VMAC – Vehicle Mounted Air Compressors
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6.2.3 Pressure Line Sizing
Choose a pressure line size from Table 13 (based on 20 ft/sec fluid
velocity), then upsize the line, if necessary, using Table 14.
Maximum GPM Pressure Line Size
14-19 5/8”
20-22 3/4”
Table 13
Temperate
Climate
Not Critical. Size as per Table 8
Cold Climate 3/4”
No Tank Preheat. Line
sizing is based on strict
adherence to Note 1 of
Table 5
3/4”
GPM during
pump startup
Pressure Line
size
8 3/4” up to 7ft
1” above 7ft
12 3/4” up to 5ft
1” above 5ft
16 3/4” up to 3.5ft
1” up to 12ft
1-1/4” above 12ft
Extreme
Cold Climate
With Tank and Suction
line preheat. (AW32 oil)
Pressure line not
preheated.
20 3/4” up to 3ft
1” up to 9ft
1-1/4” above 9ft
Table 14
6.3 Hydraulic System Filtration
Use a 10 micron return line hydraulic oil filter; 25 micron is
acceptable. Flow rating of the filter must be equal to or greater than
the maximum GPM at which the system will be operated. Use only a
filter that is specifically intended for hydraulic systems.
6.4 Hydraulic Oil Reservoir
6.4.1 Size
Hydraulic oil reservoirs range in size from about 3 times the total
system GPM on stationary equipment down to 0.1 times the total
system GPM on some mobile hydraulic systems. For a 20 GPM
hydraulic system, this equates to a size range from 2 gallons (14 lbs)
to 60 gallons (430 lbs) of oil.
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