EHC fluid compatibility

The DR 46 is a phosphate ester.

So there is hope.

We use a couple of different versions of Supresta Fyrquel that are phosphate ester based.

I would call them.

Regardless, get someone like Herguth to do full comapatibility testing.

Webster,

As long you stay with the same base oil (phosphate ester?) you will not see any problems because base oils of the same kind are compatible. What causes possible incompatibility are different additive packages used for blending final product.

Take the advice from RobertC and send sample of your in-service oil and a sample of new oil to Herguth Labs for compatibility testing. I'd suggest calling them first to discuss your case; whether ASTM D 7155 would be the most appropriate in your case (maybe Tier 1 or Tier 1 and Tier 2 analysis) or some other method. Make a habit of testing for compatibility every time you plan to buy new oil for use either as a make up oil or the replacement oil. Such approach is the best assurance that you will not have any problems which may be caused by possible incompatibility.

Thank you for your recommendations. I will post additional details of the analysis.

quote:

Shell Irus DR46

There are a number of products that would be equivalent but first you need some info. According to the Shell data sheet while this is a phosphate ester fluid, Irus D46 it does not appear to be an EHC quality phosphate ester. Compatibility testing will tell you nothing useful. But, do you have servovalves and at what pressure do you operate. If yes to servovalves, consider an EHC quality fluid like you have ICL (Israeli Chemical Limited who now own the phosphorous facilities of Supresta/Akzo Nobel/Stauffer) Fyrquel EHC, EHC-S or EHC-N or Chemtura Reolube Turbofluid 46XC, 46B or 46. Some of these contain triphenyl phosphate which has been considered a severe marine pollutant so review the MSDS's carefully. I would suggest EHC-N or 46XC with is a trixylenyl type of triaryl phosphate ester that has better air release and better hydrolytic stability but costs a bit more.

If not an EHC fluid then you have even more options like Fyrquel 220, Reolube Hyd 46XC and the like.

Ken

quote:

phosphate ester fluid

Dear sir,

Just make the filtration of your phosphate ester fluid or your oils is Ok. It's simple.

Kevin

Sorry, but using the proper technique to purify steam turbine oils and EHC fluid is not always "easy". You have to know the nature of the contamination and the consequences. For example, with a steam turbine oil it might be high water but you also have to check what impact this might have had on your rust inhibitors and if from a steam leak what imparct the hydrazine might have had on the oil. You might save the oil but wreck the equipment. Similarly with EHC a high particle count might mean particulates that are easy to remove but it can also mean fluid degradation which is not so easy. Many systems can reduce the acid number but not that many are effective in raising the resistivity which can be just as important.