One purpose of the small valve on top of the shell or the water column on most boilers is to ___
a. Signal when the boiler is full of water r.
b. allow water into the boiler when the boiler is being drained or cooled preventing the formation of a vacuum.
c. allow water to escape before the steam stop valve is opened during the warm-up period.
d. allow air to escape from the boiler when the boiler is being filled with water.
e. allow air into the boiler when the boiler is being filled with water.
Show Answer
Answer: D