Storage; Noise Level; Filtration - Danfoss APP 1.0 Installation, Operation And Maintenance Manual

Data sheet
8.

Noise level

9.

Filtration

8
APP 0.6-1.0

7.2 Storage

Storage temperature:
-40°C to +70°C (+40°F to 158°F) – provided that
the pump is drained of fluid and stored
"plugged"
The table indicates the approximate noise level
in dB(A) measured at a distance of 1 m from the
Type
APP 0.6
APP 0.8
APP 1.0
Generally, noise will be reduced if speed is
reduced and vice versa. Use flexible hoses in
order to minimize vibrations and noise.
Since the pump is typically mounted on a bell
housing or frame, the noise level must be
determined for the complete unit (system).
It is therefore very important that the motor/
pump unit is mounted correctly on a frame with
antivibration isolation to minimize
As water has very low viscosity, the APP pumps
have been designed with very narrow clearance
in order to control internal leakage rates and
improve component performance. Therefore it is
important that the inlet water is filtered properly
to minimize the wear of the pump.
The main filter must have a filtration efficiency of
99.98% at 10 µm. We recommend to use
precision depth filter cartridges rated 10µm abs.
ß10>5000 (equivalent to a filtration efficiency of
99.98%). Bag filters and string wound filter
cartridges typically have only 50% filtration
efficiency.
180R9262 / IOM APP 0.6-1.0 Appendices - v02 / 12.2012
Frost protection is required at temperatures
below 2°C. Danfoss recommends to use
DOWFROST from DOW Chemical Company or
Chilsafe mono propylene glycol from Arco
Chemical Company.
pump in a reverberation room:
60 bar (870 psi)
1500 rpm
70
73
73
vibrations and noise.
The noise level is influenced by:
The speed of the pump, high rpm create
more noise than low rpm
Rigid mounting of the pump generates
more noise than flexible mounting
Pipe mounting direct to the pump
increases the noise level compared to a
flexible hose
This means that for each 100,000 particles
reaching the filter, 50,000 particles pass through
it compared to only 20 particles in a filter with an
efficiency of 99.98%.
For more information on the importance of
proper filtration, please consult our publication
"Filtration" (code number 521B1009), which also
will provide you with an explanation of filtration
definitions and a guidance on how to select the
right filter.
60 bar (870 psi)
3000 rpm
73
75
75