Pumpdown Time Estimator

Estimate roughing pumpdown time, effective pumping speed, tube conductance, and ultimate base pressure for a vacuum chamber.

Chamber & Pump
Connecting Tube (optional)
Outgassing (optional)
Pumping Performance
Effective Pumping Speed
10.000L/s
Pumpdown Time
Roughing Time
69.545 s total
1.1591min
Abridged Optics — Pumpdown Time Estimator v1.0t = (V/S_eff)·ln(p₁/p₂). C_tube = 12.1·D³/L (L/s, air 20°C). p_base = q·A/S_eff. Series: 1/C = Σ(1/Cᵢ). Ref: O'Hanlon [1], Chambers [3].

All information, equations, and calculations have been compiled and verified to the best of our ability. For mission-critical applications, we recommend independent verification of all values. If you find an error, please let us know.