I would like to add to CC USERS post - I agree at first he was talking about steam turbine then EHC...
I would like to add that phosphate ester hydraulic fluid doesnt produce varnish. Its a bad myth going around the industry because it will show up on a colorimetric patch like it has a 100 critical varnish problem. At OILKLEEN we have cleaned numerous EHC systems and even drained these systems and climbed in reservoirs.
In all these systems I have never seen varnish on the reservoir wall. I mean Never!
I have seen this "apple jelly" looking substance on reservoirs like a bath tub ring, but this is NOT VARNISH.
Most of these system which produce the "apple jelly" bathtub ring are using selexsorb or fullers earth filters. These type of filters allow pounds of sub micron material to come off the filter and into the oil. This material is what will show up on a colorimetric patch test and appear to show varnish.
**Remember, a colorimetric patch test will show all insoluble foreign material. This is dirt, oxidation by-products, decomposed addtives, fullers earth material that comes off the filter, and selexsorb material that will come off the filter too.
TO SERVOCON ALPHA
One other thing I would like add is that I dont think its good to bash electrostatic filtration technology when you dont know how it works nor what is really happing in an EHC system. I do take it as a compliment that you would bash electrostatic filtration because soon OILKLEEN has an EHC system we will be launching that should stop servo rebuilds because this OILKLEEN EHC system will be the final solution.
Paul Jarvis