1. What is Hydraulic Pump Horsepower?

Definition: Hydraulic horsepower is the power required to drive a hydraulic pump that delivers a specific flow rate at a certain pressure.

Purpose: This calculator helps engineers and technicians properly size hydraulic pumps for various applications.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( HP \) — Hydraulic horsepower
• \( Q \) — Flow rate (gallons per minute, GPM)
• \( P \) — Pressure (pounds per square inch, psi)
• \( \eta \) — Pump efficiency (0-1, typically 0.85 for most pumps)
• 1714 — Conversion factor (HP = psi × GPM / 1714)

Explanation: The formula calculates the theoretical power required and then divides by the pump efficiency to get actual required power.

3. Importance of Proper HP Sizing

Details: Correct horsepower calculation ensures the pump can deliver required flow at system pressure without overloading the drive motor.

4. Using the Calculator

Tips: Enter the flow rate in GPM, system pressure in psi, and pump efficiency (default 0.85). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical pump efficiency value?
A: Most hydraulic pumps have efficiencies between 0.8-0.9 (80-90%). Gear pumps are typically 0.85, piston pumps up to 0.92.

Q2: Why is 1714 the conversion factor?
A: It comes from the conversion of units (1 HP = 550 ft-lb/sec and 1 gallon = 231 in³).

Q3: Should I add a safety factor?
A: Yes, it's common to add 10-20% to the calculated HP to account for system losses and future demands.

Q4: How does viscosity affect HP requirements?
A: Higher viscosity fluids require more power, especially at startup. Consider this for cold weather operation.

Q5: What if my system has multiple pumps?
A: Calculate HP for each pump separately based on its flow, pressure, and efficiency requirements.