Gear Pump Discharge Pressure Calculation

Gear Pump Discharge Pressure Equation:

\[ Discharge\ Pressure = Inlet\ Pressure + (Displacement \times RPM \times Viscosity\ Factor) \]

Inlet Pressure:

bar

Displacement:

cm³/rev

RPM:

rev/min

Viscosity Factor:

bar/rev

Discharge Pressure:

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1. What is Gear Pump Discharge Pressure?

Gear pump discharge pressure is the pressure at the outlet of a positive displacement gear pump, calculated based on inlet pressure, pump displacement, rotational speed, and fluid viscosity characteristics.

2. How Does the Calculator Work?

The calculator uses the gear pump discharge pressure equation:

\[ Discharge\ Pressure = Inlet\ Pressure + (Displacement \times RPM \times Viscosity\ Factor) \]

Where:

\( Inlet\ Pressure \) — Pressure at pump inlet (bar)
\( Displacement \) — Pump displacement per revolution (cm³/rev)
\( RPM \) — Rotational speed (rev/min)
\( Viscosity\ Factor \) — Factor accounting for fluid viscosity effects (bar/rev)

Explanation: This equation calculates the pressure developed by a positive displacement gear pump based on its mechanical characteristics and operating conditions.

3. Importance of Discharge Pressure Calculation

Details: Accurate discharge pressure calculation is crucial for proper pump selection, system design, ensuring adequate flow rates, and preventing pump damage or system failure.

4. Using the Calculator

Tips: Enter inlet pressure in bar, displacement in cm³/rev, RPM in rev/min, and viscosity factor in bar/rev. All values must be valid positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a positive displacement pump?
A: A positive displacement pump moves fluid by trapping a fixed amount and forcing that trapped volume into the discharge pipe, providing constant flow regardless of pressure.

Q2: How is viscosity factor determined?
A: Viscosity factor is typically determined from pump manufacturer specifications or empirical testing with specific fluids and operating conditions.

Q3: What are typical displacement values for gear pumps?
A: Displacement values range from small (1-10 cm³/rev) for precision applications to large (100+ cm³/rev) for industrial applications.

Q4: What affects gear pump discharge pressure?
A: Discharge pressure is affected by fluid viscosity, pump speed, system back pressure, pump wear, and temperature variations.

Q5: When should this calculation be used?
A: This calculation is essential during pump selection, system design, troubleshooting performance issues, and optimizing operating conditions.