We at our Gas plant are having issues with the turboexpander lubricant (Turbo T 100) getting low viscosity and low flash point due to gas contamination in the lubricated bearings. This has caused several bearing failures in past years. I have come to know that this is a common problem with many other operators for the lubricated bearings of turboexpanders.
We are replacing the contaminated lubricant on frequent basis to avoid failures.
Although new turboexpanders are manufactured using non lubricated bearings, i.e. magnetic bearings, however we have to find a solution for the old units.
Can others share their experience and ways to resolve this issue ?