GE Water Pump Motor Sizing Calculator

GE Water Pump Motor Sizing:

Motor Size (HP) = (Flow Rate × Total Head × Specific Gravity) / (3960 × Pump Efficiency × Motor Efficiency)

Flow Rate:

GPM (gallons per minute)

Total Head:

feet

Specific Gravity:

(water = 1.0)

Pump Efficiency:

Motor Efficiency:

Service Factor:

(typically 1.15)

Theoretical Horsepower:

Brake Horsepower (BHP):

Required HP (with SF):

Recommended Motor Size:

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1. What is GE Water Pump Motor Sizing?

GE Water Pump Motor sizing determines the appropriate horsepower rating for a motor to efficiently drive a water pump based on flow rate, head pressure, and system characteristics. Proper sizing ensures reliable operation and energy efficiency.

2. How Does the Calculator Work?

The calculator uses the standard pump power equation:

Motor Size (HP) = (Flow Rate × Total Head × Specific Gravity) / (3960 × Pump Efficiency × Motor Efficiency)

Where:

Flow Rate — Measured in gallons per minute (GPM)
Total Head — Total dynamic head in feet
Specific Gravity — Relative density of fluid (water = 1.0)
Pump Efficiency — Typically 50-85% for centrifugal pumps
Motor Efficiency — Typically 80-95% for GE motors
Service Factor — Safety margin (typically 1.15 for continuous duty)

Explanation: The calculation determines theoretical power required, then accounts for pump and motor efficiencies, and finally applies a service factor to determine the appropriate motor size.

3. Importance of Proper Motor Sizing

Details: Correct motor sizing prevents underpowered operation (which can cause motor failure) and oversized motors (which waste energy and reduce efficiency). GE motors perform best when properly matched to their load.

4. Using the Calculator

Tips: Enter accurate system parameters. For variable loads, use worst-case scenario values. Consult GE motor specifications for exact efficiency values of specific models.

5. Frequently Asked Questions (FAQ)

Q1: Why is service factor important?
A: The service factor provides a safety margin for temporary overload conditions and accounts for calculation uncertainties.

Q2: What are standard GE motor sizes?
A: GE produces motors in standard sizes: 0.5, 0.75, 1, 1.5, 2, 3, 5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 75, 100, 125, 150, 200 HP and larger.

Q3: How does voltage affect motor selection?
A: While this calculator determines HP, actual motor selection must also consider available voltage (120V, 208V, 230V, 460V, etc.) and phase (single or three-phase).

Q4: What if my calculated HP falls between standard sizes?
A: Always round up to the next available standard size to ensure adequate power.

Q5: Are there special considerations for submersible pumps?
A: Yes, submersible pump motors may have different efficiency characteristics and may require additional derating factors.