Bearing with too high temperature in summer, how to cool it?
Bearing with too high temperature in summer, how to cool it?
(OP)
Hi! This subject is somewhat new to me, however I studied it quite deep at my graduation course. The case: Steel industry,i was called to meet three motors each with power of 250 kW, two bearing and a the motor shaft in between. In summer time the temperature rises up to 95 to 98 ºC. They ask me how to cool it? With new bearings having some closed circuit where cool-water from cooling-tower, will circulate as function of the bearings temperature? Or taking other approach less invasive, cheaper. Any tip, hint will be most appreciate. Tks to you All.





RE: Bearing with too high temperature in summer, how to cool it?
If you have greased bearings, I don't think there is much hope to apply external cooling.
If oil, maybe you can cool the oil reservoir.
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(2B)+(2B)' ?
RE: Bearing with too high temperature in summer, how to cool it?
As a matter of fact, there's some critical issues about the possible thermal-shocks. In fact, we have to explore the oil approach. I must confess, was thinking in this direction too and your opinion enforces it indeed, in spit of looking at the problem from other perspectives as well. I do thank you for your advice and expertise. I hope to hear from you again and the Forum, because this is a very common situation we have to deal with in process industries.
Any contribution will be welcome, thank you all.
RE: Bearing with too high temperature in summer, how to cool it?
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RE: Bearing with too high temperature in summer, how to cool it?
RE: Bearing with too high temperature in summer, how to cool it?
RE: Bearing with too high temperature in summer, how to cool it?
RE: Bearing with too high temperature in summer, how to cool it?
I would want to take a closer look at the oil used in the bearings. It is not unusual for excessive viscosity to be used based on the assumption that it will provide better wear protection for the bearings. This is particularly true where elevated bearing temperatures are being experienced. You may find that substituting a suitable lower viscosity oil with good thin film strength properties may cure the problem. The needlessly high viscosity oil can lead to high temperature problems or even cause the high temperature problem due to the greater fluid friction involved.
I've encountered cases where the effects of using a lower viscosity oil eliminated all of the previous bearing cooling problems, and bearing life increased.
Valuable advice from a professor many years ago: First, design for graceful failure. Everything we build will eventually fail, so we must strive to avoid injuries or secondary damage when that failure occurs. Only then can practicality and economics be properly considered.
RE: Bearing with too high temperature in summer, how to cool it?
Thank you for your expertise and advice! No doubt we are approaching to the solution, "I can feel it", something in the line of what CCFOWLER wisely expressed in his post.
My "technical feeling" says that the main solution is related with the oil system and its lubrication capacity in those almost extreme conditions, if we have to increase the oil rate or not and one important aspect said by CCFOWER, the oil viscocity. Maybe we can use it of a bit lower viscocity without compromise the "wear protection for the bearings.",as CCFOWLER has mentioned as well.
ASnd if this is not enough the CHICOPEE's suggestion can work pretty good, I would applied in a second approach to the problem, in addition, if you allow me to say so. Thanks so much.
RE: Bearing with too high temperature in summer, how to cool it?
are you sure the oil you use is in accordance with the manufacturers instructions for this type of operation? most times instructions are given ofi a more general nature together with a suitable viscosity at 40 degrees C. those do not necessarily apply in specific cases.
RE: Bearing with too high temperature in summer, how to cool it?
Is the air restricted excessively to try to prevent the moist cooling-water-entrapped air from getting near the motor/ 100 C - if not needed for some other reason - is high based on my experience in power plants.