FAM Set-up and Connection
FAM 15/30/50/70 ATEX
en(us)
Page 37 / 96
BeWa FAM15-70 Atex 3193049h en(us) 2013-06-19
2013-06-19
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.
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.
Avoid constrictions in connecting pipelines because they reduce output and
increase the risk of cavitation.
The nominal size of the connected hoses/piping must be at least as large as
the inlet port sizes in order to prevent an excessively high negative suction
pressure.