Inspection and Maintenance Instructions for 7FA.05 Gas Onl
and Dual Fuel Gas Turbine
GEK 116862
© General Electric Company, 2011. GE Proprietary Information. All Rights Reserved.
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Check the output of the transmitters. In case specified output is not available or the output is erratic,
check impulse piping, electronics and power supply. Carry out trouble shooting per manufacturer’s
recommendation.
XXVIII. BLADE HEALTH MONITORING
The blade health monitoring system measures blade characteristics to determine hardware health. This
system includes a sensor that measures the signals and a controller that interprets those signals and
transmits them to a remote location for analysis; this system does not directly interface with the turbine
control panel. Maintenance for this system includes ensuring that hardware is not damaged during
outages, confirming system installation, and testing sensors for operability.
A. Blade Passing Signals
Blade Passing Signal peak values should be checked at original values prior to the start of the major
outage.
B. Distortion
Distortion, if any, of the blade passing signals should be checked prior to the start of the major
outage.
C. Sensor Integrity
Sensor integrity should be checked for corrosion, specifically for devices on the lower half of the
compressor casing.
D. Required Actions During Interface Maintenance
Reference Blade Health Monitoring section of the Operation and Maintenance Manual for required
actions when maintenance is performed on systems which interface with the BHM system.
XXIX. COMBUSTION DYNAMICS MONITORING
The combustion dynamics system measures pressure fluctuations in the combustion can to monitor
system operation. This system includes a sensor mounted in a probe holder; the sensor measures the
combustion perturbations and transmits a signal via a cable to a charge amplifier. The charge amplifier
converts the probe output signal to a voltage output for analysis by a control card in the turbine control
panel. Maintenance for this system includes confirming that the probe holder does not have any residual
water or other material, re-calibrating sensors as necessary during outages, and re-calibrating charge
amplifiers as necessary during outages.
A. Probe Calibration
CDM systems use very delicate components that must be maintained properly in order to achieve
reliable operation. The probes used in the system will experience sensitivity drifts and signal
degradation over time. As a result, GE recommends that each probe be calibrated or replaced at least
every two years or at each C.I. (Combustion Inspection Outage).
Refer to Combustion Dynamics Monitoring section of the Operation and Maintenance manual for
detailed instructions on probe calibration.
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