Which of the listed actions should be carried out with the superheater vent valve during the time steam is being raised in a boiler?
The valve must be wide open all the time until the boiler is on the line.
The valve may be closed when all air is vented.
The valve may be partially throttled as the pressure increases until the boiler is on the line at which time it is closed.
The valve need only be open if the superheater temperature approaches 850°F.
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