1. What is Pump Horsepower Calculation?

Pump horsepower calculation determines the power required to drive a pump based on flow rate, head, fluid properties, and pump efficiency. It's essential for proper pump selection and motor sizing in fluid systems.

2. How Does the Calculator Work?

The calculator uses the pump horsepower formula:

Where:

• \( HP \) — Pump horsepower (hp)
• \( Q \) — Flow rate (gallons per minute)
• \( H \) — Total dynamic head (feet)
• \( SG \) — Specific gravity of fluid
• \( Eff \) — Pump efficiency (percentage)

Explanation: The formula calculates the theoretical power required to move fluid against system resistance, accounting for pump efficiency losses.

3. Importance of Pump Horsepower Calculation

Details: Accurate horsepower calculation ensures proper motor sizing, prevents underloading or overloading, optimizes energy consumption, and extends equipment lifespan.

4. Using the Calculator

Tips: Enter flow rate in GPM, head in feet, specific gravity (1.0 for water), and pump efficiency as percentage. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is specific gravity?
A: Specific gravity is the ratio of fluid density to water density. Water has SG=1.0, while other fluids vary (oil ~0.8, brine ~1.2).

Q2: How is pump efficiency determined?
A: Pump efficiency is typically provided by manufacturers and ranges from 50-85% depending on pump type, size, and operating conditions.

Q3: What is total dynamic head?
A: Total dynamic head includes static head, friction losses, and pressure differences that the pump must overcome.

Q4: Should I add a safety factor?
A: Yes, typically add 10-20% safety factor to calculated horsepower for motor selection to account for variations and future requirements.

Q5: Can this formula be used for all pump types?
A: This formula works for centrifugal pumps. Positive displacement pumps require different calculations considering viscosity and pressure.