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Water quality requirements
Ele. conductivity at 25 ºC
General requirements
pH value at 25 ºC
Oxygen (O
)
2
alkaline earths (Ca + Mg)
Phosphate (PO
)
4
When using oxygen
binders:
Sodium sulphite
*5
(Na
SO
)
2
3
*1
If the regulations of the Drinking Water Order/Drinking Water Treatment Order are to
be maintained, then the pH value 9.5 and the PO
not be exceeded.
*2
Generally, much lower values result from continuous operation.
*3
If suitable non-organic corrosion inhibitors are used, the oxygen concentration in the
re-circulated water may increase up to 0.1 mg/litre.
*4
For heating water generators with smoke tube heat exchangers, e.g. flame
tube/smoke tube boilers, half the stated maximum level of phosphate concentration
of 2.5 or 5 mg/litre PO
*5
Other suitable products may also be used. Please observe the respective guidelines
issued by the relevant supplier.
Conversion: 1 mol/m
The VdTÜV datasheet 1466 advises
that other oxygen binders are
offered as chemical additives, which
may contain the following active
agents:
H Ascorbic acid
H Carbohydracide
H Diethyl-hydroxylamine (DEHA)
H Hydroquinone
H Methyl ethyl ketone (MEk)
H Tannins
mS/cm
mg/litre
mmol/litre
*1
mg/litre
mg/litre
must be maintained as lower limit.
4
3
= 5.6 ºdH; 1 ºdH = 0.1792 mol/m
(cont.)
low salt content
10 to 30
clear, without sediments
*1
9 10
*2
< 0.1
< 0.02
*4
< 5
concentration of 7 mg/litre should
4
3
; 1 mval/kg = 2.8 ºdH
These must be used with care
however, as they can give rise to
oxidation, cleavage and transformation
products under boiler operating
conditions.
Please refer to the above guidelines
for further information.
Appendix
> 30 to 100
> 100 to 1500
*1
9 10.5
*2
< 0.05
< 0.02
< 0.02
*4
< 10
with salt
content
*1
9 10.5
*2, *3
< 0.02
< 15
< 10
27
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