Question 188Steam Plants - 1st Asst/Chief

The correct answer is C) 15 seconds. Modern boiler automation systems allow for a "trial for ignition" period during the burner light-off process, where the flame safeguard system is temporarily bypassed. However, this trial period is limited to a maximum of 15 seconds according to industry standards and regulations. This duration is in place to ensure safety by limiting the amount of time the burner can operate without a confirmed flame, preventing the potential buildup of unburnt fuel. The other options are incorrect because 5 seconds (A) and 10 seconds (B) are too short, while 30 seconds (D) exceeds the maximum allowable trial for ignition period.