressure | P2 | 0.01 | mbar | Target vacuum | | Pump nominal speed | Sp | 30 | L/s | From pump curve | | Conductance (pipe) | C | 25 | L/s | Calculate using D/L | | Effective speed | Seff | =1/(1/Sp + 1/C) | L/s | Formula cell | | Pump-down time (theor.) | t | =V/Seff * LN(P1/P2) | sec | Result | | Leak/outgassing load | Q | 0.05 | mbar·L/s | Estimate | | Required Seff for base | S_req | =Q/P2 | L/s | Check if Seff ≥ S_req | vacuum pump capacity calculation xls