Inspection and Maintenance Instructions for 7FA.05 Gas Onl
and Dual Fuel Gas Turbine
GEK 116862
in a given pre-cooler and still have the pre-cooler perform satisfactorily in gas turbine service. The
tapered plug material which is selected should be compatible with the pre-cooler bundle material.
Stainless steel plugs are compatible with stainless steel pre-cooler tubes. Brass plugs are
recommended for 90-10 copper-nickel tubes or for brass tubes or for admiralty metal tubes. These
plugs are installed in the leaking tube at the tube sheet using a nylon or rawhide hammer to prevent
inadvertent damage.
Water coolers should be checked for water to air side leakage every three months.
There is a continuous blow down line connected to the air side of the pre-cooler. This is to prevent
buildup of water and dirt. It should be checked regularly for plugging.
D. Air Separators
Check the air separator blow down lines for plugging by disconnecting the lines at the air separator
and blowing air through the lines. Check the low point drain and make sure this line is open also.
XV. WATER INJECTION SYSTEM (DUAL FUEL UNITS ONLY)
A. General Notes
In addition to these general guidelines, reference any detailed maintenance instructions provided by
the Water Injection Pump Skid (MLI A35A) vendor and the Water Injection Control Skid (MLI
A35B) vendor, including maintenance manuals for the individual components in the system (pump,
valves, etc.).
B. Water Injection Pump
Check the pump for proper operation as detailed in the pump maintenance manual. Check the pump
shaft seal for leakage and replace as necessary. Check for pump lube oil leakage.
C. Water Injection Control Valve
Check the control valve for proper operation and position signal calibration. Check for leakage at the
valve inlet, outlet, and shaft packing.
D. Water Injection Stop Valve
Check the stop valve for proper operation and check for leakage at the valve inlet, outlet, and shaft
packing.
XVI. HYDRAULIC OIL AND LIFT OIL SYSTEM
A. Hydraulic and Lift Oil Supply Pumps
Visually inspect the pump for seal leakage at the shaft and mounting flange. Check the pump for
noise and vibration. Check the inlet and discharge connections for leakage and/or loose connections.
To assure trouble free pump operation and a trouble free hydraulic system, it is important to maintain
the system in a clean condition. Sludge, water, dirt or contaminants of any kind are potential for
trouble.
Maintenance is limited to pump operations such as leaks or sticky valves which do not require a
complete system, or pump, teardown. First, tighten all screws or fittings around the leakage area. If
the pump still leaks, it may be necessary to replace a gasket, or “O” ring.
© General Electric Company, 2011. GE Proprietary Information. All Rights Reserved.
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