Why is it important to monitor total dissolved solids (TDS) in a boiler system?

Monitoring total dissolved solids (TDS) in a boiler system is crucial primarily to prevent scaling and corrosion within the boiler. TDS refers to the total concentration of dissolved substances in water, which can include minerals, salts, and metals. When water with high TDS levels is used in a boiler, the dissolved solids can precipitate out as the water heats up, leading to the formation of scale. Scale buildup can insulate heat transfer surfaces, resulting in inefficient heat transfer, operating inefficiencies, and ultimately potentially damaging the boiler.

Additionally, high TDS can contribute to corrosive conditions within the boiler. Elements such as chloride and sulfate, often part of the total dissolved solids, can aggressively attack metal surfaces, leading to pitting and other forms of corrosion. Regular monitoring of TDS allows for timely treatment of feedwater and blowdown processes to maintain optimal water quality, thereby extending the lifespan of boiler components and ensuring safe, efficient operation.

While monitoring TDS might have indirect implications for water temperature, fuel efficiency, and water usage, its primary importance lies in maintaining the integrity and efficiency of the boiler system by mitigating the risks associated with scaling and corrosion.