🔍 Key Concepts

• Proper burner flame characteristics in a marine boiler during normal operation • Relationship between flame color and combustion quality (too rich, too lean, or correct air/fuel ratio) • Indications of soot, smoke, or overheating as seen in flame color

💭 Think About

• Think about what a clean, efficient flame should look like at the tip, away from the burner, when air–fuel ratio is correct. • Which colors usually indicate excessive temperature and possible tube damage versus normal, controlled combustion? • Which colors are commonly associated with soot, smoke, or incomplete combustion in boilers and burners?

✅ Before You Answer

• Eliminate any color that suggests very high, blistering temperatures near metal surfaces. • Eliminate any color that is normally linked to smoky, sooty, or dirty combustion. • Ask yourself: at the far end of the flame, should it look harsh/overbright, very dark, or like a steady, well-defined flame typical of normal boiler operation?