What is a common result of not properly treating boiler feedwater?

Not properly treating boiler feedwater typically leads to scale buildup and corrosion within the boiler system. This occurs because untreated feedwater can contain impurities such as minerals, salts, and other contaminants. When water is heated to produce steam, these impurities can precipitate out and form mineral deposits, commonly known as scale. Scale can significantly reduce the heat transfer efficiency of the boiler, leading to increased fuel consumption and operational costs.

Corrosion, on the other hand, can be initiated by oxygen, carbon dioxide, and other corrosive elements present in untreated water. These elements can cause serious deterioration of the boiler components, leading to leaks and, in extreme cases, catastrophic failures. The presence of corrosion and scale not only compromises the integrity and efficiency of the boiler but also requires more frequent maintenance and repairs, ultimately increasing operating costs and downtime.

In contrast, the other options suggest outcomes that would typically be achieved through proper treatment of boiler feedwater. For instance, improved steam quality and increased energy efficiency are benefits of maintaining clean and treated feedwater, as is the reduction of maintenance costs due to fewer issues related to scaling and corrosion. Thus, the answer highlighting scale buildup and corrosion accurately represents the consequences of inadequate feedwater treatment.