Work out dewatering pump sizing instantly with clear inputs, formula shown and shareable results.
Hydraulic power is flow times head times density times gravity. Dividing by pump efficiency gives shaft power and by motor efficiency the motor rating. Mine dewatering must be sized on peak inflow with standby capacity, because losing dewatering floods the workings and can be catastrophic.
Pump power
Hydraulic power (kW) = flow (m3/h) x 1000 x 9.81 x head (m) / 3,600,000
Motor rating
Motor kW = hydraulic power / pump efficiency / motor efficiency
Loss of mine dewatering can cause flooding and loss of life. Dewatering systems require redundancy, standby power and monitoring under the mine's emergency plan.
Inflow varies with rainfall and with intersection of new water-bearing structures, and pumps fail. Standard practice is full standby capacity, not just a margin, on critical dewatering duties.
Yes. Multistage pumps or booster stations in series keep individual pump pressures within casing limits and allow flexible operation as the mine deepens.