We’ve been running a GE 7FA.04 DLN 2.6 in peaking mode for the past two years. We’re noticing cracks in the combustion liner sooner than expected, especially after hot restarts. Additionally, we are observing TBC (Thermal Barrier Coating) spallation within the first 1000 operating hours, particularly on the combustion liners. Has anyone else experienced similar early spallation issues? Any suggestions for mitigating this problem?
We’ve seen early TBC spallation as well. In our case, adjusting the firing temperature and improving cooling air flow distribution helped reduce the issue.
Are you using a standard coating, or have you explored more advanced ceramic coatings? We’ve found that ceramic coatings last longer in peaking operation.
We had a similar issue with our combustion liners. After consulting with GE, we started logging more detailed wear patterns during inspections.