Engine : Steam Plants - 412/811
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| Under what operating conditions may water wall header drains be used for blow down? |
| A) When it is necessary for rapid drainage of the boiler. |
| B) During periods of carryover in the steam drum. |
| C) Only if the fires are secured and no steam is being generated. |
| D) When the water level is out of sight in the gage glass. |
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