🔍 Key Concepts

• waste heat boiler purpose on diesel ships • difference between main propulsion steam and auxiliary services steam • how ships typically use exhaust gas heat recovery

💭 Think About

• Think about where the heat for a waste heat boiler actually comes from on a diesel vessel and how reliable that source would be in an emergency. • Ask yourself which of these options represents a common, continuous demand for steam that benefits from using otherwise wasted exhaust heat. • Consider which systems on board normally run on steam produced from exhaust gas rather than from a separately fired main boiler.

✅ Before You Answer

• Verify which systems on a diesel vessel typically operate from exhaust gas/waste heat boilers. • Check whether emergency propulsion would depend on diesel exhaust being available. • Confirm which of the listed uses is a regular auxiliary steam load rather than a rare or emergency-only function.