🔍 Key Concepts

• Boiler priming and what carries over with the water during priming • Function and location of an integral superheater in a propulsion boiler • How moisture or water droplets in steam affect turbine blades and casings

💭 Think About

• When priming occurs, what exactly is being carried into the steam lines, and how does this differ from normal dry saturated steam? • Think about which components (superheater or turbine) are directly exposed to the steam flow, and how liquid water in that steam might affect them mechanically and thermally. • Would damage from wet steam be limited to one part of the system, or could it extend further downstream? Why?

✅ Before You Answer

• Be clear on the definition of priming (water carryover vs. just pressure fluctuation). • Visualize the steam path: drum → superheater → main steam turbine. Which parts see the steam first, and in what condition? • Consider how erosion, thermal shock, or overheating could occur if water droplets are present where only dry steam is expected.