Hydac FAM 5 FluidAqua Mobil, Инструкция по эксплуатации и техническому обслуживанию

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Unit setup and connection
FAM 5
en-US
Page 39 / 148
BEWA FAM5 4166129a en-us 2019-03-04.docx 2019-03-04
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Fluid density
The pressure loss in straight pipes (
∆
P
(line)
) can be calculated as follows:
Δp ≈ 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 = Kinematic viscosity [mm²/s]
D = Density [kg/dm³] Mineral oil-based hydraulic oil 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
Insulation oil 0.90 … 1.00 kg / dm³
Lubricating oil 0.90 … 0.95 kg / dm³
Find the flow rate in chapter "Technical data" on page 139.
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.