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Hello there,
We have currently carried out combustion inspection of our Gas Turbine (Frame 9E gas turbine) with Flender Graffenstaden TYPE AA30CZ. In parallel we carried out overhauling of Gas Turbine gearbox, we had the following observation during the overhauling:
1) Bearing of Shaft 4 at the lube oil end was found badly damaged but the damage was at a specific area and was very deep. The bearing at the hydraulic pump was also damaged but it was suspected as the hydraulic pump was not function(it dropped after our Hot gas Path Inspection).
2) Coupling of hydraulic pump was also damaged (Teeth at the hydraulic pump side were worn out completely). However it was also suspected as the hydraulic pump was down already.
What could be the probable reason for such a specific damage on the lube oil bearing (is it electric frosting or something)?
3) Also recently (about 6 months before) we faced the same problem with our Gas Turbine drive end generator bearing. It was the same kind of damage that we currently have faced with our gearbox bearing.
I just wanted to know why specific area damage in journal bearing occurs? What is the reason for it?
Waiting for your kind response.
Thanks
Izhar
We have currently carried out combustion inspection of our Gas Turbine (Frame 9E gas turbine) with Flender Graffenstaden TYPE AA30CZ. In parallel we carried out overhauling of Gas Turbine gearbox, we had the following observation during the overhauling:
1) Bearing of Shaft 4 at the lube oil end was found badly damaged but the damage was at a specific area and was very deep. The bearing at the hydraulic pump was also damaged but it was suspected as the hydraulic pump was not function(it dropped after our Hot gas Path Inspection).
2) Coupling of hydraulic pump was also damaged (Teeth at the hydraulic pump side were worn out completely). However it was also suspected as the hydraulic pump was down already.
What could be the probable reason for such a specific damage on the lube oil bearing (is it electric frosting or something)?
3) Also recently (about 6 months before) we faced the same problem with our Gas Turbine drive end generator bearing. It was the same kind of damage that we currently have faced with our gearbox bearing.
I just wanted to know why specific area damage in journal bearing occurs? What is the reason for it?
Waiting for your kind response.
Thanks
Izhar