Marine gas turbine fuel oil systems, as shown in the illustration, require fuel oil shutdown valves to be _________. Illustration GT-0021

Correct Answer: Option A — piped in series

Marine gas turbine fuel systems mandate that fuel oil shutdown valves be piped in series to provide redundant isolation. This configuration ensures that if one valve fails to seat properly, the second valve prevents fuel from reaching the combustion chamber, effectively mitigating the risk of engine fires or uncontrolled restarts.