This is an overhauling report of a barrel type compressor. This compressor was a part of a compressor train, consisting of three barrel type compressors, driven by a steam turbine.
The compressor was installed between two barrel type casings and the whole casing had to be lifted and shifted to workshop for overhauling. The compressor casing was overhauled preventively and to inspect the extent of damage at the thrust collar area. The thrust collar has a history of damaging the thrust collar inner diameter and the rotor. Moreover, in previous overhauling damages were also observed on the key area. During last coupling and bearing inspection rusting was observed on thrust collar area.
After casing shifting to workshop and opening of head flange the coupling were removed and the thrust collar was removed using the arrangement shown.
The damage on thrust collar was inspected and after extensive study it was decided to change the fit style of thrust collar on the rotor. Previously the thrust collar was clearance fit with a clearance of 0.02 mm. The result is as shown.
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| Fretting on thrust collar area |
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| Sheared thrust collar key |
| The new thrust collar was machined with an interference of 0.05 mm and installed after heating on a new rotor. The rest of the overhauling was carried out in routine. Bearings and oil floating seals were replaced during the overhauling. During next overhauling the rotor and the thrust collar area was found in good condition. |
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