Notes On Pipes/Hosing - HYDAC FILTER SYSTEMS MRF4 Installation And Maintenance Instructions Manual

Notes on pipes/hosing

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 hydraulic oils as follows:
= Pressure differential in [bar]
Δ
p
L = Pipe length [m]
d = Internal pipe diameter [mm]
Q = Flow rate [l/min]
V = Kinematic viscosity [mm²/s]
D = Density [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
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.
MRF4
MoWa MRF4 3214670d en-us 2018-02-09.docx
Setting up / fastening / mounting the filter housing
Δp ≈ 6.8 * L / d
Mineral oil-based hydraulic oil has a density
of approx
en(us)
4
* Q * V * D
0.9 kg/cm³.
.
Page 25 / 36
2018-02-09