ASTMD2112-01a

Designation:D 2112-01aStandard Test Method forOxidation Stability of Inhibited Mineral Insulating Oil byPressure Vessel1This standard is issued under the fixed designation D 2112;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicatesn editorial change since the last revisionor reapproval.This standard has been approved for use by agencies of the Depar ment of Defense.1.Scope1.1 This test method is intended as a rapid method for theevaluation of the oxidation stability of new mineral insulatingoils containing a synthetic oxidation inhibitor.This test isconsidered of value in checking the oxidation stability of newmineral insulating oils containing 2,6-ditertiary-butyl para-cresol or 2,6-ditertiary-butyl phenol,or both,in order to controlthe continuity of this property from shipment to shipment.Theapplicability of this procedure for use with inhibited mineralinsulating oils of more than 12 cSt at 40C (approximately 65SUS at 100F)has not been established.1.2 This standard does not purport to address all of thesafety concerns,if any:associated with its use.It is theresponsibility of whoever uses this standard to consult andestablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use.(See6.7).FIG.1 Rotating Vessel Oxidation Test ApparatusNom 1-A modifi cation of this test method,which uses the sameence of water,at a bath temperature of 140C.The time for anprocedure and apparatus but a higher (150C)bath temperature,has beenpublished as Test Method D2272.oil to react with a given volume of oxygen is measured;completion of the test is indicated by a specific drop in2.Referenced Documentspressure.2.1 ASTM Standards:4.Signifance and UseB 1 Specifi cation for Hard-Drawn Copper Wire2D 2272 Test Method for Oxidation Stability of Steam4.1 This is a control test of oxidation stability of new.Turbine Oils by Rotating Pressure Vessel3inhibited mineral insulating oils for detemmining the inductionE 1 Specifi cation for ASTM Themmometersperiod of oxidation inhibitors under prescribed acceleratedaging conditions.There is no proven correlation between oil3.Summary of Test Methodperformance in this test and performance in service.However,3.1 The test specimen is agitated by rotating axially at 100the test method may be used to check the continuity ofrpm at an angle of 30 from the horizontal,under an initialoxidation stability of production oils.oxygen pressure of 90 psi (620 kPa),in a stainless steel or5.Apparatuscopper vessel (for rapid temperature equilibrium),with a glasstest specimen container and copper catalyst coil,in the pres-5.1 Oxidation Vessel-Glass test specimen container withcover and catalyst coil,pressure gage,thermometer,test bath,and accessories as described in Annex A1.The assembledThis test method is under the ju