1. What is Water Pump Horsepower Calculation?

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

Purpose: It helps engineers, plumbers, and irrigation specialists properly size water pumps for various applications.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( HP \) — Horsepower required
• \( Q \) — Flow rate (gallons per minute)
• \( H \) — Total head (feet)
• \( \eta \) — Pump efficiency (0-1)
• 8.34 — Weight of water (lbs/gallon)
• 3960 — Conversion factor (ft-lb/min to HP)

Explanation: The formula calculates the power needed to move water against gravity and system resistance.

3. Importance of Proper Pump Sizing

Details: Correct horsepower calculation ensures energy efficiency, prevents pump overload, and extends equipment life.

4. Using the Calculator

Tips: Enter flow rate in GPM, total head in feet, and pump efficiency (default 0.85). Efficiency values range from 0 to 1 (0% to 100%).

5. Frequently Asked Questions (FAQ)

Q1: What is total head?
A: Total head is the vertical distance plus friction losses in the piping system, measured in feet.

Q2: What's a typical pump efficiency?
A: Most pumps operate at 50-85% efficiency. High-efficiency pumps may reach 90%.

Q3: Should I round up the calculated HP?
A: Yes, always select the next available pump size above your calculated value.

Q4: Does this include safety factors?
A: No, consider adding 10-20% to the calculated HP for system variations.

Q5: How do I find my system's total head?
A: Measure vertical lift plus calculate friction losses using pipe size, length, and flow rate.