Sodium & Silicon in oil analysis?

[brazer]

Hi ,
Just received some oil analysis back & have a couple of queries;
One sample has flagged up a caution for Sodium at 10ppm ; The compressor is a Bitzer screw on a water chiller; all other readings are good. Where would this come from ............assuming its probably from the oils additive pack but would like to know if there's anything else it could be.

On another oil sample related question; keep getting samples back with silicon flagged as caution; usually ranging up to 30 ppm but more often around 10 to 20 ppm. Suspect its coming from the drier cores but wondered if there could be another cause ( FYI; All samples from water chillers, primarily from screw compressors).

Any advise most welcome

Thanks in advance .

B

[Brian_UK]

You asked this question a while ago, why start again.
http://www.refrigeration-engineer.co...ilicone+sample

[brazer]

Didn't really get anything conclusive then regards silicon but now also questioning the 'sodium' ; which I didnt ask about previously.
Thanks
B