Failure analysis of turbo-generator of a 10 MW captive power plant

The failure analysis of a disc and a few of the rotor parts of a turbo-generator of a 10 MW captive power plant has been made. It was found that a part of the rim of the 23rd disc, which had cracked by fatigue, became unstable and was flung off. This hit the diaphragm and the diaphragm carrier in its vicinity and led to their catastrophic failure.