Gear Pump Size Calculator

Enter value and click on calculate. Result will be displayed.

Outer Daimeter Of Gear:
Width Of Gear:
Center distance of Gears:
Gear Pump Size:
GPM @ 1200 RPM

To calculate the size of a gear pump, several factors need to be taken into account, including flow rate, pressure, and the type of fluid being pumped. Here's a basic formula and an outline of the steps for gear pump sizing:

Formula:

The basic formula for the size of a gear pump is:

Where:

  • Q = Flow rate (in liters per minute or gallons per minute)
  • N = Number of gear teeth (typically 2 for a basic gear pump)
  • D = Pitch diameter of the gear (in inches or mm)
  • L = Length of the gear teeth (in inches or mm)
  • RPM = Speed of the pump (in revolutions per minute)

Steps for Sizing:

  1. Determine the desired flow rate (Q):

    • This is typically given in liters per minute (LPM) or gallons per minute (GPM).

  2. Determine the operating pressure:

    • The pressure at which the pump will operate affects the pump's displacement. Higher pressures may require more robust materials and designs.

  3. Determine the fluid characteristics:

    • The viscosity of the fluid affects the pump's performance. More viscous fluids will require more power to pump.

  4. Select the pump material and tolerances:

    • Depending on the fluid being pumped (e.g., oil, water, chemical), the materials for the gears, casing, and seals should be chosen appropriately.

  5. Choose the correct gear profile:

    • Gear profiles include external, internal, or planetary configurations. Each has advantages depending on the application.

  6. Adjust based on efficiency:

    • Pump efficiency typically ranges between 85-95%, depending on design and operating conditions. This can be used to adjust the flow rate if necessary.

Example:

If you're given the following values:

  • Desired flow rate: 30 LPM
  • Gear diameter (D): 5 cm
  • Gear length (L): 3 cm
  • Pump speed (RPM): 1500