Hello.

Is there any established criteria to determine wheter an oil pass or fail this test? I have been reading a couple articles on the subject including 1 or 2 threads in the forum but i cannot find a concrete answer of the top limits.

Anyone can tell me where to look?

Thanks in advance.

Here's a basic overview of the test and test criteria from SouthWest Research. http://www.swri.org/4org/d08/global/FoamTend/default.htm

Hi Ariel,

Further to Michael's email, you will find that different oil types have different criterias and OEM's will also have a set of maximum limits to the test. For example, hydraulic oils and gear oils have different maximum limits.

For new oil limits, it's best to contact the oil supplier and get the details for each of the 3 sequence in the tests.

In addition, OEM's will also supply their own limits. For example Denison Hydraulic Requirements says that there should be "none" ie no foam for HF-0, HF-1 and HF-2 fluids. GEK turbine oil specs says 50/0 for sequence I, II and III in the test method. AGMA also have their own specs and requirements for gear oils eg AGMA 9005 says 50/0 upto an ISO VG 680 gear oil and 75/10 for ISO VG 1000 and upwards.

Basically, if the test ASTM D892 is performed and there is a persistent foam - you may have a problem depending on how it is effecting the performance of the equipment and safety factors.

Micbial and ReneWA:
Thank you for showing me where to look, the AGMA standard was very useful.

I found again that making a right decision involves a lot of reading.

Besides the data from these KIND guys, i found a couple papers thet were very useful for learning a little bit more of this kind of events and i want to share them with you.

"Silicon Doesn always mean dirt"
"The Perils of Aerated Oil"
"Using Oil Analysis to Monitor the Depletion of Defoamant Additives"
"Wear Limits Vs trends"
"Controlling Oil Aeration and Foam"
"Entrained Air Measurement in Coolant Filtration and Hydraulic Systems"

I am sure that if you are interested, you will not have any problem to find them, they are from a well known online magazine related to Oil analysis.

Thanks again guys.