Approximate calculation of air consumption for a starting operation Duration of starting procedure: 3 sec. Starter pinion speed: 1500 rpm, at ignition speed of motor Operating pressure at starter p : 6 bar e 3 Air consumption of starter at 1500 rpm and p 6 bar: 14 m /min, (diagram) e 3 Air consumption per start: 14 *3 ΔV = = 0,7 m 60 *Since a constant speed of 1500 rpm over 3 sec. was expected, savings in compressed air for the run-up phase from 0 to 1500 rpm is not taken into consideration. Approximate determination of size of air reservoir Number of starting procedures: 3 Pressure in reservoir (assumed): 30 bar Usable pressure drop: 24 bar 3 Total air consumption: 2.1 Nm 3 Size of air reservoir: 0.088 m PS 32/20 Characteristic curves, calculation of air consumption 7 #DriveLineHarmony www.jbj.co.uk/pneumatic-starters.html Pneumatic Starters PS 32/20 Pneumatic Starter
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