🔍 Key Concepts

• Cargo compatibility tables in 46 CFR for chemical tankers • Specific reactivity and adjacent tank requirements for propylene oxide • Ideas of "incompatible" vs. "may not be stowed adjacent" and how they are shown in the tables

💭 Think About

• Look up each pair of cargoes (butyric acid/propylene oxide, butyric acid/octyl alcohol, octyl alcohol/propylene oxide) in the compatibility table rather than guessing from general chemistry knowledge. • Ask yourself: does the regulation distinguish between full incompatibility and restrictions on adjacency for any of these pairs? • Check whether any one pair has a stricter restriction than the others, and see which option’s wording matches that exact restriction.

✅ Before You Answer

• Verify in the 46 CFR chemical cargo compatibility table how butyric acid and propylene oxide are marked relative to each other, especially for adjacent stowage. • Confirm whether octyl alcohol has any noted incompatibilities with either of the other two cargoes or if it is generally compatible. • Make sure you understand the difference between "incompatible" (cannot be carried together as specified) and "may not be stowed in a tank adjacent to" (adjacency restriction).