Pitting corrosion on an Integrally geared compressor

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Dear All,

Recently a heavy pitting corrosion issue was found on a integrally geared compressor. Below is a brief summary.

* pinion thrust collar

- The pitting corrosion was mainly happened on active side of pinion thrust collar

- A mild pitting corrosion also was found on inactive side of pinion thrust collar

* pinion gear surface

- A severe pitting corrosion was found at loading flank of pinion gear

- A mild pitting corrosion also was found at non-loading flank of pinion gear

Based on your experience, Is this mainly caused by :

1. lube oil degradation

2. High load on these loading surfaces, causing the surface fatigue failure (pitting)

3. Both item1 and item2

4. others

Thanks for your kind comments in advance.

LUX

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Gear pitting failure

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