Abstract
A gas turbine exploded after 3 h of ordinary operation. This type of gas turbine works at maximum 5,100 rpm angular velocity and 18 MW output power. The rotor of the turbine had undergone repair after 77,000 operating hours and was then assembled on another unit of the power plant. Total operating hours and number of starts were 95,000 h and 4,785 times, respectively. The operating hours are listed in Table 1. The catastrophic failure caused heavy damages to the rotor and the casing. The marriage bolts of the rotor, the second stage buckets, and the shaft experienced high degradation. Approximately all turbo-compressor components—including inlet casing, compressor casing, discharge casing, turbine shell, exhaust hood, exhaust diffuser, exhaust plenum, inlet plenum, ACC gear, reduction gear, generator, couplings, piping of turbine surroundings, and combustor—were damaged beyond repair. The overall view of the failed gas turbine is illustrated in Fig. 1. Based on the primary information and data collected, three possible scenarios could be presumed for the accident:
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