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We’re currently working on creating the new Black Fox Pumps website.
We’ll be launching soon, so stay tuned. For further information, contact us by filling in our contact form.
Please enter your details to unlock the dewatering calculation tools (TDH, friction, engine power & performance curve).
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Calculator 1
TDH = static lift + suction friction + discharge friction. Friction uses the Hazen-Williams or Darcy-Weisbach method with HDPE PN/SDR bore sizing, matching the selected pump's sizing method.
Schematic of the duty below: a pontoon-mounted pump lifting from the sump, up the HDPE line to the discharge pit. The HDPE spec and RL levels update live from your inputs (not to scale).
Used in the header of the generated report.
Static head is the vertical rise from source water level to discharge point.
Add each run of pipe. Fittings allowance adds a % onto discharge friction for bends, valves, etc.
Static head
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Suction friction
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Discharge friction
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Total Dynamic Head
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Suction velocity
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Main velocity
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Discharge pressure
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Calculator 2
Head loss for a single run of pipe. Hazen-Williams uses the standard C-coefficient form; Darcy-Weisbach uses the Colebrook-White friction factor with temperature-dependent viscosity.
HDPE bore is derived from OD and class: PE100 SDR = 160/PN + 1, PE80 SDR = 126/PN + 1. Steel/rubber/layflat use the OD as the bore.
Bore (inside Ø)
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Velocity
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Gradient
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Head loss over run
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Reynolds no.
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Friction factor
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Pressure drop
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Calculator 3
Hydraulic, shaft and driver power from the duty point, then engine sizing with altitude/temperature derating and fuel or energy consumption.
Hydraulic power
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Pump efficiency
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Shaft power
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Driver power required
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In HP
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Head / stage
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Speed
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Rated required
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Selected engine
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Engine load
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Fuel per day
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Cost per day
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Calculator 4
Plot a duty point and the system resistance curve against the selected pump's variable-speed performance family, BEP band and efficiency contours. Choose the pump model from the top bar.
The system curve is H(Q) = static + k·Q². Static is the vertical lift; k is fitted so the curve passes through your duty point.
For each flow point on the red system resistance curve: the head, the speed and shaft power the selected pump needs to meet it, and whether it sits inside the BEP band.