1. What is Pump Efficiency?

Pump efficiency (η) is a measure of how effectively a pump converts the input power (horsepower) into useful work output (flow and pressure). It's expressed as a percentage, with higher values indicating better performance.

2. How Does the Calculator Work?

The calculator uses the pump efficiency equation:

Where:

• \( Q \) — Flow rate in gallons per minute (GPM)
• \( H \) — Total head in feet (ft)
• \( SG \) — Specific gravity of the fluid (unitless)
• \( HP \) — Input horsepower (HP)
• 3960 — Conversion factor

Explanation: The equation calculates the ratio of hydraulic power output to mechanical power input, showing what percentage of input power is converted to useful work.

3. Importance of Pump Efficiency

Details: Pump efficiency is crucial for energy conservation, operational cost reduction, and system performance evaluation. Higher efficiency means lower energy costs and better sustainability.

4. Using the Calculator

Tips: Enter all values in the specified units. Flow rate in GPM, head in feet, specific gravity (1.0 for water), and horsepower. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a good pump efficiency value?
A: Typical centrifugal pumps range from 40-85% efficiency. Values above 70% are generally considered good for most applications.

Q2: Why is specific gravity important?
A: Specific gravity accounts for fluid density differences compared to water. It affects the power required to move the fluid.

Q3: What affects pump efficiency?
A: Factors include pump design, operating point relative to BEP (Best Efficiency Point), wear, fluid viscosity, and system design.

Q4: How can I improve pump efficiency?
A: Proper sizing, regular maintenance, operating near BEP, using variable speed drives, and minimizing system restrictions can improve efficiency.

Q5: Is 100% efficiency possible?
A: No, all pumps have losses due to friction, leakage, and other factors. The theoretical maximum is below 100%.