Hydraulic Connection of the CSM
CSM 1000 Series
en
23 / 48
MoWa CSM1000 3512624c en-us 2012-11-26.doc
2012-11-23
Notes on piping / hosing
In order to keep the pressure differential 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 differential 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.