[ \frac1S_eff = \frac1S_pump + \frac1C_pipe ]
VACUUM PUMP CAPACITY CALCULATOR v1.0 INPUT PARAMETERS: Chamber Volume (liters) 6000 Initial Pressure (mbar abs) 1013 Final Pressure (mbar abs) 5 Desired Pump-Down Time (s) 180 Pipe Conductance (L/s) 1200 Correction Factor (outgassing/leak) 1.15 vacuum pump capacity calculation xls
[ S_ideal = \fracVt \ln\left(\fracP_iP_f\right) = \frac6000 \text L180 \text s \ln\left(\frac10135\right) ] [ \ln(202.6) = 5.31 ] [ S_ideal = 33.33 \times 5.31 = 177 \text L/s ] [ \frac1S_eff = \frac1S_pump + \frac1C_pipe ] VACUUM