Bosch Air tools for industry catalog Page 111
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Air technology guide | 111 Pipe dimensioning Rough calculation Calculations using exact equations are very complex; If additional machines need to be connected to this besides, individual factors are difficult or even impos- pipe, their air consumption must be taken into ac- sible to acquire. To nevertheless give you something count in the calculation. to go by, the diagram (Fig. 5) for determining the pipe An existing system can be checked in the same way. inner diameter can be used to perform a short rough Unlike calculation of the pipe cross-sections, the calculation. compressor size is determined by the input factor. Example: the sum of the air consumption values of 6 The input factor expresses the actual running time of machines results in 36 l/s (76.3 cfm). Fig. 3 provides the tool as a percentage. For systems that mainly have a demand factor of 0.79 for 6 machines; this results screwdrivers connected to them, this factor is in the in 36 x 0.79 = 28.5 l/s (60.4 cfm). With this value, you range of approx. 5 to 15%; whereas for systems with can calculate the dimensions of the pipe by using the grinders operated in continuous use (e.g. fettling diagram (Fig. 5). Based on the air quantity of approx. shops), a value of 30 to 70% has to be expected. To 28.5 l/s (60.4 cfm) decompressed air, this results in determine the required compressor size as accurately a pipe inner diameter of at least 1". A theoretical pipe as possible, it is however best to check the circum- length of 130 m (actual length 100 m + 30% allowance stances on-site and then determine the input factor, or for pressure loss at fittings, elbows, etc.) results in a consult a compressor manufacturer. pipe inner diameter of 1.5". Pipe length (m) Air quantity (l/s) Decompressed air 5 10 1/2" (13 mm) 6.5 8 20 30 3/4" (19 mm) 40 50 75 100 150 200 250 300 350 400 1" (25 mm) 12.5 16.5 25 1 1/4" (32 mm) 1 1/2" (38 mm) 33 41.5 50 58 2" (50 mm) 2 1/2" (65 mm) 66.5 75 83 100 110.5 133 Fig. 5 Pipe dimensioning 3" (80 mm) 450 500
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