ESWS Engineering Practice Test 2026 – Complete Exam Preparation

The use of hydrazine and morpholine in boiler water treatment is essential for preventing corrosion and optimizing the performance of the boiler system. Hydrazine acts as an oxygen scavenger, helping to remove dissolved oxygen from the water, which is a major contributor to corrosion within the boiler system. By eliminating oxygen, hydrazine effectively protects the metal surfaces of the boiler.

Morpholine, on the other hand, is a pH neutralizing amine that helps maintain the alkalinity of the boiler water. It raises the pH level, counteracting acidity that could lead to corrosion and scaling. Together, hydrazine and morpholine create an effective treatment regimen that ensures the integrity of the boiler system while maintaining efficiency.

The other options do not serve the same purposes in boiler water treatment. While chlorine and sodium are used for disinfection, they do not address the specific corrosion and alkalinity issues in boiler systems. Calcium and magnesium are more commonly associated with hardness and scaling problems, not as treatment chemicals for preventing corrosion. Fluoride and iodine are used in other applications but are not standard in boiler water treatment practices.