Group 2 Turbine Oil

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Forum Members,

I'm looking for information on group 2 turbine oil. I recently had contact with a steam generation plant that did a 100% change to a group 2 turbine oil(minus 20-30 gals of old group 1 turbine oil) and the plant lost key charecteristics of the turbine oil (demulsibility) and also had low RPVOT numbers - 75% of advertised value on delivery and 50% of advertised value in approximatly a year.

I have been in touch with the OEM and some independant companies to see if this is an isolated incident or have other facilities seen or had issues with group 2 turbine oils.

My question is have any of the forum members seen similar circumstances?

Any feedback would be appreciated.

5/15/0911:12 AM

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Original Post

renewaMember

I have come across cases where the previous turbine oil had been in service too long (way past it). The new oil put in place - however no flushing or cleaning of the system was performed prior to charging in the new oil. So the new oil now became flushing oil - it removed old deposits (which caused severe filter blockage issues) and lost much of it's original RPVOT values (halved)and showed signs of varnish in the oil within 6 months(tested via varhishing index potential), other problems such as loss of demulsability also surfaced. I'd suggest the problem is not with the Group II turbine oil but rather the cleaning and flushing process prior the changing the oil. The same problem would have surfaced even if a Group I oil was used as the new oil if inadequate cleaning or flushing was done.
What flushing and cleaning process happened before the change out? As a suggestion, ASTM D6439 "Cleaning, flushing and purification of turbinelubrication system" should be followed.

5/17/099:20 PM

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