Question 94Steam Plants - QMED

The correct answer is D) provides a space for moisture to separate from the steam. The steam drum in a D-type marine boiler acts as a collection point for the steam-water mixture generated in the boiler tubes. As the steam-water mixture enters the steam drum, the steam separates from the water, allowing the moisture to settle back down into the boiler, while the dry steam continues on to the superheater or turbine. This separation of the steam and water in the steam drum is a crucial function that ensures the quality of the steam produced by the boiler. The other answer choices are incorrect because they do not accurately describe the primary purpose of the steam drum in a D-type marine boiler. The steam drum does not maintain circulation by forcing steam bubbles downward, act as a receptacle for heavy solids, or support the superheater tube bank.