What is the primary function of fittings on the steam drum?

The primary function of fittings on the steam drum is to dry and separate steam. In a steam generation system, the steam drum serves as a crucial component where steam and water separate. As water is heated in the boiler, it turns into vapor. The fittings facilitate this separation process by allowing steam to rise while any remaining water can drain back into the system. This ensures that the steam exiting the drum is of high quality, free from excess moisture, which is important for efficient operations and protecting the downstream equipment from damage.

The other functions mentioned in the incorrect options—such as increasing pressure in the boiler or controlling water flow—are more related to the overall boiler operation but do not specifically pertain to the primary role of the steam drum's fittings. Monitoring temperature is also an important aspect of boiler operations but not specifically tied to the drying and separation function of the steam drum fittings.