bearing running hours
bearing running hours
(OP)
Hi guys,
i would like your opinion on this problem,we use radiator to cool the water on our 17 MW diesel generator and i am trying to find out is there a specific running hours for the motor bearing to be changed,the product manual say to grease at 15,000 to 30,000 hours and the generator is only 36,000 hour so do u guys think the bearing need to change basic on running hours or conditions thank you .
i would like your opinion on this problem,we use radiator to cool the water on our 17 MW diesel generator and i am trying to find out is there a specific running hours for the motor bearing to be changed,the product manual say to grease at 15,000 to 30,000 hours and the generator is only 36,000 hour so do u guys think the bearing need to change basic on running hours or conditions thank you .





RE: bearing running hours
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: bearing running hours
RE: bearing running hours
Sorry but the crystal ball is a bit hazy at the moment.
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: bearing running hours
RE: bearing running hours
Anyway back to the question, if it were me, I would ask the electric motor manufacturer what L10 bearing life was used in the design, having this info you can then make an informed decision about bearing replacement periods.
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: bearing running hours
As said before, ask your manufacturer to find out for what lifetime they were designed, and change them accordingly.
NX 7.5.5.4 with Teamcenter 8 on win7 64
Intel Xeon @3.2GHz
8GB RAM
Nvidia Quadro 2000
RE: bearing running hours
RE: bearing running hours
NX 7.5.5.4 with Teamcenter 8 on win7 64
Intel Xeon @3.2GHz
8GB RAM
Nvidia Quadro 2000
RE: bearing running hours
For more than a decade SKF and FAG have been saying that ball bearing life can be infinite at some low-ish load level, if lubrication quality and cleanliness can be maintained.
Exchanging bearings on a schedule can bring real danger of poor overall reliability when infant mortalilty strikes less than perfectly executed repairs.
Methods exist to evaluate a ball bearing's condition and get the most life out of a bearing, and avoid failure. Vibration analysis is a favored and effective method.
RE: bearing running hours
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: bearing running hours
In reality, the speeds and loads this fan bearing are subject to in normal service are probably quite modest. In theory, if this bearing were kept free from moisture and debris, and were properly lubricated, it would have a virtually unlimited life. Moisture intrusion is probably the most problematic issue with grease lubricated rolling element bearings. Heating/cooling cycles of the engine can cause any humidity trapped within the sealed bearing space to condense into droplets, and the droplets then causes corrosion pitting on the race surfaces. These corrosion pits on the race surfaces quickly lead to spalling failures.
The easiest, cheapest, and most effective way to ensure long life for this particular bearing would be to lubricate it every 500 hours rather than every 15,000-30,000 hours. When lubricating the bearing, it is essential that sufficient fresh grease is added to ensure that all of the existing grease within the bearing is displaced, along with any trapped moisture or debris.