We are submitting hereunder an interesting comparison between pneumatic shot blasting process for your study. The comparison clearly establishes the technical superiority of airless shot blasting process and confirms that it is the most economical process.

1. Centrifugal shot blasting process is also known as the airless shot blasting process / wheelabrator process and is highly energy efficient cleaning process and specially recommended for the high volume blast cleaning application. This process is highly economical and gives the lowest cost if compared with the pneumatic shot blasting process.

2. The shot blasting cleaning rate is the proportional to the flow rate of shots thrown by throwing device like nozzle in case of pneumatic shot blasting process and centrifugal wheel in case of centrifugal shot blasting process.

3. By 20 HP of air compressor, the pneumatic shot blasting process propels 300 kg. Per hour steel shots while centrifugal blast wheel with 20 HP can propels 10500 Kg. Of steel shots per hour. As such, the process is power efficient. In view of this, we find that the centrifugal shot blasting process is 30 times more power efficient than pneumatic shot blasting process.

4. The Nozzle size 9/16" dia of pneumatic shot blasting process operating by 80 HP compressor gives a profile of blast pattern of 5" dia only whereas the blast pattern achieved for centrifugal blast wheel is 40" long X 4" wide as depicted in the figure is achieved by the 20 HP blast wheel motor. This shows a much bigger and uniform pattern (160 sq. inch by airless shot blasting machine and 20 sq. inch by a pneumatic shot blasting machine) is available by airless shot blasting machines. Thus airless shot blasting machine is better to deliver consistent blasting result than pneumatic shot blasting machine. Pneumatic shot blasting machines are better for low production rates and for the internal blast cleaning of pipes and intricate components.

5. It is general false feeling that the maintenance of centrifugal shot blasting machines is on higher side in comparison to pneumatic shot blasting machines. This is misconception. Normally we use to compare the maintenance cost of propelling 300 kg. Per hour of shots by pneumatic shot blasting process to 10500 kg. Per hour of shots by centrifugal shot blasting process which is not correct. We should compare what will be maintenance cost of pneumatic shot blasting process for propelling 10500 kg. Per hour of shots.

6. In pneumatic shot blasting process 300 kg. Of shots are propelled per hour while in centrifugal shot blasting process 10500 kg. of shots are propelled resulting into lower cost and better finish.