Pump Flow Formula:
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Definition: This calculator estimates the flow rate of a water pump based on power input, pump efficiency, head pressure, and a constant.
Purpose: It helps engineers, plumbers, and irrigation specialists determine the expected flow rate of a pump system.
The calculator uses the formula:
Where:
Explanation: The formula relates the mechanical power input to the hydraulic power output, accounting for system losses through the efficiency factor.
Details: Accurate flow rate estimation ensures proper system design, adequate water delivery, and energy-efficient operation.
Tips: Enter the pump power in horsepower, efficiency (default 0.8), head in feet, and constant (default 3960 for water). All values must be > 0.
Q1: Why is the constant 3960?
A: This value comes from unit conversions (1 hp = 550 ft-lb/s, 1 gallon water = 8.34 lb, 1 minute = 60 s).
Q2: What's a typical pump efficiency?
A: Most pumps operate between 50-85% efficiency (0.5-0.85), with centrifugal pumps typically around 70-80%.
Q3: How do I determine total dynamic head?
A: It's the sum of static head (vertical distance) and friction losses in the piping system.
Q4: Can I use this for other fluids besides water?
A: Yes, but you'll need to adjust the constant based on the fluid's specific gravity.
Q5: Does this account for system curve effects?
A: No, this is the theoretical maximum flow. Actual flow depends on the system curve intersection with the pump curve.