On a boiler fuel system that has a "double block and bleed" arrangement:
a. The "bleed" valve is a normally open valve
b. At least one of the main line valves will always be open
c. The main gas valves open before the pre-purge stage
d. The main gas and vent valves open at the same time
e. The main gas valves are manually operated
Answer: C
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Power Engineering Chapter 64
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