Question 214Steam Plants - 1st Asst/Chief
70% to passUnder what operating conditions may water wall header drains be used for blow down?
AWhen it is necessary for rapid drainage of the boiler.
BDuring periods of carryover in the steam drum.
COnly if the fires are secured and no steam is being generated.
DWhen the water level is out of sight in the gage glass.
AI Explanation
The correct answer is C) Only if the fires are secured and no steam is being generated. This is the correct answer because the use of water wall header drains for boiler blow down is only permitted when the boiler is not actively generating steam. If the fires are still active and steam is being produced, using the water wall headers to rapidly drain the boiler could lead to dangerous conditions and damage to the boiler. The other options are incorrect because they describe situations where rapid boiler drainage would be unsafe or unnecessary.
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