Preface Much time were spent in trouble shooting for industrial water application in various geographical locations and observed, the people are involved in operation, and they need to acknowledge the fundamental of boiler water chemistry & preventive. This can help to shoot out the water base trouble in day-to- day system operation. this text cover the contents of fundamental water chemistry related boiler water operation and simplify to understand the boiler water system operation, identify the problem during the operation and preventive action. I thank to the entire author for their valuable contributions in my professional life and avail me to increase the significance of the book, whose briefs are included attend of chapter. Brajendra K. Singh. Contents 1 BOILER SYSTEM 1.1 Boiler System 1.2 ASME guideline 2. WATER & IMPURITIES 2.1 WATER AS A SOLVENT 2.2 Fresh water & Common impurities 2.3 Surface water and groundwater characteristics 3 BOILER WATER & VARIABLE...