Recently we have performed HGPI on one of our Hitachi H-25 Gas Turbines. Following that HGPI, a glaring observation regarding the wheel space temperatures was observed. The difference between 1st stage Fwd & 1st stage Aft temperatures is more than 60 degrees Celcius. Before the HGPI this difference was somewhere between 25 to 30 degrees.
Following parts are replaced during HGPI:
- 1st stage bucket with OEM guidelines
- 1st stage nozzle
- 1st stage shroud blocks
- Complete set of combustion parts (i.e. Fuel Nozzles, Combustion Liners, Transitions pieces & CrossFire Tubes)
Experts opinion is requested on the extent of this abnormality & the consequences of running machine with this increased temperature difference. Thank you!
Load | 5.8 MW | 9.8 MW |
1st Stage FWD | 427 | 437 |
1st Stage AFT | 358 | 366 |
2nd Stage FWD | 396 | 406 |
2nd Stage AFT | 386 | 406 |
3rd Stage FWD | 393 | 414 |
3rd Stage AFT | 247 | 268 |
Following parts are replaced during HGPI:
- 1st stage bucket with OEM guidelines
- 1st stage nozzle
- 1st stage shroud blocks
- Complete set of combustion parts (i.e. Fuel Nozzles, Combustion Liners, Transitions pieces & CrossFire Tubes)
Experts opinion is requested on the extent of this abnormality & the consequences of running machine with this increased temperature difference. Thank you!