What is the normal time interval for c-inspection on gas turbine?

1200 Firing days this is for GE frame6 gas turbine.

For GE gas turbines frame6 it is12000 hrs, also you to consider the fire starts

aftar7500 hr

 there is formula for this which have many factor. check the manufacturing for the gas turbine. these factor are:

* firing hours

* count of trips

* stop/start count 

* type of the fuel rich or lean

*

in these days owner can eliminate the CI and go directly to HGPI then major which will save down time. This can be done by upgrading the liner and TP to new design and material. 

 

 

The LP compressor (Fan) Blades special inspection TASKS applicable to both A1 and A5 models are as category B1, B2 (V2500 EM72-00-00) must be tested every visit to make sure that it continues to give satisfactory operation A computer-processed C-scan image, Some C-scan systems, particularly automatic units, incorporate additional electronic gating circuits for marking, alarming, and charting.
These gates can record or indicate information such as flaw depth or loss of back reflection, while the main display records an overall picture of flaw distribution

16000 HRS

Combustion8000 fired hours for gas and distillate

Hot gas path24000 fired hours gas or16000 fired hours distillate

major48000 fired hours gas or32000 fired hours distillate

for MS3002