You are onboard a tankship during the final stages of loading number two fuel oil. Regulations require that your cargo tanks have installed high level and tank overfill alarms. At what point must the high level alarm activate?

Correct Answer: Option D — At 95% of tank capacity or higher but less that the setting of the overfill alarm

Under 46 CFR Table 30.10-22, petroleum liquids are categorized by flash point. Combustible liquids have a flash point at or above 80°F (27°C). Specifically, Grade D combustible liquids encompass products with a closed-cup flash point between 80°F and 200°F, making an 85°F flash point Grade D.