3.2 Disadvantages:
1- Preparation: Compressed air requires good preparation. Dirt and
condensates should be removed.
2- Speed: As air is compressible; it is difficult to achieve uniform and
constant piston speed.
3- Force requirement: Compressed air is economical only up to a certain
force requirement. Under the normal working pressure of 600 to 700 kPa
(6 to 7 bar).
4- Noise level: The exhaust air is loud (noise). This problem has now,
however been largely solved due to the development of sound
absorption material and silencers.