1. What is the Pump Flow Rate Calculation?

Definition: This calculator estimates the flow rate of a pump in gallons per minute (GPM) based on horsepower, efficiency, and head.

Purpose: It helps engineers and technicians determine the expected flow rate of a pump given its operating parameters.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Flow rate (gallons per minute)
• \( HP \) — Horsepower
• \( \eta \) — Pump efficiency (0-1)
• \( H \) — Head (feet)

Explanation: The formula relates the mechanical power input (HP) to the hydraulic power output (flow against head), accounting for pump efficiency.

3. Importance of Pump Flow Rate Calculation

Details: Accurate flow rate estimation ensures proper pump selection, system design, and energy efficiency in fluid transport systems.

4. Using the Calculator

Tips: Enter the pump horsepower, efficiency (default 0.8), and head in feet. All values must be > 0, with efficiency between 0 and 1.

5. Frequently Asked Questions (FAQ)

Q1: What is the constant 3960 in the formula?
A: This is the conversion factor that relates horsepower to foot-pounds per minute (1 HP = 3960 ft-lb/min).

Q2: What's a typical pump efficiency value?
A: Most pumps operate between 70-90% efficiency (0.7-0.9), with centrifugal pumps typically around 80%.

Q3: How is head different from pressure?
A: Head is the height a pump can lift fluid, measured in feet, while pressure is force per unit area. They are related by fluid density.

Q4: Can I use this for any fluid?
A: This formula works for water. For other fluids, you'd need to adjust for different specific gravity.

Q5: What if my efficiency is expressed as percentage?
A: Convert percentage to decimal (e.g., 85% efficiency = 0.85) before entering.