New York Low Pressure Boiler COF Practice

In the context of a Deaerator, the purpose of adding certain chemicals to the water is to improve the water quality, particularly by reducing corrosion and scaling within the boiler system. Di phosphate is used specifically for this purpose because it helps to prevent the formation of scale and stabilizes pH levels, ultimately enhancing the overall quality of the water being used in the boiler.

Di phosphate works as a sequestering agent, effectively binding with various dissolved minerals and preventing them from precipitating out of the water, which can form unwanted scale inside the boiler. This is critical in maintaining boiler efficiency and longevity, as scale build-up can lead to reduced heat transfer and overheating.

The other options, although sometimes used in water treatment, do not specifically target the improvement of water quality in the same effective manner as Di phosphate in the context of a Deaerator setup. For instance, trisodium phosphate is used for alkalinity control and as a cleaning agent, while sodium bicarbonate might be used to adjust pH but does not have the specific scale prevention capabilities of Di phosphate. Calcium chloride can add hardness to the water, which is counterproductive in a boiler system since it can promote scale formation. Thus, Di phosphate stands out as the most suitable additive