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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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.
However, the precision at these different temperatures is not known at present. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Referenced Documents 2. Terminology 3. Summary of Test Method 4. Current edition approved Nov. Published December Originally approved in Last previous edition approved in as 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? The signi? 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. Apparatus 6. The component parts are described as follows: 6. The two parts of each test vessel should be marked and preferably used as a pair. Interchanged parts may be used so long as the resultant test vessel conforms to the stated dimensions. Back pressure in excess of a gage pressure of 70 kPa 10 psi can be generated when the bath medium is pumped at the required rate; this can cause fracture of the glass or slippage of the hose connections.
Use of a pressure relief valve set at 70 kPa 10 psi is recommended. In addition, use of a safety shield is recommended. Materials 7. Unless otherwise indicated, it is intended that all reagents conform to the speci? Warning— Flammable. Health hazard. Air from a cylinder or a nonpulsating pump may be used.
Warning—Compressed gas under high pressure. NOTE 6—Previously, chrome sulfuric acid was used in this procedure. Other test methods for example, Test Method D have demonstrated acceptable, statistically equivalent results when Nochromix or Micro is used to replace sulfuric chromic acid for cleaning.
A temperature sensor of at least equivalent performance is also suitable. Care shall be taken to avoid restricting the air path with the thermometer bulb or any adapter used.
A coil of copper tubing immersed in the circulating bath see 6. This can be obtained by an additional bath, or by using a separate steam or electric heat exchanger. The temperature of the air shall be measured by a thermometer located as close as possible to the testing vessel and meeting the speci? NOTE 3—The application of thermal insulation to the pipework carrying the heated compressed air is recommended.
Harmful if inhaled. Pharmacopeial Convention, Inc. Your comments will receive careful consideration at a meeting of the responsible technical committee,1 which you may attend.
Box 70, Burlington, NJ NOTE 4—Use of water in the bath has been found to minimize electrostatic effects. NOTE 5—The application of thermal insulation to the pipework carrying the heated bath? Warning—The use of glass vessels with glass host? Preparation of Apparatus 8.
NOTE 8—Oil misting occurs during blowing. The test vessel should be in a hood, or the air outlet tube should be connected to a vent that removes the vapors. NOTE 11—The test may be run for a longer period of time by agreement between the laboratory and the customer.
NOTE 12—For some applications, the shape of the air release time curve may be required. This can be implemented by recording the density at intervals, as required. Procedure 9. Set the compressed air temperature to within 0. Set the circulating bath to give a specimen temperature within 0. The required bath temperature setting and time for the specimen to equilibrate can be established for an equipment setup by making trial runs with a thermometer in the oil specimen.
Allow the sample to reach the test temperature. This may take about 20 min. When the sinker has reached the test temperature, immerse it in the sample, taking care that no air bubbles cling to it.
Attach the sinker to the beam of the density balance by means of the platinum wire so that the bottom of the sinker is 10 6 2 mm from the bottom of the test vessel. This will be noted if the time for the density to return to the initial? Where air release value information is required for such oils, an air releasing time curve may be drawn. If the loss causes any part of the sinker to be exposed, discontinue the test and repeat, using a sample that is 10 mL larger than previously used.
Calculation of Density Reporting Precision and Bias 7 9. After 5 min, start the supply of air at a gage pressure of 20 kPa at the required temperature. Attach the wire to the beam and maintain a distance of 10 6 2 mm between the bottom of the sinker and the bottom of the test vessel.
NOTE 15—The program was run by six laboratories, using? Five samples were tested at one temperature and four at another. Since some reports were incomplete, this resulted in 48 pairs of replicated data. If the time is greater than 30 min, discontinue the test. There is no known bias relative to the DIN 51 method. A new interlaboratory test program is planned. For ready comparison, the above statement is shown in DIN terms in Table 1. Keywords C0 has identi?
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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. The normal level of dissolved air for mineral oils is 10 percent by volume. High levels of dissolved air from pressurized oil accelerates additive depletion and oxidation. Entrained air can be characterized as unstable, suspended microscopic air bubbles in oil, which results in clouding of the oil.
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.