VMAC – Vehicle Mounted Air Compressors
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Example of Suction Line Sizing:
inputs
startup/warm-up flow 12 GPM
maximum flow 20 GPM
climate type cold
oil type AW32
tank oil level 4 ft above pump
length of hose run 8 ft
hose size selection
from Table 2, basic suction hose size
• 1-1/2”
from Table 4, “cold climate” 12 GPM, AW32
• 1-1/2” is good up to 4’ + 40% (For 4’ tank level) = 5.6’
• 1-3/4” is good up to 6’ + 40% = 8.4’
conclusion
use 1-3/4” ID suction hose (or larger)
6.2.2 Return Line Sizing
Choose a return line size from Table 11 (based on 10 ft/sec fluid
velocity), then upsize the line, if necessary, using Table 12.
Failure to follow this return line sizing procedure can
lead to failure of the shaft seal on the PREDATAIR60
hydraulic motor during cold startup of the hydraulic
pump.
Maximum GPM Return Line Size
14 3/4”
15-22 1”
Table 11 – Return line size
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