46 CFR §111.105-29

1. (a)Each vessel that carries combustible liquid cargo with a closed-cup flashpoint of 60 degrees C (140 degrees F) or higher must have:
   1. (1)Only intrinsically safe electric systems in cargo tanks; and
   2. (2)No storage battery in any cargo handling room.
2. (b)If a submerged cargo pump motor is in a cargo tank, it must meet the requirements of § 111.105-31(d).
3. (c)Where the cargo is heated to within 15 °C of its flashpoint, the cargo pumproom must meet the requirements of § 111.105-31(f) and the weather locations must meet § 111.105-31(l).