**Last updated:** November 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).

### 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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