VMAC – Vehicle Mounted Air Compressors
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39
Temperate Climate Not Critical. Size as per Table 10
GPM during pump
start-up and warm-up
Return line size
(AW 22oil)
Return line size
(AW 32 oil)
8 GPM 3/4” 3/4”
12 GPM 3/4” 3/4” up to 11ft
1” above 11ft
Cold Climate
16-20 GPM 1” 1”
No Tank Preheat –
Line sizing here is
based on strict
adherence to Note 1
of Table 1
Not critical. Size as per Table 3.
GPM during
pump startup and
warm-up
Return line size
8 GPM 1” up to 3 ft
1-1/4” up to 8 ft
1-1/2” above 8 ft
12 GPM 1” up to 2 ft
1-1/4” up to 5 ft
1-1/2” up to 12 ft
1-3/4” above 12
ft
16 GPM 1-1/4” up to 4 ft
1-1/2” up to 9 ft
1-3/4” above 9 ft
Extreme Cold
Climate
With Tank and
Suction line preheat.
(AW32 oil)
Return line not
preheated.
20 GPM 1-1/4” up to 3 ft
1-1/2” up to 7 ft
1-3/4” above 7 ft
Table 12 – Temperature modification
Example of Return Line Sizing:
inputs
startup/warm-up flow 14 GPM
maximum flow 14 GPM
climate type extreme cold
oil type AW32 with tank and suction line
preheat
line length 3 ft
hose size selection
from Table 10 line size 3/4”
from Table 11 need to upsize to 1-1/4”
conclusion
use 1-1/4” return line
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