Question 200Steam Plants - 1st Asst/Chief
70% to passWhich of the following represents a significant system limitation to be aware of when a burner management system is operated in the 'HAND' mode?
AThe flame failure alarm cannot function when the boiler is 'HAND' fired.
BSome boiler safety interlocks are bypassed when the boiler is 'HAND' fired.
CThe burner sequence control is fully automatic even in the 'HAND' mode.
DThe burner is not capable of maintaining a high firing rate when the boiler is in the 'HAND' mode.
AI Explanation
The correct answer is B) Some boiler safety interlocks are bypassed when the boiler is 'HAND' fired. When a burner management system is operated in the 'HAND' mode, certain boiler safety interlocks are intentionally bypassed to allow the operator more direct control over the burner operation. This can increase the risk of unsafe conditions, as the normal automatic safety checks are not in effect. The other answer choices are incorrect because: A) the flame failure alarm should still function in 'HAND' mode, C) the burner sequence control is not fully automatic in 'HAND' mode, and D) the burner is capable of maintaining high firing rates in 'HAND' mode, but the safety interlocks are bypassed.
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