Normal pilot flame characteristics describe which of the following?

Normal pilot flame characteristics describe which of the following?

• A. It is colorless
• B. It is mostly blue in colour, burns steadily, and envelops 3/8 to 1/2 inch
• C. It is mostly red and unstable
• D. It is mostly yellow

Answer: (B)

A normal pilot flame is blue, steady, and has a small, uniform flame height. The blue color tells you the gas is mixing with enough air for complete combustion, which means efficient burning and less soot or CO production. A steady flame shows the gas supply and burner are functioning well without drafts blowing it out. The height of about 3/8 to 1/2 inch ensures the flame is long enough to stay lit reliably but not so tall that it causes instability or heat transfer issues. Colorless would suggest abnormal combustion, which can mean incomplete burning or a problem with ignition. A red and unstable flame points to poor air balance or a dirty/blocked burner, leading to unreliable operation and potential CO risk. A yellow flame indicates incomplete combustion and soot, also signaling insufficient air or burner cleanliness.

A normal pilot flame is blue, steady, and has a small, uniform flame height. The blue color tells you the gas is mixing with enough air for complete combustion, which means efficient burning and less soot or CO production. A steady flame shows the gas supply and burner are functioning well without drafts blowing it out. The height of about 3/8 to 1/2 inch ensures the flame is long enough to stay lit reliably but not so tall that it causes instability or heat transfer issues.

Colorless would suggest abnormal combustion, which can mean incomplete burning or a problem with ignition. A red and unstable flame points to poor air balance or a dirty/blocked burner, leading to unreliable operation and potential CO risk. A yellow flame indicates incomplete combustion and soot, also signaling insufficient air or burner cleanliness.