		Gas Turbine Weekly Report
CE No.		Site		Date of Issue		Doc. No	IGT--
Unit No.		Stand		Data Received on		Rev.	1

1. Main Operating & Health Parameters

The main operating and health parameters of the gas turbine are listed in the following table for the past 30 days. (Station

PARAMETER	Min	Max	Avg
T0 (°C)
P0 (bar)
NGG (rpm)
Corrected NGG (rpm)
NPT (rpm)
Comp. Inlet Temp. (°C)
Comp. Outlet Temp. (°C)
Comp. Inlet Press. (bar)
Comp. Outlet Press. (bar)

PARAMETER	Min	Max	Avg
IGV Position (%)
RH (%)
Air Comp. Surge Margin (%)
T7 Avg (°C)
T7 Diff. Min to Avg (°C)
T7 Diff. Max to Avg (°C)
TITiso (°C)
TinGC (°C)
PinGC (psi)

Normal Caution Warning Danger

2. Cumulative Parameters

The following table summarizes the cumulative parameters of the station including total transferred gas, fuel consumption and load.

3. Gas Turbine Performance

In this section, the performance of gas turbine components including air filter, air compressor, combustion chamber and GG turbine is evaluated.

3-1. Air Filter

The pressure drop of filter and its corrected value are illustrated in below figure.

3-2. Air Compressor Performance

In following sections, the stability corresponding to the surge margin (stability check), the reliable performance zone, the efficiency performance (performance check) and the deviation check are investigated.

3-2-1. Stability Check

The operating point of the gas turbine engine is displayed in the air compressor characteristic map in the following curve; also the calculated surge margin is shown in this figure. The fixed lines at 10 and 20 percent of surge margins are also presented in the air compressor characteristic curve.

3-2-2. Reliable Performance Zone

The operating point of the air compressor for the past 30 days are displayed in the following characteristic curve.

3-2-3.Performance Check

Due to the importance of corrected NGG in the gas turbine performance, trends of efficiency and corrected NGG have been shown in the following figure.

3-2-4. Deviation Check

The following figures examine the deviations of mass flow rate and efficiency for air compressor.

3-3. Combustion Chamber

Condition monitoring of combustion chamber is considered challenging due to the lack of sensors in the hot section. Therefore, the performance analysis of combustor is performed based on the measured temperature at turbine outlet. In this section, the combustion chamber’s performance is monitored in two sub-sections. These monitoring features can demonstrate any deviation from proper performance.

3-3-1. Burners Diagnostic

As mentioned, the combustor’s outlet temperature cannot be monitored. As a result, burners’ performance should be evaluated using exhaust temperature. Therefore, a weight coefficient, Cj, is introduced which is the ratio between the TIT observed in the operating condition and the ideal TIT provided by manufacturer. Estimating the flow rotation and burners’ effect on the thermocouples, Cj can be calculated for each burner to evaluate its performance. For a healthy burner, Cj should be ideally one. If the Cj value is higher or lower than one, the corresponding burner is overfiring or underfiring, respectively. The accepted margin for Cj fluctuations is extracted from the previous statistics of healthy burners.

3-3-2. Thermocouples Monitoring

While many protection protocols of IGT25 are designed based on the temperature deviation of thermocouples from the mean TET, it is important to observe the difference of minimum & maximum T7 with the averaged thermocouples’ temperature, as presented in the following figure.