How are Deposits and Corrosion Prevented in Feed-water Systems?
Deposits in feed-water systems are most frequently caused by hardness coming out of solution as the water goes through feed- water heaters or as the feedlines enter the boiler. Deposits also can occur from premature reaction of treatment chemicals with hardness in the feed-water. Prevention involves the use of stabi-lizing chemicals fed continously to retard hardenss precipita-tion. Proper design of the chemical feed system can minimize premature chmical reactions. Corrosion of feed-water system generally results from low alkalinity or dissolved oxygen in the water. Raising the pH of the water and the continous feed of catalyzed sodium sulphate will minimize this problem.
