Page 344 - Corrosion Engineering Principles and Practice

314 C h a p t e r 8 C o r r o s i o n b y W a t e r 315

Conductivity TDS
(lS/cm) (mg/L as CaCO )
3
1 0.42
10.6 4.2
21.2 8.5
42.4 17.0
63.7 25.5
84.8 34.0
106.0 42.5
127.3 51.0
148.5 59.5
169.6 68.0
190.8 76.5
212.0 85.0
410.0 170.0
610.0 255.0
812.0 340.0
1008.0 425.0

TABLE 8.15 Conversion Table between the Conductivity of Natural Water and
the TDS It Contains

Calculation example. Suppose the drinking water supplied to animals
has the following analysis:
pH = 7.5

TDS = 320 mg/L
Calcium = 150 mg L (or ppm) as CaCO
−1
3
Alkalinity = 34 mg L (or ppm) as CaCO
−1
3
The LSI index is calculated at two temperatures, that is, 25°C (room
temperature) and 82°C (cage wash cycle). The colder incoming water will
warm to room temperature in the manifolds. Residual water in the rack
manifold can be heated to 82°C when the rack is in the cage washer.
LSI formula:

LSI = pH − pH
s
pH = (9.3 + A + B) − (C + D)
s