Mounting/installing the unit
Notes on the hydraulic connection
In order to keep the pressure loss as low as possible, use as few threaded
connections as possible.
The pressure loss in a hydraulic line depends upon:
•
flow rate
•
Kinematic viscosity
•
Pipe dimensions
•
fluid density
The pressure loss can be estimated for mineral oils as follows:
Δp ≈ 6.8 * L / d
4
* Q * V * D
Δ
p
= Pressure differential in [bar]
L
= Pipe length [m]
d
= Internal pipe diameter [mm]
Q
= Flow rate [l/min]
V
= Kinematic viscosity [mm²/s]
D
= Density [kg/dm³]
Mineral oil has a density of
≈
0.9 kg/dm³.
This applies to straight pipe runs and hydraulic oils. Additional threaded
connections and pipe bends increase the pressure differential.
Keep the height difference between the pump and the fluid level as low as
possible.
Hoses must be suitable for suction pressures of at least -0.5 bar.
Constrictions in the connections and lines should be avoided. This could
compromise suction output and cause cavitation .
Take note that the nominal size of the connected hoses/piping must be at least
as large as the inlet port sizes.
Make sure that no tension or vibrations are carried over to the pump or filter
housing when the pipes are connected. Use hoses or expansion joints if
necessary.
OLFP-6 /X-G/-T001
en(us)
Page 26 / 48
MoWa OLFP-6-x-G-T001 4113643 en-us 2016-04-11.docx
2016-04-11
Summary of Contents for OLFP-6 /X-G/-T001
Page 46: ...Notes ...
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