🔍 Key Concepts

• Bunker C fuel oil properties compared with lighter diesel fuels • Effect of temperature on viscosity of heavy fuel oils • Relationship between heating value, specific gravity, viscosity, and flash point

💭 Think About

• When you heat a very thick (heavy) fuel, what physical property changes the most to help it flow and spray through burner nozzles? • Which of the listed properties (heating value, specific gravity, viscosity, flash point) is primarily a chemical or inherent property, and which one can be adjusted easily by raising temperature right before atomization? • Think about what the burner or atomizer needs: a thin, easily sprayed fuel or a thicker, heavier one?

✅ Before You Answer

• Check which property is most directly linked to flow and spray quality through nozzles. • Consider which property of a given fuel does NOT significantly change just by preheating it a bit. • Recall that safe boiler/furnace operation tries to avoid increasing fire risk right at the burner—does preheating usually aim to raise or lower that risk?