Gear Pump CC Calculator – Easy Guide to Calculate Pump Displacement
Use a gear pump cc calculator to quickly find the displacement of your pump in cubic centimeters (cc). This helps you select the right pump size for hydraulic systems and improve efficiency. Follow this simple guide to learn how to calculate gear pump cc step by step.
Gear Pump CC Calculator
How to Use a Gear Pump CC Calculator
- 1Enter gear outer diameter (OD): Measure the full diameter of the gear in millimeters.
- 2Enter gear inner diameter (ID): Measure the shaft hole or root diameter.
- 3Enter gear width (thickness): Measure the width of the gear in millimeters.
- 4Enter number of gears: Usually 2 for standard gear pumps.
- 5Click calculate: The calculator will show displacement in cc/rev (cubic centimeters per revolution).
- Always use accurate measurements.
- Use consistent units (mm recommended).
- Double-check inputs before calculating.
How to Calculate Gear Pump CC (Step-by-Step)
Calculating the displacement of a gear pump requires knowing the physical dimensions of the gears. Use the formula below for manual calculation.
Step-by-Step Example
Given Data:
- Outer Diameter (OD) = 80 mm
- Inner Diameter (ID) = 40 mm
- Width = 30 mm
- Number of Gears = 2
1. Square the diameters:
OD² = 80 × 80 = 6400
ID² = 40 × 40 = 1600
2. Subtract:
6400 - 1600 = 4800
3. Multiply by π / 4:
π/4 ≈ 0.785
4800 × 0.785 = 3768
4. Multiply by width:
3768 × 30 = 113040
5. Multiply by number of gears:
113040 × 2 = 226080
6. Convert to cc:
226080 ÷ 1000 = 226.08 cc/rev
Final Answer: Gear Pump Displacement = 226.08 cc/rev
Gear Pump CC Conversion Chart
Reference table for flow rates based on various displacement sizes and RPM speeds.
| CC/Rev | Liters/Min @ 1000 RPM | Liters/Min @ 1500 RPM | Liters/Min @ 2000 RPM |
|---|---|---|---|
| 5 cc | 5 L/min | 7.5 L/min | 10 L/min |
| 10 cc | 10 L/min | 15 L/min | 20 L/min |
| 20 cc | 20 L/min | 30 L/min | 40 L/min |
| 50 cc | 50 L/min | 75 L/min | 100 L/min |
| 100 cc | 100 L/min | 150 L/min | 200 L/min |
Note: Flow Rate (L/min) = CC × RPM ÷ 1000
Fluid Viscosity Correction for Gear Pump CC Sizing
Most centrifugal pump specs are rated using water as the baseline fluid. If your Gear Pump CC handles viscous fluids like oils, chemical slurries, or non-Newtonian mixtures, the pump's flow, head, and efficiency will degrade due to viscous drag inside the impeller:
Applying viscosity correction factors (like those from the Hydraulic Institute charts) is vital to avoid motor overload and ensure that the selected pump delivers target outputs under actual operating conditions.
Transient Flow and Water Hammer Mitigation in Gear Pump CC
Water hammer is a transient pressure surge that occurs when a fluid in motion is forced to stop suddenly, such as when a valve closes rapidly in a Gear Pump CC line. This creates a shockwave that travels through the pipe, potentially causing pipe rupture or joint leaks.
Mitigation strategies include installing surge arrestors, slow-closing valves, or loop geometries to absorb the shockwaves. Sizing expansion tanks and surge valves based on your Gear Pump CC flow parameters is essential for protecting delicate pressure sensors and instrumentation.
Frequently Asked Questions (FAQs)
The CC, or cubic capacity, of a gear pump is calculated by utilizing the internal dimensions of the gears, including the gear width and the distance between teeth. This precise geometric measurement reveals exactly how much fluid the pump displaces during one complete revolution of the shaft.
CC per revolution represents the specific volume of hydraulic fluid pushed through the pump every time the internal gears complete one full turn. This fundamental specification is crucial for determining the overall flow rate when you multiply the capacity by the motor's operating speed in RPM.
The CC rating directly dictates the hydraulic flow rate; a larger capacity pump will displace a much greater volume of fluid at any given RPM. Accurately matching the pump's displacement to the system's requirements ensures optimal actuator speed and efficient operation of heavy machinery.
Calculating displacement is incredibly important to guarantee that the pump can supply the required volume of fluid to power hydraulic cylinders and motors effectively. Using an improperly sized pump leads to sluggish equipment performance, excessive heat generation, and wasted mechanical energy.
Generally, you cannot change the fixed CC of a standard gear pump without physically replacing the internal gear set or the entire pump housing. If your hydraulic system demands a different flow capacity, upgrading to a properly sized new unit is usually the most reliable and efficient solution.