ASTM_D_2112_-_01a_2007.pdf

Designation:D211201a(Reapproved 2007)Standard Test Method forOxidation Stability of Inhibited Mineral Insulating Oil byPressure Vessel1This standard is issued under the fixed designation D2112;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()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method covers and is intended as a rapidmethod for the evaluation of the oxidation stability of newmineral insulating oils containing a synthetic oxidation inhibi-tor.This test is considered of value in checking the oxidationstability of new mineral insulating oils containing 2,6-ditertiary-butyl para-cresol or 2,6-ditertiary-butyl phenol,orboth,in order to control the continuity of this property fromshipment to shipment.The applicability of this procedure foruse with inhibited mineral insulating oils of more than 12 cStat 40C(approximately 65 SUS at 100F)has not beenestablished.1.2 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility 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.(See warning in6.7.)NOTE1A modification of this test method,which uses the sameprocedure and apparatus but a higher(150C)bath temperature,has beenpublished as Test Method D2272.2.Referenced Documents2.1 ASTM Standards:2B1 Specification for Hard-Drawn Copper WireD2272 Test Method for Oxidation Stability of Steam Tur-bine Oils by Rotating Pressure VesselE1 Specification for ASTM Liquid-in-Glass Thermometers3.Summary of Test Method3.1 The test specimen is agitated by rotating axially at 100rpm at an angle of 30 from the horizontal,under an initialoxygen pressure of 90 psi(620 kPa),in a stainless steel orcopper vessel(for rapid temperature equilibrium),with a glasstest specimen container and copper catalyst coil,in the pres-ence of water,at a bath temperature of 140C.The time for anoil to react with a given volume of oxygen is measured;completion of the test is indicated by a specific drop inpressure.4.Signifance and Use4.1 This is a control test of oxidation stability of new,inhibited mineral insulating oils for determining the inductionperiod of oxidation inhibitors under prescribed acceleratedaging conditions.There is no proven correlation between oilperformance in this test and performance in service.However,the test method may be used to check the continuity ofoxidation stability of production oils.5.Apparatus5.1 Oxidation Vessel Glass test specimen container withcover and catalyst coil,pressure gage,thermometer,test bath,and accessories as described in Annex A1.The assembledapparatus is shown in Fig.1,and its design shown schemati-cally in Fig.2.6.Reagents and Materials6.1 Purity of ReagentsUse reagent grade chemicals in alltests.Unless otherwise indicated,all reagents shall conform tothe specifications of the Committee on Analytical Reagents ofthe American Chemical Society,where such specifications areavailable.36.2 Hydrochloric Acid,10 vol%.6.3 Silicon Carbide Abrasive Cloth,100-grit with clothbacking.6.4 Acetone,cp.1This test method is under the jurisdiction of ASTM Committee D27 onElectrical Insulating Liquids and Gases and is the direct responsibility of Subcom-mittee D27.06 on Chemical Test.Current edition approved July 15,2007.Published August 2007.Originallyapproved in 1962.Last previous edition approved in 2001 as D211201a.DOI:10.1520/D2112-01AR07.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Reagent Chemicals,American Chemical Society Specifications,AmericanChemical Society,Washington,DC.For Suggestions on the testing of reagents notlisted by the American Chemical Society,see Annual Standards for LaboratoryChemicals,BDH Ltd.,Poole,Dorset,U.K.,and the United States Pharmacopeiaand National Formulary,U.S.Pharmacopeial Convention,Inc.(USPC),Rockville,MD.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.5 2-Propanol,99 vol%,refined.6.6 Liquid Detergent.6.7 Oxygen,99.5%,with pressure regulation above 90 psi(620 kPa).(Warning Oxygen vigorously accelerates com-bustion).6.8 Potassium Hydroxide,Alcohol Solution(1 mass%)Dissolve 7.93 g of potassium hydroxide(KOH)pellets in 1 Lof 99%refined 2-propanol.6.9 Silicone Stopcock Grease.6.10 Wire Catalyst AWG No.14(0.0641-in.(1.628-mm)diameter)electrolytic copper wire 99.9%purity,conformingto Specification B1.Soft-drawn copper wire of an equivalentgrade may also be used.7.Hazards7.1 Co