Question 330General Subjects - 1st Asst/Chief

The correct answer is D) A cap may be installed on the uptake outlet, and a ventilating unit may be installed to blow heated air into the furnace. When a boiler is laid up for an extended period with minimal utilities from shore, the firesides of the boiler need to be protected. Installing a cap on the uptake outlet prevents air from entering the furnace, which could lead to corrosion. Additionally, blowing heated air into the furnace helps maintain a positive pressure and temperature, further preventing corrosion and degradation of the boiler's internal components. The other options are incorrect because they either call for blowing cooled air into the furnace, which would not provide the necessary protection, or they involve capping the forced draft air intake instead of the uptake outlet, which would not effectively prevent air intrusion.