Alberta Special Oilwell Boiler Practice Test

What is the maximum flame failure response time allowed?

1 second or less. 4 seconds or less. 8 seconds or less. 6 seconds or less.

Correct Answer:

4 seconds or less.

Explanation:

Flame failure response time is the maximum time allowed for the flame safeguard to detect that the flame has gone out and to shut off the fuel supply. This safety limit helps prevent unburned fuel from continuing to flow and leaking into the combustion chamber, which could lead to dangerous buildup or an explosion risk. The specified limit is four seconds or less because that duration provides a rapid enough response to stop fuel flow quickly while still being practical for typical burner sensing and interlock systems. Times longer than this increase the chance of fuel accumulation, while a very short requirement could cause unnecessary shutdowns in normal operation. Therefore, four seconds or less is the correct standard.

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