ASTM D943-17(R2017) pdf free download
ASTM D943-17(R2017) pdf free download.Standard Test Method for Oxidation Characteristics of Inhibited Mineral Oils
1. Scope
1.1 This test method covers the evaluation of the oxidation stability of inhibited steam-turbine oils in the presence of oxygen, water, and copper and iron metals at an elevated temperature. This test method is limited to a maximum testing time of10 000 h. This test method is also used for testing other oils, such as hydraulic oils and circulating oils having a specific gravity less than that ofwater and containing rust and oxidation inhibitors. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.2.1 Exception—The values in parentheses in the figures are provided for information for those using old equipment based on non-SI units. 1.3 WARNING—Mercury has been designated by many regulatory agencies as a hazardous material that can cause central nervous system, kidney and liver damage. Mercury, or its vapor, may be hazardous to health and corrosive to materials. Caution should be taken when handling mercury and mercury containing products. See the applicable product Ma- terial Safety Data Sheet (MSDS) for details and EPA’s website—http://www.epa.gov/mercury/faq.htm—for addi- tional information. Users should be aware that selling mercury and/or mercury containing products into your state or country may be prohibited by law. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety and health practices and determine the applica- bility of regulatory limitations prior to use. For specific warning statements, see Section 6. 1.5 This international standard was developed in accor- dance with internationally recognized principles on standard-ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
4. Significance and Use
4.1 This test method is widely used for specification pur- poses and is considered of value in estimating the oxidation stability of lubricants, especially those that are prone to water contamination. It should be recognized, however, that correla- tion between results of this method and the oxidation stability of a lubricant in field service may vary markedly with field service conditions and with various lubricants. The precision statement for this method was determined on steam turbine oils. N OTE 1—Furthermore, in the course of testing a lubricant by this method, other signs of deterioration, such as sludge formation or catalyst coil corrosion, may appear that are not reflected in the calculated oxidation lifetime. The subcommittee responsible for this method is investigating the application ofalternative criteria for evaluation oflubricants using this test apparatus. Test Method D4310 is now available for sludge measure- ment.
5. Apparatus
5.1 Oxidation Cell, of borosilicate glass, as shown in Fig. 1, consisting of a test tube, condenser, and oxygen delivery tube. The test tube has a calibration line at 300 mL (maximum error 1 mL). This calibration applies to the test tube alone at 20 °C. 5.2 Heating Bath, thermostatically controlled, capable of maintaining the oil sample in the oxidation cell at a tempera- ture of 95 °C 6 0.2 °C, fitted with a suitable stirring device to provide a uniform temperature throughout the bath, and large enough to hold the desired number ofoxidation cells immersed in the heating bath to a depth of 390 mm 6 10 mm and in the heating liquid itself to a depth of 355 mm 6 10 mm. N OTE 2—Metal block heaters meeting the test method requirements may also be used. It is not known what types of heating baths were used in developing the precision statement. 5.2.1 Studies have suggested that direct sunlight or artificial light may adversely influence the results of this test.
