R1-A Pumpdown Curve
Log-scale pressure vs time • Watch how pressure drops through different flow regimes
Chamber Volume:
10 L (small)
50 L (R1-A typical)
200 L (large)
Pump Speed:
5 m³/h
16 m³/h (R1-P-RP)
40 m³/h
Leak Rate:
None (ideal)
0.001 mbar·L/s (good seal)
0.1 mbar·L/s (leaky)
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Viscous Flow
Transition
Molecular Flow
Ultimate
Elapsed Time
0 s
Simulation paused
Chamber Pressure
950 mbar
Atmospheric (~950 mbar at Selkirk)
Flow Regime
Viscous
Mean free path ≪ pipe diameter
Pump Throughput
0 mbar·L/s
Q = S × P