Which method is primarily used to correct excessive dissolved solids in a boiler?

• A. Chemical treatment
• B. Filtration
• C. Blowdown
• D. Cooling

Answer: (C)

The primary method used to correct excessive dissolved solids in a boiler system is blowdown. This process involves the intentional removal of a portion of water from the boiler, which helps in reducing the concentration of dissolved solids. As water is evaporated in the boiler to produce steam, it leaves behind these solids, leading to an accumulation over time. If left unchecked, high levels of dissolved solids can cause various problems, such as scaling, foaming, and carryover, which can significantly impact boiler efficiency and safety.

Blowdown serves to manage and maintain the total dissolved solids (TDS) within acceptable levels by regularly discharging a small volume of water, thereby diluting and removing the concentrated impurities. This ensures that the boiler operates efficiently and prolongs its operational lifespan.