Which brand oil is better? D46 or D68
Question
Hi
this is Ali from csp -co
I have a question
could you help me?
we have screw comperssors (six plants) with (250KW POWER) The Airends are (Rotocomp)
WE USE THIS BRAND OIL:shell corenna D46
but a person (commperssor guider) told me FOR SCREW COM D68 is beter than D46
I dont know which one must be use ?
which one is beter (D46 or D68)?
please reply
thank you for every thinghs
Best Regards
Ali
1 Answer
Hello Ali,
Sorry I'm not an expert on compressor oils, but the main difference between those two oils is the viscocity.
D46 = 46 [mm2/s]
D68 = 68 [mm2/s]
(this is at 40 degrees Celsius). See here: http://www.alba.al/files/products/GPCDOC_TDS_Corena_D.pdf
But viscosity itself tells NOTHING about the quality of the oil. The other oil properties are far more important, as well as the stability of the viscosity over the temperature range (the viscosity index).
In general, the lower viscosity oil (D46) would be used in colder running conditions (0-25 degrees ambient temperature), and the higher viscosity oil (D68) would be used in warmer running conditions (25+ ambient temperature).
In your case, I would check the viscosity that the manufacturer suggests for your compressor, or compare to the original oil which is suggested by the manufacturer.
Hope this helps
Cas
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