S
-108-
COMMON
Water info
Because of continuous examinations of systems for water treatment we would like to
offer you a few information on some different systems.
The given statements are only related to Rational units.
If you already have made experiences with systems for water treatment, we would be
very thankful if you could send us a short fax about your experiences.
1. Recommended systems for water treatment:
A)With pure scale problems in the steam generator we recommend hydrogen-(H+)-
Ionic exchanger. These type of fi lters will extend the intervals of descaling to
approx. 5 to 8-times of the normal descaling intervals. But even with this type of
fi lters it is still necessary to descale the steam generator.
B) With a high chloride – content above 150mg/l of water, it is possible, that the
interior cabinet starts to corrode. To remedy this problem it is necessary to install a
reverse - osmosis – fi lter.
C) With chlorine-contents above 0,2 mg/l of water an active carbon fi lter should be in-
stalled, to avoid corrosive radicals when chlorine is heated up.
D)If the water is soiled with sand, iron particles or suspended matters a particle fi lter
with 5-15 μm is recommended.
2. Limited recommended systems for water treatment.
A)Phosphate dosing systems
For verifying the function of this system, it is necessary to mix the water with a very
high content of phosphate. Because of this the maximum allowed content of 5 mg
phosphate per litre of water will be exceeded. This means the water has no drinking
water quality any more. Therefore phosphate dosing systems can only be recommen-
ded for avoiding scale in the quenching chamber as it is not necessary to have drinking
water quality for the quenching system.
B)Physical systems for water treatment:
On some sites this type of water treatment (is directly installed in the water supply of
the unit) showed satisfactory results. On other sites there was no positive effect visible
with this type of system. Because of these circumstances we can not make a fi nal
assessment of this system.
3. Not recommended systems for water treatment.
A) Sodium-Ionic exchanger:
With this fi lter system calcium is replaced by sodium. On chlorine contents of the
water above 50mg/l, sodium reacts with chlorine to NaCl (=salt). This increase of salt
in the water results in a delay in boiling of the water. This delay in boiling can cause
”spitting” steam generators.
B)Silicate-dosing systems:
This kind of systems are problematic, as the adding of non conductive silicates, will
infl uence the water level measurement.infl uence the water level measurement.
Rational recommends Water treatment fi lters systems of BRITA company.
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