If a vessel is to be laid up for an extended period of time with minimal utilities provided from ashore, boilers may be laid up dry. What statement concerning dry boiler lay-up is true as it relates to protecting boiler watersides?

Correct Answer: Option D — The steam and water drums can be opened up to permit air circulation, or as an alternative desiccant can be placed inside the closed-up steam and water drums.

Dry lay-up aims to keep internal surfaces moisture-free. This is achieved either by maintaining air circulation to prevent condensation or by sealing the boiler and using desiccants to absorb humidity. Both methods are recognized by marine engineering standards to prevent corrosion during extended periods of inactivity when the boiler is empty.