Difference Between Hydraulic System and Pneumatic System

The basic difference between hydraulic and pneumatic system is that in hydraulic system the input mechanical energy is imparted to the oil by using motor or pump, whereas, in the pneumatic systems as the working fluid is air, the mechanical energy is imparted to the air by the compressor.
A hydraulic system usually operated at very higher pressures that transmits very high power while the pneumatic system operates at low pressures near about 5-8 bar for industrial applications.

Sr. No.

Hydraulic System

Pneumatic System

1. It is robust in construction. It is simple in construction
2. To protect against rust, dust and corrosion, the system needs special attention. This system does not require any special attention.
3. Hydraulic oil is not able to transport easily. Air is easily transported as the density of the air is lower than hydraulic oil.
4. Power to size ratio is more. Power to size ratio is small.
5. Weight of this system is high. Weight of this system is less as compared to hydraulic system.
6. Leakage problems affect the operation of the system. Leakage problems does not affect the operation of the system.
7. Hydraulic oil is flammable. Air is inflammable.
8. Contamination control is required in this system. Contamination control is not required in this system.
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Sujit Kadus

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