What is the minimum number of safety valves required on a boiler that has a heating surface of 42 m2?
a. None
b. One
c. Two
d. Three
e. Four
Answer: B
What is the minimum number of safety valves required on a boiler that has a heating surface of 42 m2?
a. None
b. One
c. Two
d. Three
e. Four
Answer: B