Inspection and Maintenance Instructions for 7FA.05 Gas Onl
and Dual Fuel Gas Turbine
GEK 116862
where the symbols are as follows:
4
d
B - 1
C
K =
.).(
)(
DIpipe
Di
orificeDo
B =
)(orificePSIP =Δ
2
)(INORIFICEOFAREAA ==
ρ
3
)(/ FTLBDENSITYWATER=
TCOEFFICIENDISCHARGEORIFICEC
d
=
The flow coefficient K for flange taps is determined experimentally; therefore, it may be extracted
from tables available in several references.
1*
D. Water Expansion Tank (if applicable)
If the turbine is equipped with an off base cooling water module, examine the internal surface of the
tank for cleanliness and the presence of algae or foreign matter.
E. Cooling Water Fan (if applicable)
If the turbine is equipped with an off base cooling water module, annually check the cooling water
radiator fans, the fan housings and the motors for cleanliness, vibration, noise, blade damage, rust and
corrosion, and mounting bolt security. Make sure there are no obstructions in the inlet and outlet duct
work and that screens are clean. For detailed information on the inspection, maintenance disassembly
and reassembly of the fan, refer to the instructions under the Cooling Water System in the Operation
and Maintenance Manual.
F. Cooling Water Pump
Check the pump for seal leakage either when running or stopped. Leakage is usually visible along the
pump shaft and/or from the drain port on the seal mounting flange. If there is unusual leakage, it is an
indication that foreign material has become lodged between the faces of the seal. This should be
corrected before further pump operation. If the leakage is profuse, it is an good indication that the
seal is worn and should be replaced.
Check the internal cleanliness of the mechanical seal cooling water circulating line. If this line gets
clogged, the seal can overheat and result in a pump failure. Also check the cleanliness of the abrasive
separator in the seal cooling line.
Whenever the pump is disassembled for any reason, the impeller-to-wear-ring clearance should be
checked. If the clearance exceeds twice the value recommended by the pump manufacturer, the wear
1*
ASME publication “Fluid Meters — Their Theory and Application” (Fifth Edition). Also, Crane Co., Technical Paper No. 410 “Flow of Fluids
Through Valves, Fittings and Pipe”.
© General Electric Company, 2011. GE Proprietary Information. All Rights Reserved.
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