A VERY COMMON mistake that people make is they ... assume ... that every GE-design MS6001B heavy duty gas turbine is like every other GE-design MS6001B heavy duty gas turbine, or Frame 5, or Frame 7E, or Frame 9FA, etc.
While the turbine (and axial compressor) is basically the same the auxiliaries are often not. Some MS6001B machines were packaged by GE in the USA; some were packaged by John Brown in Scotland; some were packaged by EGT or GE Power Systems Europe in Belfort, France. And, the various packagers often used similar but different auxiliaries and that can mean small or large differences between the "same" machines.
Without being able to see the P&ID for a particular machine we can't really provide much detail with any certainty--except to say there is a usually a hydraulically operated liquid fuel stop valve, a high-pressure liquid fuel pump which may or may not be driven through an electrically-operated clutch by the Accessory Gear, a liquid fuel bypass valve "around" the high pressure liquid fuel pump which is normally open and closes to send fuel to each of the ten turbine fuel nozzles through a liquid fuel flow divider (which sends equal amounts of fuel to each fuel nozzle), and through a liquid fuel check valve immediately upstream of each fuel nozzle (which will block the flow of liquid fuel until the pressure exceeds the rating of the check valve (sometimes two check valves in series are used to achieve the desired minimum liquid fuel flow pressure to the fuel nozzle to ensure proper atomization at low liquid fuel flow-rates) and finally through the fuel nozzle(s) of the combustor (some machines have multiple liquid fuel nozzles instead of a single liquid fuel nozzle, in which case there is ANOTHER small liquid fuel flow divider on each combustor to divide the fuel flow into multiple streams for the multiple fuel nozzles). The fuel nozzles are usually the type that atomize the fuel using the fuel pressure (no moving parts). When the fuel leaves the fuel nozzle tips it is usually further atomized using high-pressure atomizing air to help achieve optimum combustion (that's from the Atomizing Air system). There is usually at least one low-pressure liquid fuel filter upstream of the liquid fuel stop valve, sometimes two.
The liquid fuel is usually stored in a large tank not too far away from the machine and is "forwarded" (sent) to the liquid fuel inlet of the turbine using electric motor-driven liquid fuel forwarding pumps (usually, two redundant pumps operated in a lead-lag configuration), with a strainer upstream of the liquid fuel forwarding pumps to prevent rocks and other debris from damaging the pumps. There is often a spring-biased diaphragm pressure regulating valve to keep the pressure from the liquid fuel forwarding pumps to something less than 65 psig (a little less than 4 barg) at the inlet to the liquid fuel stop valve, and there is often an electrically-operated solenoid valve near the liquid fuel forwarding pumps to prevent any fuel flow when not required. The liquid fuel forwarding system may or may not have been provided with the machine, but the fuel has to be delivered to the machine from the storage tank(s) somehow--and it MUST always be delivered at less than the liquid fuel check valve(s) pressure at the combustor fuel nozzles.
There should be an Operations & Maintenance Manual provided with every GE-design heavy duty gas turbine which should be available to EVERY person who works on or operates the machine and its auxiliaries. There is usually a section of the manual which describes, in very brief detail, every system and can be used to help understand every system on the machine that was provided with the machine (again, some systems like the liquid fuel forwarding system may not have been provided with the machine by the packager). The P&IDs for EVERY machine system should be available to EVERY person who works on or operates the machine. In fact, EVERY person who works on or operates the machine should have their own copies of the P&IDs to study and make notes on and ask questions of the supervisors at the plant.
That's all I can do without seeing the P&ID for a particular machine.
