In the following tables, hydraulic flow can be below
minimum specifications. These flow ratings are for
startup only, not for operation of the PREDATAIR. Refer
to Section 2.3 Hydraulic Requirements for flow
specifications.
!
6.2.1 Suction Line Sizing
!
Failure to select the correct suction line size can result
in pump cavitation and premature pump failure.
Choose a suction hose size from Table 7 (based on 4 ft/sec fluid
velocity), then upsize the hose, if necessary, using Table 8, 9 or 10.
When consulting these tables, locate line sizes that will provide
sufficient oil flow to the pump during startup with cold oil. The system
should be designed to run at the lowest GPM possible at startup,
then use a throttle control to increase GPM for operations once the
oil has warmed.
Space and port size issues at the pump may require a short length of
smaller than desired hose. Keep this as short and as large (ID) as
possible to limit effect on performance and pump life.
Maximum Operating GPM
Suction Hose Size
8-13 1”
14-15 1-1/4”
16-22 1-1/2”
Table 7 – Suction hose size
With tank and Suction Preheat
system.
Preheat to –20
°
C or warmer prior to
pump startup. Suction hose sizing same
as “Cold Climate” with AW 32 oil.
No tank preheat. Line sizing here
is based on strict adherence to
Note 1 in Table 1.
Suction hose sizing same as “Cold
Climate” with AW 22 oil.
Table 8 – Extreme Cold Climate
VMAC – Vehicle Mounted Air Compressors
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