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I need typical limit of exhaust temperature GE Frame 5 gas turbine.
Spread temperature
- Thread starter HazimHamad
- Start date
@HazimHamad,
The title of your post is “Spread temperature.”
In your post you ask for a typical exhaust temperature limit of a GE-design Frame 5 heavy duty gas turbine.
A typical exhaust temperature spread limit for a machine in new and clean condition operating at ISO conditions (nameplate ambient temperature and atmospheric pressure) is not a fixed number; it depends on a few factors but for the conditions described above the typical exhaust temperature spread limit would be around 40 degrees C, plus or minus two or three degrees C--approximately.
The typical exhaust temperature limit for a machine as described above would be around 592 deg C.
A GE design heavy duty gas turbine isn’t tripped on the magnitude of the difference between the highest and lowest exhaust temperatures—it is tripped based on both magnitude AND adjacency (meaning a number of exhaust thermocouples that have high differentials must also be close to each other—signifying a combustion problem or hot gas path hardware problem affecting a small arc of the exhaust temperature spread limit ”circle”).
If you are concerned because one or more exhaust thermocouples has a red color and you believe the turbine should be tripped then you don’t understand how the combustion monitor algorithm works. It’s not just the magnitudes of individual exhaust temperatures—it’s also the adjacency of the highest exhaust temperature and a couple of the immediate lesser exhaust temperatures.
The title of your post is “Spread temperature.”
In your post you ask for a typical exhaust temperature limit of a GE-design Frame 5 heavy duty gas turbine.
A typical exhaust temperature spread limit for a machine in new and clean condition operating at ISO conditions (nameplate ambient temperature and atmospheric pressure) is not a fixed number; it depends on a few factors but for the conditions described above the typical exhaust temperature spread limit would be around 40 degrees C, plus or minus two or three degrees C--approximately.
The typical exhaust temperature limit for a machine as described above would be around 592 deg C.
A GE design heavy duty gas turbine isn’t tripped on the magnitude of the difference between the highest and lowest exhaust temperatures—it is tripped based on both magnitude AND adjacency (meaning a number of exhaust thermocouples that have high differentials must also be close to each other—signifying a combustion problem or hot gas path hardware problem affecting a small arc of the exhaust temperature spread limit ”circle”).
If you are concerned because one or more exhaust thermocouples has a red color and you believe the turbine should be tripped then you don’t understand how the combustion monitor algorithm works. It’s not just the magnitudes of individual exhaust temperatures—it’s also the adjacency of the highest exhaust temperature and a couple of the immediate lesser exhaust temperatures.
