1. What is Pump Head Calculation?

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

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( H \) — Pump head (feet)
• \( HP \) — Horsepower
• \( Q \) — Flow rate (gallons per minute)
• \( \rho \) — Fluid density (pounds per gallon)
• \( \eta \) — Pump efficiency factor (0-1)

Explanation: The formula converts horsepower to head by accounting for flow rate, fluid density, and pump efficiency.

3. Importance of Pump Head Calculation

Details: Proper pump head calculation ensures adequate pressure for system requirements while avoiding oversizing that wastes energy.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is the constant 3960 in the formula?
A: This is a conversion factor that relates horsepower, flow rate, and head in US customary units.

Q2: What's a typical efficiency factor for pumps?
A: Centrifugal pumps typically range from 0.7 to 0.9, with 0.85 being a common default value.

Q3: How do I find fluid density?
A: Water is 8.34 lb/gal. For other fluids, consult material specifications or density tables.

Q4: Does this include system head losses?
A: No, this calculates the pump's capability. System head losses must be added to determine actual requirements.

Q5: What if my pump has variable speed?
A: This calculation is for a specific operating point. Variable speed pumps require additional analysis.