1. What is Pump Power Calculation?

Definition: This calculator determines the required horsepower for a pump based on flow rate, total head, fluid density, and pump efficiency.

Purpose: It helps engineers and technicians properly size pumps for various fluid transfer applications.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( HP \) — Pump power (horsepower)
• \( Q \) — Flow rate (gallons per minute)
• \( H \) — Total head (feet)
• \( \rho \) — Fluid density (pounds per gallon)
• \( \eta \) — Pump efficiency (decimal)

Explanation: The formula calculates the theoretical power required to move a fluid against gravity and system resistance.

3. Importance of Pump Power Calculation

Details: Accurate power calculation ensures proper pump selection, energy efficiency, and system reliability.

4. Using the Calculator

Tips: Enter the flow rate in GPM, total head in feet, fluid density (default 8.34 lb/gal for water), and pump efficiency (default 0.85). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is total head in pump calculations?
A: Total head is the sum of static head, friction head, and pressure head that the pump must overcome.

Q2: Why is 3960 used in the formula?
A: 3960 is a conversion factor that combines unit conversions for GPM, feet, and horsepower.

Q3: What's a typical pump efficiency value?
A: Most pumps operate between 50-85% efficiency, with centrifugal pumps typically around 70-85%.

Q4: How does fluid density affect power requirements?
A: Denser fluids require more power to pump at the same flow rate and head conditions.

Q5: Should I add a safety factor to the calculated power?
A: Yes, it's common practice to add 10-20% to the calculated power to account for system variations.