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pH
Total hardness (as CaCO
Total alkalinity (as CaCO
Total dissolved solids
Conductivity
Chlorides
Sulfates*
Total suspended solids
Chlorination (as free chlorine / halogen): continuous
Chlorination (as free chlorine / halogen): batch dosing for cleaning &
disinfection
*Note: Higher concentration of sulfates is allowed, provided the sum of chlorides + sulfates parameters does not exceed 650 mg/l for
Baltibond/SST304L.
*Note: In case of a HDG coil, passivation of the coil is required. During this period, both the pH and the hardness of the spray water will have
more stringent requirements. The pH must be kept between 7 and 8.2, and the hardness must be kept between 100 and 300 ppm.
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.
Biological control
The growth of algae, slimes and other micro-organisms, if uncontrolled, will reduce system efficiency and may
contribute to the growth of potentially harmful micro-organisms, such as Legionella, in the recirculating water
system.
Accordingly a treatment programme specifically designed to address biological control should be initiated when
the system is first filled with water and administered on a regular base thereafter in accordance with any
regulations (national, regional) that may exist or in accordance with accepted codes of good practice, such as
EUROVENT 9-5/6, VDMA Detailsheet 24649 etc.
It is strongly recommended to monitor the bacteriological contamination of the recirculating water on a regular
base (for example, TAB test with dip slides on a weekly base) and record all results.
8
W W W . B A L T I M O R E A I R C O I L . E U
)
3
)
3
Circulated water quality guidelines for Baltibond
®
Baltibond
Hybrid Coating and SST304L
6.5 to 9.2
50 to 750 mg/l
600 mg/l max.
2050 mg/l max.
3300 µS/cm
300 mg/l max.
350 mg/l max.*
25 mg/l max.
1.5 mg/l 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.
®
Hybrid Coating
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