Commissioning
HYDAC Filtertechnik GmbH
en
Page 45
BEWA OLF15-60 10bar 3255361-01a en.doc
2005-11-22
9
Suction Port Connection
The suction port may be connected to a flexible hi-collapse hose, or to hard piping. If the
OLF is connected to hard piping, precautions must be taken to ensure that no stresses or
vibrations are transmitted to the pump/filter housing. Dampeners may have to be installed.
Constrictions in the connections and lines should be avoided in order to prevent
compromising suction output (
⇒
danger of cavitation).
The nominal size of the connected hoses/piping must be at least as large as
the inlet/outlet port sizes of the pump.
If large contaminant particles are present (
>
100 µm), e.g. weld spatter, an
appropriate strainer must be installed in the suction line to protect the pump.
If the unit is installed below the fluid level of the reservoir, a shut-off must be
installed in order to allow filter element replacement. If a unit without a
pump/motor group is used, it is important to ensure that no pressure
pulsation is transmitted to the unit.
10
Pressure Port Connection
The nominal size of the pressure hose should be equal to that of the filter housing port
whenever possible. If a smaller hose size is used, the pressure drop must nevertheless be
less than 2 bar (29 psi) with a clean filter element
Make sure that no vibrations or stress/loading from other machinery and equipment are
carried over to the pump or filter housing. Use hoses and expansion joints as may be
necessary.
Make sure to also install the return-flow line or return-flow hose below the oil level in order to
prevent air from entering the fluid.
For back pressures of >1 bar (14.5 psi), a differential clogging indicator
should be installed.
