🔍 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?