How to monitor and control Corrosion/Scaling in Cooling Water System
Corrosion and scaling in cooling water system can be monitor and control by following methods. 1. Corrosion Coupon 2. ORP (Oxidation Reduction Potential) 3. The Langlier Saturation Index (LSI) and the Ryznar Stability Index (RSI) Corrosion Coupon: It is installed to check the cooling water tendency of corrosion. A weighted metal piece is used in coupons. After definite period the metal strip is taken out, washed and weighted again. The loss in weight indicates the corrosive tendency of water. It is measured in mils per year (mpy). 1 mpy = 0.025mm Corrosion Rate = Weight loss(mg) * 365 * 39.4 / Density of metal (mg/mm3) * Surface Area (mm2)* No of Days Surface Area (A) = 2*[(L*B) + (B*T) + (L*T)] + 3.14 D * T - (3.14 D2 /2 * ) Where, L = Length of the coupon. B = Width of the coupon. T = Thickness of the coupon. D...