WATER QUALITY ANALYSIS AND ITS RELATION TO THE SCALING AND CORROSION TENDENCY IN AN OPEN WATER COOLING

The problem of scaling and corrosion are common phenomena in a water cooling system especially the open cooling system. This study was carried out in Temenggor dam with an objective to check the water quality at the intake and tailrace of the hydro power plant. In-situ measurement and laboratory analysis on the water samples were carried out. Seven parameters were measured in-situ i.e. temperature, pH, specific conductivity, dissolved oxygen (DO), total dissolved solid (TDS), turbidity, and chlorine concentration. The water samples were collected using water sampler at three locations near the intake area at surface, and at the interval of one meter up to three meter depth. Two locations at the tailrace also were collected in the same pattern. These samples were brought back to the laboratory in UiTM, Shah Alam for further analysis. Laboratory analysis includes alkalinity, Ca2+, Mg2+ and Fe2+ concentrations, and total suspended solid (TSS). From the results, the LSI, RSI and PSI were calculated to predict the scaling and corrosion tendency. The index shows strong tendency for corrosion to take place in the cooling system as the related factors supported it