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Link between filter blockage - anti foam additive?

T thomasvanderschuerenLevel 2 - 51 to 100 posts
Hallo,

I have a hydraulic system with following specifications:
- oil: Petronas Sunvis 846 WR - HV, 3000l
- max pressure 160bar

Every 2 weeks I have to change the 2 off line 3µ filter elements because of filter blockage.

We analysed the oil and the results are good. No severe contamination.

Now we analysed the filterelement and a there is a gelatinous substance with high viscosity on all the surface of the membrane
Si: 1748ppm
Ba: 425ppm
toluene insoluble: 54,74 %wt
heptane insoluble: 55,06 %wt

The oil temperature before the filter is 35°C and the tankvolume is less than 1000l when the machine is in full operation.

Is it possible that the VI improvers or antifoam additives block the filter element?

Kind regards!

Gilles
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nurudinnurudinMember
Hello Gilles,

good news, that your filter is work

The oil that you analyzed (and showing normal) was the fresh oil, or the in-service oil?

Mostly i found insolubility of additive, on GEAR OIL type. Rare I found on Hydraulic Oil. Ussulally it was come from EP additive package, which could not diluted propely.

I am not so sure if your case was came from additive. do you have any other observation?

regards,

Nurudin
D doubleeMember
Gilles - where is the sample point on this system that you are drawing the sample from? Is it before the filter and somewhat close to the filter housing?

Is it possible the system is being contaminated with grease ingestion before the filter, the filter is catching this contamination, but due to your sample point you are not detecting it in the oil analysis??
T thomasvanderschuerenLevel 2 - 51 to 100 posts
Hi,

The oil sample was taken just before the filter (attachement).
Yesterday I was informed that the oil does not contain antifoam additive so it must be an external (or internal) contamination.
In the book "sourcebook for used oil elements" I read that barium and silicone (and iron) can be contamination from electric furnace dust. The installation is next to an electric furnace for melting aluminum... But it is indeed strange the elements were not find in the oil analysis.

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R rttechMember
Hi Gilles, the extra info you provided indicates enviromental contamination, you can check 2 ways,
1 Mix some environmental dust with new oil and run through the spectrographic anlaysis, if we are correct the results will be similar to the lab results you provided, if Fe and Cr are missing that would be wear.
2 Open the filter and complete a wear debris analysis on the media as this will show the contaminates removed from the system,
or complete both.
regards
Rob S
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