Which of the following is a common cause of boiler corrosion?

The presence of oxygen in the feed water is indeed a common cause of boiler corrosion. When oxygen is dissolved in water, it can react with the metal surfaces within the boiler. This reaction leads to the formation of rust and other corrosion products, which can significantly weaken the integrity of the boiler and affect its operational efficiency. Oxygen acts as an oxidizing agent, and even in small quantities, it can initiate corrosion processes, particularly in high-temperature environments typical of boiler systems.

In contrast, high temperatures can actually accelerate corrosion processes but are not a direct cause. Similarly, the presence of oil may lead to operational issues but does not directly contribute to corrosion in the same way oxygen does. Regular maintenance is essential in preventing and mitigating corrosion but is not a cause; instead, it serves to address problems like corrosion before they lead to significant damage. Therefore, the presence of oxygen in the feed water is rightly identified as a primary contributor to boiler corrosion.