What effect does disodium phosphate (DSP) have on the boiler water?

Disodium phosphate (DSP) plays a crucial role in maintaining the quality of boiler water. When added to the boiler water, DSP increases the levels of phosphate, which helps to control the formation of scale and deposits on the boiler surfaces. This is important because phosphate combines with calcium and magnesium in the water to form insoluble compounds, thereby preventing these minerals from contributing to scale buildup. Additionally, disodium phosphate contributes to increasing the conductivity of boiler water. High conductivity is generally desirable as it indicates a higher concentration of dissolved solids, which can be necessary for proper operation of the steam system.

In contrast, other options either neglect or misrepresent the specific effects of DSP. While maintaining proper pH is necessary for operational effectiveness, the primary effect of DSP is related to phosphate levels and conductivity adjustments rather than direct pH neutralization or corrosion reduction. Therefore, the understanding that DSP increases both phosphate levels and the conductivity of the boiler water underscores its significance in maintaining efficient boiler operation and overall system reliability.