Your U.S. tankship is designed to carry anhydrous ammonia in bulk. The keel was laid in 1980. Which statement concerning the carriage of this cargo is TRUE?

Correct Answer: Option D — Aluminum and copper alloys are prohibited from being in valve parts in contact with the cargo.

Anhydrous ammonia reacts dangerously with certain metals, particularly copper and its alloys, forming explosive compounds. Therefore, 46 CFR strictly prohibits aluminum and copper alloys in valves and fittings directly contacting this cargo.