What is a primary function of a deaerator in a boiler system?

Study for the Massachusetts 3rd Class Engineer Exam. Access flashcards and multiple choice questions with hints and explanations. Prepare for success on your exam!

A primary function of a deaerator in a boiler system is to remove dissolved gases from feedwater. This is crucial because dissolved gases, particularly oxygen and carbon dioxide, can lead to corrosion and scale formation in boiler systems. The presence of oxygen in the feedwater can cause pitting and rusting on metal surfaces, while carbon dioxide can contribute to acidic environments that further promote corrosive conditions.

Deaerators operate by using heat and often low pressure to drive off these unwanted gases, thereby purifying the water before it enters the boiler. This not only protects the integrity of the boiler system but also enhances its overall efficiency and longevity. By ensuring the feedwater is free from corrosive gases, the deaerator plays a vital role in maintaining boiler performance and reducing maintenance costs.

The other options, while related to the boiler system, do not capture the primary role of a deaerator. For instance, while deaerators do heat the feedwater, that is not their main function. Increasing system pressure and measuring water purity are important in boiler operation but do not directly connect to the specific role of a deaerator.

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