In many plants it is common for some machines to run high oil temperatures. However, if a high temperature persists higher and longer than expected and you are sure that the oil used is as per OEM, check the water supply to the cooler. Don't overly depend on the accuracy of the water flow. To check for water flow, close the return line and open the drain on the return line to see how much water flows out in a set time, say a minute. Compensate this flow by 5 to 10 percent for the back pressure offered by the return line. Compare this measured flow to the required flow rate. (Rohit Sharma, Manager Reliability Eng. BOC India Limited)

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Book Bits: What To Do When Oil Looks "Milky"

From the "The Practical Handbook of Machinery Lubrication"

Water contamination caused by condensation is a common problem in North American climates due to dramatic changes in temperatures.

Hydraulic or turbine oil with a "milky" appearance is an indication of water in excess of 2,000 PPM, and action must be taken to replace the oil, or remove the water through special filtration systems available for this purpose.

More information about the "The Practical Handbook of Machinery Lubrication"

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Question: Name three tests for evaluating load-carrying capability of grease.

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"Is there a color and shape code used to distinguish between different greases? For example, I have two motors side by side. One uses a lithium grease and the other uses a polyurea. I would like to provide added security to prevent the mixing of the greases. If there exists a color and shape code, perhaps the chances of cross contamination will be reduced. "

There is no standard in the industry for distinguishing one lubricant from another. That being said, several companies have developed their own standards. There are several steps to reduce or eliminate the instance of cross contamination between bearings.

1) Use tags to identify product type, quantity and interval. Colors and shapes can be used to tag grease guns, oil totes and transfer containers.

2) Consolidate lubricants. Instead of using a polyurea and a lithium-based EM grease, consolidate to one so all electric motors receive the same lubricant.

3) Use different grease fittings for different greases. This is an effective way of reducing cross contamination.

4) Training. Training is a most important component in proper lubrication.

Further information on this topic:

Best Practices for Lubricant Storage and Handling

Optimizing Maintenance Efficiencies With an Effective Greasing Program

Pursuing Lubrication Excellence at Boeing

Jason Kopschinsky, Noria Corporation

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