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 D — grade E

Under 46 CFR, cargo piping is generally prohibited from passing through machinery spaces. However, the USCG Commandant may permit piping carrying Grade E combustible liquids through machinery spaces due to their significantly higher flashpoints and lower volatility hazard profile.