If your asphalt barge has operated more than 12 months in saltwater in the 24 month period since it was last dry-docked, when is it required to be hauled out again?

Correct Answer: Option D — 36 months since last dry-docking

Under 46 CFR 31.10-21, tank barges operating in saltwater more than 12 months in any 24-month period must normally be dry-docked every 36 months (3 years). This ensures structural integrity and prevents excessive hull corrosion from prolonged saltwater exposure.