CSM 2000 Series
Hydraulic Connection of the CSM
HYDAC FILTER SYSTEMS GMBH
en(us)
Page 21 / 40
BeWa CSM2000 3211683h en-us 2011-12-01.doc
2011-12-01
Notes on piping / hosing
Use as few threaded connections as possible in order to keep the pressure loss as
low 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 hydraulic oils as follows:
Δ
p ~ 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
= kinematics viscosity [mm²/s]
D
= Density [kg/dm³]
Mineral oil-based hydraulic fluid 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 oil level in the tank as
minimal 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.
