Multi- stage Compression

 1.   The work done per kg of air is reduced in multistage compression with intercooler as compared to single stage compression for the same delivery pressure. 2.  It improves the volumetric efficiency for the given pressure ratio. 3.  The sizes of the two cylinders (ì.e. high pr.& low pr. ) may be adjusted to suit the volume and pressure of air. 4. It reduces leakage loss considerably. 5. It gives more uniform torque and hence a smaller size flywheel is required. 6. It provides effective lubrication because of lower temperature range. 7.   It reduces the cost of compressor.