1. What is a GPM PSI HP Calculator?

Definition: This calculator determines the required horsepower for a pump based on flow rate (GPM), head pressure, and pump efficiency.

Purpose: It helps engineers, technicians, and maintenance personnel properly size pumps for various fluid systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

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

3. Importance of Proper HP Calculation

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 for 85%). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I convert PSI to feet of head?
A: Multiply PSI by 2.31 (for water at standard conditions).

Q2: What's a typical pump efficiency?
A: Centrifugal pumps typically range from 70-90% efficiency (0.7-0.9).

Q3: Does this work for fluids other than water?
A: For other fluids, replace 8.34 with the fluid's specific weight in lbs/gallon.

Q4: Should I add a safety factor?
A: Yes, consider adding 10-20% to the calculated HP for system variations.

Q5: What about motor efficiency?
A: This calculates hydraulic HP. For brake HP, divide by motor efficiency.