🔍 Key Concepts

• fuel purge valve purpose in a marine gas turbine (what problem is it preventing?) • relationship between the start/stop sequence and purging residual fuel from the combustor and fuel manifolds • whether the purge function can be manual, automatic, or both on a typical automated shipboard gas turbine

💭 Think About

• Look at where the purge line is located in the system and think about what must happen to any leftover fuel when the turbine is shut down or before a restart. • Ask yourself at what point in the start sequence you would want the fuel lines and manifolds to be clear of liquid fuel, and how an automated control system would normally handle that. • Consider whether operators are usually required to open and close this valve by hand on every start, or if the control/auto‑sequencing system normally handles it once certain conditions (speed, time, or shutdown) are met.

✅ Before You Answer

• Verify why it is unsafe to leave unburned fuel in the combustor or manifolds before the next light‑off attempt. • Check whether normal marine gas turbine control systems use automatic sequencing for fuel system valves during start and shutdown. • Confirm from the diagram or your study material if there is any indication that the valve can also be operated manually in addition to any automatic function.