In special cases, the Commandant of the Coast Guard may permit cargo piping to pass through machinery spaces. This is permitted provided that the only cargo carried through such piping is(are) which of the following?

Correct Answer: Option C — grade E

Under 46 CFR, cargo piping is generally prohibited in machinery spaces to prevent fire hazards. However, the Commandant may grant exceptions for Grade E fuel oils, which have a high flash point and lower volatility, significantly reducing the risk of ignition compared to more flammable cargo grades.