According to the illustrated main engine cooling water systems drawing, which labeled heat exchangers use sea water as a cooling medium? Illustration MO-0111

Correct Answer: Option B — 3, 4, 5, 6, and 24

Heat exchangers 3, 4, 5, 6, and 24 utilize sea water either directly or via central coolers as the ultimate heat sink, in accordance with standard marine engineering closed and open-circuit cooling loop designs.