SST304L
SST316L with HDG coil
SST316L
(with SST316L coil)
pH
6.5 to 9.2
6.5 to 9.5
pH during initial passivation
Below 8.2
(for units with HDG coil only)
Not applicable
Total hardness (as CaCO
3
)
50 to 750 mg/l
50 to 750 mg/l
Total alkalinity (as CaCO
3
)
600 mg/l max.
600 mg/l max.
Total dissolved solids
2050 mg/l max.
2500 mg/l max.
Conductivity
3300 µS/cm
4000 µS/cm
Chlorides
300 mg/l max.
750 mg/l max.
Sulfates*
350 mg/l max.*
750 mg/l max.*
Total suspended solids
25 mg/l max.
25 mg/l max.
Chlorination (as free
chlorine/halogen): continuous
1,5 mg/l max.
2 mg/l max.
Chlorination (as free
chlorine/halogen): batch dosing for
cleaning & disinfection
5-15 mg/l max. for 6 hours max.
25 mg/l max. for 2 hours max.
50 mg/l max. for 1 hour max.
5-15 mg/l max. for 6 hours max.
25 mg/l max. for 2 hours max.
50 mg/l max. for 1 hour max.
Circulated water quality guidelines for Stainless Steel
*Note:
Higher concentration of sulphates is allowed provided the sum of chl sulphates parameters does not exceed 650 mg/l for
SST304L and 1500 mg/l for SST316L.
For Ozone water treatment application:
•
Stainless steel 316L execution is required.
•
Ozone levels are to be maintained to 0.2 ppm ± 0.1 ppm for at least 90% of the time, with absolute maximum
peaks of 0.5 ppm
Cycles of concentration are the ratio of the dissolved solids concentration in the circulating water compared to the
dissolved solids concentration in the make-up water. The blow down rate can be calculated as follows:
Blow down = Evaporation loss / (Cycles of concentration – 1)
The evaporation loss is not only function of the heat load but also depends on climatic conditions, the type of
equipment used and the method of capacity control, which is applied. The evaporation loss at summer conditions
is approximately 0.431 l/ 1000 kJ heat rejection. This number should be used for blow down valve sizing only and
not for the calculation of annual water consumption.
W W W . B A L T I M O R E A I R C O I L . E U
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