Air Compressor


Air Compressor

Compressors Types -Rotating, Reciprocating, Centrifugal & Screw

Reciprocating Air Compressor

Electric Motor gives Rotating Motion to Crank Shaft.

Other Constructions are similar to that of an IC engine

Connecting Rod converts Rotating Motion of Crank Shaft to Reciprocating Motion of Piston

When Piston Moves down – Air (at atm pr) is sucked into the Cylinder through Inlet Valve

When Piston Moves up – Air is Compressed.

Compressed Air leaves the Cylinder through Outlet Valve

If High Pressure is required – No. of Stages / Cylinders should be Increased (Multi Stage)

Temperature of Air Increases when it is Compressed

Air is Cooled after each Stage (before entering the next stage) using an Inter Cooler

Air is Cooled after the Compressor Outlet (before entering the Air Bottle) using an After Cooler

Safety equipments fitted in an Air Compressor

Relief Valve

Bursting Disc

Fusible Plug

Lub Oil Low Pr Alarm and Trip

Motor Overload Trip

Storage of Compressed Air

Compressed Air is stored in Air Bottles

Equipments / Safety Equipments fitted in an Air Bottle

(i) Relief Valve – It is fitted to prevent the Air Pressure (inside

the Air Bottle) from exceeding the Max Working Pr

It is fitted on top of Air Bottle

(ii) Fusible Plug – If the Relief Valve can be isolated from the Air Bottle then a Fusible Plug is fitted

It is fitted on top of the Air Bottle

In the event of fire it discharges the contents to outside of the ER

(iii) Drain Cocks – It is used to drain the Air Bottles (frequently) to prevent accumulation of oil /water

They are fitted at the bottom of Air Bottles

(iv) Pressure Gauge – It is fitted to indicate the pressure of the of the Air inside the Air Bottle

It is fitted at the viewing height