Heat rate vs. load at the live compressor inlet temperature
Expected heat rate from the cycle calibrated to the Siemens Energy SGT-400 data sheet (ISO 12.9 MW at 10,294 kJ/kWh, ◆), drawn for the live T1 and P1; dashed = ISO 15 °C. Dots = measured (fuel × LHV ÷ power). A fouled compressor or a worn hot section lifts the dots above the line.
Twin at live T1Twin at ISO 15 °CMeasured (trail)
Available power and heat rate vs. ambient
Base load of the twin (firing temperature limit; gas generator speed limit on cold days), ratio to ISO, ISO pressure and no losses. Dots: GPSA correction factors for industrial gas turbines. The live operating point is marked.
Power (twin)Heat rate (twin)GPSA pointsLive
Gas turbine train
Inlet filter, compressor, six combustor cans, compressor turbine, free power turbine, exhaust, gearbox and generator, with live sensor values. Red = beyond the twin's alarm limit.
Condition sensors
Bars against the alarm limits in the twin file (red line).