GE 7FA.05 - Fuel Oil System (Dual Fuel Units Only); General Notes; Fuel Oil Stop Valve; Main Fuel Pump

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Inspection and Maintenance Instructions for 7FA.05 Gas Onl

and Dual Fuel Gas Turbine

GEK 116862

XIII. FUEL OIL SYSTEM (DUAL FUEL UNITS ONLY)

A. General Notes

In addition to these general guidelines, reference any detailed maintenance instructions provided by

the Liquid Fuel/Atomizing Air Module (MLI A162) vendor, including maintenance manuals for the

individual components in the system (pumps, valves, etc.).

Fuel oil system leakage may result in a fire or explosion if an ignition source is present. Ignition

sources may be hot surfaces (about 450°F (232°C) or hotter) sparks or open flame. The fuel oil piping

around the combustion chambers, the atomizing air system and the starting diesel engine exhaust are

particularly vulnerable.

B. Fuel Oil Stop Valve

Check the connections of the fuel oil and trip oil lines for evidence of leaking. Check the valve stem

for signs of stickiness, sluggishness, or failure to move within the time cycles specified in the Control

Specifications. For detailed instructions, refer to the Liquid Fuel System section in the Operation and

Maintenance Manual.

C. Main Fuel Pump

Check the shaft of the main fuel pump for leakage of the seal and replace if necessary.

D. Flow Divider

Check the flow divider for unusual noises and external leaks. Check the output pressure of the flow

divider, in accordance with the instructions in the Control Specification.

Verify the flow divider is free to rotate by removing the sealing plug located on the pickup wheel

housing and using a screwdriver to turn the exposed slotted shaft.

E. Fuel Nozzle Selector Valve

Check the tubing connections around the fuel nozzle selector valve assembly for excessive leakage.

Tighten fittings if necessary. Check the valve for smooth operation of the stem by turning the selector

to all positions. Check for secure mounting of valve.

F. False Start Drain Valve

Check for proper operation of the valve during startup and shut down. The valve should not be

venting while the turbine is in operation.