Hydac FluidAqua Mobil FAM 25, Operating And Maintenance Instructions Manual

Page: 42 / 160

FAM Set-up and Connection
FAM 25/45/60/75/95
en(us)
Page 42/160
BEWA FAM25-95 3402054f en(us) 2013-06-13 2013-06-13
The pressure differential in a hydraulic line (

P
(line)
) depends on the following:

Flow rate

Kinematic viscosity

Pipe dimensions

fluid density
The pressure loss in straight pipes (

P
(line)
) can be calculated as follows:
∆ p ~ 6,8 * L / d
4
* Q * V * D
∆
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-based hydraulic fluid has a density
of
~
0.9 kg/dm³.
The density (D) for the following is:
Mineral hydraulic oil HLP 0.85 … 0.90 kg / dm³
Phosphate ester HFDR 1.00 … 1.10 kg / dm³
Insulating oil 0.90 … 1.00 kg / dm³
Lubrication oil 0.90 … 0.95 kg / dm³
Additional threaded connections and pipe bends increase the pressure differential
and must be taken into account.
Keep the height difference between the pump and the oil level in the tank as small
as possible.
Avoid constrictions in the connected hoses. They compromise output and increase
the risk of cavitation.
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.