🔍 Key Concepts

• Difference between saturated steam and superheated steam in a boiler system • Location and purpose of a superheater relative to the steam drum and main gas path • How steam actually gains additional heat after reaching saturation temperature at a given pressure

💭 Think About

• Where in a typical marine boiler does steam pick up heat to become superheated—while mixed with water in the drum, or somewhere else? • Which of the listed actions (firing rate, feedwater flow, separate path, economizer) actually changes the state of the steam from saturated to superheated, rather than just affecting quantity or efficiency? • What physical condition must be true about the steam-water mixture for further temperature increase (at the same pressure) to count as superheating?

✅ Before You Answer

• Identify where saturated steam exists in the boiler (drum vs. superheater tubes) • Confirm that economizers act on feedwater, not on steam itself • Confirm that superheating requires steam to be separated from liquid water so its temperature can rise above saturation at that pressure