A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. NOTE 1—This test method was developed for mineral based oils. It may be used for some synthetic? NOTE 2—By agreement between the customer and the laboratory, the oil may be heated at other temperatures.

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Historical Version s - view previous versions of standard. Work Item s - proposed revisions of this standard. More D If the residence time in the reservoir is too short to allow the air bubbles to rise to the oil surface, a mixture of air and oil will circulate through the lubricating oil system. This may result in an inability to maintain oil pressure particularly with centrifugal pumps , incomplete oil films in bearings and gears, and poor hydraulic system performance or failure.

The significance of this test method has not been fully established. However, entrained air can cause sponginess and lack of sensitivity of the control of turbine and hydraulic systems. This test may not be suitable for ranking oils in applications where residence times are short and gas contents are high.

It may be used for some synthetic fluids; however, the precision statement applies only to hydrocarbon based oils. No other units of measurement are included in this standard. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

Scope 1. Link to Active This link will always route to the current Active version of the standard.


ASTM D3427

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Why You Should Be Measuring Air Contamination in Oil

While many people may be familiar with particle counters and the techniques for measuring moisture in an oil sample, few are aware of the methods for assessing the amount of air in oil or even that air is a serious form of contamination. In certain situations, air contamination has the potential to be very destructive, and its effects on oil and machinery deserve more attention. Air can be challenging to quantify. It may exist as a contaminant in the following states: dissolved, entrained, free and foam.


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