Tests for Evaluating Oil Filters

March 31, 2004
Subscribers: 34,991

Today's Tip

How to Stop Leaks

Book Bits
Synthetic Gear Oil Considerations

Lube-Trivia
Should Funnels Be Used?

Q & A
Tests for Evaluating Filters

Today's Tip: How to Stop Leaks

Where applicable, consider these ways to stop lubricant leaks: Reduce lubricant temperature, use grease instead of oil, tighten fittings, use mechanical seals or replace worn seals.

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Book Bits: Synthetic Gear Oil Considerations

From "Synthetic Lubricants and High-Performance Functional Fluids"

Both polyalphaolefin (PAO) and ester oils are sometimes blended with a certain percentage of mineral oil to create a semisynthetic combination that provides several advantages. Semisynthetic gear oils can provide performance near that of a pure synthetic, but at a considerably lower price. This combination also increases the solubility of certain additives that are required for high performance. Also the negative impact on nitrile butadiene rubber (NBR) seals can be reduced by adding a small amount of ester oil to a PAO gear oil. The blending of mineral oil and PAO oils is much more prevalent in automotive gear oil applications.

More information about the book "Synthetic Lubricants and High-Performance Functional Fluids"

Lube-Trivia: Should Funnels Be Used?

Test your knowledge and prepare for ICML lubrication and oil analysis certification.

QUESTION: Is it good practice to use funnels for topping-up machines?

Get the answer here.

Q & A: Tests for Evaluating Filters

"Apart from the data on the multi-pass filter test, what other ISO standards exist for the evaluation of filter performance that I can use to objectively select a filter?"

The ISO standard for multi-pass testing (ISO 16889) has changed to require filter manufacturers to publish their data for the beta ratios across a wide size range, that is, at 2, 20, 75, 100, 200 and 1000 microns.

Historically filter beta ratios were published at either 75 or 200 with an absolute rating (per ISO 4572). The new standard gives a better interpretation of the filter's overall performance, and can be better compared against competitor offerings.

In addition to the new multi-pass data, consider the following data:

ISO 2941 - 1974 - Verification of collapse/burst resistance.

ISO 2942 - 1994 - Verification of fabrication integrity and determination of the first bubble point.

ISO 2943 - 1998 - Verification of material compatibility with fluids.

ISO 3723 - 1976 - Method for end load test.

ISO 3724 - 1976 - Verification of flow fatigue characteristics.

ISO 3968 - 1981 - Evaluation of pressure drop versus flow characteristics.

These additional tests are useful for comparison where the installation may be an unusual lubricant, an extreme contaminant-sensitive workpiece, a high-pressure fluid power system or a safety critical application. When selecting for a noncritical system with no unusual requirements, evaluation of filter suppliers the multi-pass data, in addition to other commercial criteria, will normally suffice.

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Resources

APRIL 2004

Best Practices for Machinery Lubrication
5-7 Sunninghill, Johannesburg, South Africa
14-16 Daegu, South Korea

Machinery Lubrication I
14-15 Santiago, Chile
19-20 Miami, Florida
20-22 Gaborone, Botswana

Machinery Lubrication II
21-22 Miami, Florida

Oil Analysis I
5-6 Gaborone, Botswana
26-27 Tucumán, Argentina
27-29 Mexico City, Mexico
27-29 Point Lisas, Trinidad
28-30 Sao Paulo, Brazil

Oil Analysis II
28-29 Tucumán, Argentina
Técnicas de Lubricación
30 Mexico City, Mexico

MAY 2004

Machinery Lubrication I
10-11 Cleveland, Ohio
12-13 Lima, Peru
18-19 Point Lisas, Trinidad
18-20 Orapa, Botswana
25-26 Monterrey, Mexico
26-28 Sao Paulo, Brazil

Machinery Lubrication II
12-13 Cleveland, Ohio

Oil Analysis I
5-6 Orapa, Botswana
19-20 Buenos Aires, Argentina
19-21 Daegu, South Korea
24-25 Austin, Texas
24-25 Barcelona, Spain

Oil Analysis II
26-27 Austin, Texas
26-27 Barcelona, Spain

Oil Analysis for Engineers
6-7 Sunninghill, Johannesburg, South Africa

Entire training calendar | Course links

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