1. What is a Pump Head to Horsepower Calculator?

Definition: This calculator converts pump head and flow rate into required horsepower, accounting for fluid density and pump efficiency.

Purpose: It helps engineers and technicians determine the power requirements for pumping systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( HP \) — Horsepower
• \( Q \) — Flow rate (gallons per minute)
• \( H \) — Head (feet)
• \( \rho \) — Fluid density (pounds per gallon)
• \( \eta \) — Pump efficiency (decimal)

Explanation: The formula calculates the power needed to move a specific volume of fluid against a given head pressure, adjusted for pump efficiency.

3. Importance of Horsepower Calculation

Details: Proper horsepower estimation ensures correct pump selection, energy efficiency, and system reliability.

4. Using the Calculator

Tips: Enter flow rate in GPM, 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 the 3960 constant in the formula?
A: It's a conversion factor that combines various unit conversions to give horsepower directly.

Q2: What's a typical pump efficiency value?
A: Most pumps operate between 70-90% efficiency (0.7-0.9). The default 0.85 represents 85% efficiency.

Q3: How does density affect horsepower?
A: Higher density fluids require more power to pump. Water is 8.34 lb/gal, while heavier fluids increase HP needs.

Q4: What if my pump has multiple stages?
A: Multiply single-stage HP by the number of stages for total power requirement.

Q5: Should I add a safety factor?
A: Yes, consider adding 10-20% to the calculated HP for operational contingencies.