34. When a propulsion boiler is removed from service for an extended period, why should the firesides be thoroughly dried after water washing?

Thoroughly drying a propulsion boiler's firesides after water washing is essential before extended periods out of service to prevent corrosion of tubes, drums, and furnace surfaces. Residual moisture, soot, and combustion deposits create corrosive solutions on bare metal surfaces, and the absence of regular heating during lay-up exacerbates this risk. Drying eliminates this moisture, minimizing corrosion and preserving boiler components.