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5.962-786.0 Rev. 05 (06/13)
The upper limited is given if material damage occurs
during cleaning. Therefore, the impact pressure is
determined by the type of surface to be cleaned.
Examples for maximum impact pressure (experience
values):
The water serves as a carrier for
Pressure (kinetic energy)
Temperature (heat energy)
Detergent
The water volume also determines the transport of
the loosened dirt.
Large water volumes generate a high impact pres-
sure. This is due to the fact that the jet opens up less
at larger distances with large water volumes than it
does with smaller water volumes. Here is an exam-
ple:
If the water volume is increased by 60% from 750 l/h
to 1,200 l/h with a nozzle pressure of about 80 bar,
the impact pressure is increased by almost 100% as
a result of the lesser atomization.
Minimum:
approx. 700 l/h; with smaller values, the
jet will open too much even with low pump pressure,
so that the impact pressure remains too small to rap-
idly break up dirt. Besides, the loosened dirt cannot
be transported because of the low water volume, as
the washing effect of the water volume is too weak.
Maximum:
approx. 3,000 l/h; with larger water vol-
umes, the repulsion power becomes so great that the
operator will tire easily. In addition, there will be prob-
lems with the water and energy supply. Often, the
sewer system is too small for these water volumes,
so that larger water volumes cannot drain. When op-
erating the system with a spray head, however, water
volumes of more than 3,000 l/h are normal.
A Flow volume (l/h)
B Nozzle pressure (bar)
C Nozzle size
1.1.3
Limits of the impact pressure
Stable cleaning
0,06... 1 MPa (0.6... 10 bar)
Washing the vehi-
cle
0,04... 0.1 MPa (0.4... 1 bar)
Food operations
0,01... 0.06 MPa (0.1... 0.6
bar)
1.1.4
Influence of the water volume
1.1.5
Limits of the water volume