Wet Well Cycle Time Calculator
Pump starts per hour for a lift-station wet well — worst case checked automatically.
Minimum cycle time always lands when inflow is half the pump rate. Alternating duty pumps halves the starts each motor sees.
Formula
Disclaimer: This tool is for general informational and estimation purposes only and is not professional financial, tax, accounting or legal advice. All figures are estimates — verify with a qualified professional before making decisions. Read the full disclaimer.
Wet Well Cycle Time Calculator is a free wet well sizing for pump engineers, plumbers and plant designers — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Wet Well Cycle Time Calculator
Pump starts per hour for a lift-station wet well — worst case checked automatically. The calculation implements T = V/Q_in + V/(Q_p−Q_in); worst case at Q_in = Q_p/2 → T_min = 4V/Q_p (Metcalf & Eddy, Wastewater Engineering — pump stations). Minimum cycle time always lands when inflow is half the pump rate. Alternating duty pumps halves the starts each motor sees.
How to use Wet Well Cycle Time Calculator
- 1Enter Working volume (start↔stop) in m³.
- 2Enter Pump capacity in L/s.
- 3Enter Current inflow in L/s.
- 4Read Cycle time at this inflow, Starts per hour, Worst-case starts/hour (Q_in = Q_p/2) instantly — no submit button needed.
- 5Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Wet Well Cycle Time Calculator?
- ✓Implements the standard formula — T = V/Q_in + V/(Q_p−Q_in); worst case at Q_in = Q_p/2 → T_min = 4V/Q_p
- ✓Reference cited on-page: Metcalf & Eddy, Wastewater Engineering — pump stations
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Built-in engineering verdict flags out-of-range results instantly
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Wet Well Cycle Time Calculator use?+
It computes T = V/Q_in + V/(Q_p−Q_in); worst case at Q_in = Q_p/2 → T_min = 4V/Q_p, per Metcalf & Eddy, Wastewater Engineering — pump stations. The formula is displayed under the result.
What should I keep in mind when using this calculator?+
Minimum cycle time always lands when inflow is half the pump rate. Alternating duty pumps halves the starts each motor sees.
Can I use this for pump selection?+
Use it to establish the duty (flow, head, NPSH, power) and then pick a pump whose curve passes through that point near best efficiency. The tool gives you the engineering numbers a supplier will ask for.
Is the Wet Well Cycle Time Calculator free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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