Wells & water/ CALCULATOR
Well-pump cycle-rate screening
Estimate one pressure-tank draw-and-refill cycle under a steady water demand below pump capacity.
Use published or measured drawdown between the actual cut-out and cut-in settings.
Use flow at the system operating head, not an unrestricted maximum-flow label.
This model requires demand to remain below pump delivery.
Pump-off draw time
1.50 min
Pump-on refill time
1.50 min
Complete cycle time
3.00 min
Estimated starts per hour
20.0 starts/h
Pump run time per hour
30.0 min/h
Constant demand, constant pump delivery, full usable drawdown each cycle and no variable-speed control. Real fixtures vary, switch and tank behavior have tolerances, and pump manufacturers set allowable starts and minimum run time. Treat the result as a diagnostic screen, not a control setting.
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Wells & water
Bladder pressure-tank drawdown estimate
Estimate the water delivered between pump cut-out and cut-in pressures from a precharged bladder tank.
Wells & water
Pressure-tank nominal size from required drawdown
Estimate the nominal bladder-tank volume needed to provide a chosen usable drawdown between switch pressures.