Last updated: September 2, 2020

The formula for converting “cc/rev to LPM” is quite simple. But before knowing just one formula, the basic concept must be understood. cc/rev (centimeter cube per revolution) is a general term in a hydraulic system for the displacement capacity of a pump.1 While LPM (liter per minute) is the flow rate of hydraulic fluid.

For converting cc/rev to LPM we need pump speed or in other words, the number of revolution of the pump in one minute.

## cc/rev to LPM (centimeter cube per revolution to Liter per minute)

The diagram shows a fixed displacement pump having 90 cc/rev displacement capacity. Q indicates the flow rate of the pump and P indicates the power of the pump.

Now, suppose the pump is rotating with the speed of 2222 RPM (The pump can be powered by an engine, gearbox, or electric motor).

Flow = (Displacement x RPM)/1000

Flow is in Liter per minute (LPM), Displacement is cc per revolution while RPM is rotation per minute.

Q = (90 x 2222)/1000 = 200 l/min (approx).

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### How to determine the displacement of a pump?

To determine the pump displacement you need the RPM and fluid flow rate (in LPM) of the pump.

Displacement (in cc) = (Flow x 1000)/RPM

If flow = 200 LPM & RPM = 2222 then,
Displacement of pump = (200 x 1000)/2222 = 90 cc/rev.

## Definition

1. Displacement of the pump: The capacity of the pump to deliver or displace the liquid from one place to another in one complete rotation or stroke.

## Abbreviation

• LPM: Liter Per Minute.
• RPM: Rotation Per Minute.
• CC: Centimeter Cube.
• CC/rev: Centimeter Cube per Revolution.
• l/min: Liter per Minute.
• kW: Kilo Watt.

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