If a vessel is to be laid up for an extended period of time with minimal utilities provided where freezing is not a concern, boilers may be laid up wet. What statement concerning wet boiler lay-up is true?
• Wet lay-up vs. dry lay-up of boilers and why you choose one over the other • The purpose of deaeration and chemical treatment of boiler water (oxygen control, corrosion prevention) • What it means to completely fill a boiler and the role of the atmospheric vent
• Think about what causes internal corrosion in an idle boiler and how the lay-up procedure is designed to prevent it. • Consider whether it is better to leave any air space inside the boiler during a long wet lay-up, or to remove as much air as possible. • Ask yourself which type of water (ordinary fresh water vs. deaerated and chemically treated water) best protects metal surfaces over a long, idle period.
• Check which choice both removes air space from the boiler and eliminates oxygen-rich water as much as possible. • Verify which option mentions deaerated and chemically treated water and whether that matches standard corrosion-prevention practice. • Confirm which option uses the atmospheric vent as the indication that the boiler is fully filled, not just to the top of the sight glass.
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