Out board bearing lube oil being dis coloured
Out board bearing lube oil being dis coloured
(OP)
hello all
We have a 4 stage Centrifugal pump recently overhauled. After overhauling there was some abnormal noise from OB bearing ,We had changed that bearing(ANGULAR CONTACT BALL BEARING) ,now oil is being discolored in 3-4 days of running of pump. We have flushed and refill two times but getting same problem. I have observed temperature is also slightly higher than sister pump.
yesterday again drained whole oil and noted following points
1. It was discolored (dark brown )
2. No moisture observed
3. No any particle observed
4. Oil breather was found dirty
Following job done :
1. Drained whole oil from OB bearing housing
2. Flushed bearing housing with fresh oil (Three times)
3. Bearing housing filled by fresh oil (Turbine oil 46) up to the correct oil level
4. Oil breather & oil cup has cleaned
Skin temperature for OB bearing housing after running of 1/2 hrs of pump was 116 deg F ,for sister pump after 1 hrs it was 112 deg F.
Can any one suggest what may be the probable causes and what checks should be required for this type of problem?
We have a 4 stage Centrifugal pump recently overhauled. After overhauling there was some abnormal noise from OB bearing ,We had changed that bearing(ANGULAR CONTACT BALL BEARING) ,now oil is being discolored in 3-4 days of running of pump. We have flushed and refill two times but getting same problem. I have observed temperature is also slightly higher than sister pump.
yesterday again drained whole oil and noted following points
1. It was discolored (dark brown )
2. No moisture observed
3. No any particle observed
4. Oil breather was found dirty
Following job done :
1. Drained whole oil from OB bearing housing
2. Flushed bearing housing with fresh oil (Three times)
3. Bearing housing filled by fresh oil (Turbine oil 46) up to the correct oil level
4. Oil breather & oil cup has cleaned
Skin temperature for OB bearing housing after running of 1/2 hrs of pump was 116 deg F ,for sister pump after 1 hrs it was 112 deg F.
Can any one suggest what may be the probable causes and what checks should be required for this type of problem?





RE: Out board bearing lube oil being dis coloured
RE: Out board bearing lube oil being dis coloured
RE: Out board bearing lube oil being dis coloured
since before the change of the bearing everything was ok, i suspect something has gone wrong with the bearing. are you sure it is exactly the same type/size as the original, has it been mounted correctly, has anything else been changed? in normal operation the oil should last a lot longer, that same oil is used in steamturbines for decades without changing it running at temperatures of about 170 F.
RE: Out board bearing lube oil being dis coloured
Walt
RE: Out board bearing lube oil being dis coloured
Plan to remove O.B. housing and perform field brg. change out and inspect clean housing reinstall. You are relying on the shop that did the repairs ......