ASTM_D_7873_-_13e1.pdf

Designation:D7873131Standard Test Method forDetermination of Oxidation Stability and InsolublesFormation of Inhibited Turbine Oils at 120 C Without theInclusion of Water(Dry TOST Method)1This standard is issued under the fixed designation D7873;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.1NOTESection 3 was corrected editorially in May 2014.1.Scope1.1 This test method is used to evaluate the sludgingtendencies of steam and gas turbine lubricants during theoxidation process in the presence of oxygen and metal catalyst(copper and iron)at an elevated temperature.This test methodmay be used to evaluate industrial oils(for example,circulat-ing oils and so forth).1.2 This test method is a modification of Test MethodD4310 where the sludging and corrosion tendencies of thesame kinds of oils are determined after 1000 h at 95 C in thepresence of water.Water is omitted in this modification.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3.1 ExceptionThe values in parentheses in some of thefigures are provided for information only for those using oldequipment based on non-SI units.1.4 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.1.5 WARNINGMercury has been designated by manyregulatory agencies as a hazardous material that can causecentral nervous system,kidney and liver damage.Mercury,orits vapor,may be hazardous to health and corrosive tomaterials.Caution should be taken when handling mercury andmercury containing products.See the applicable product Ma-terial Safety Data Sheet(MSDS)for details and EPAswebsitehttp:/www.epa.gov/mercury/faq.htmfor addi-tional information.Users should be aware that selling mercuryand/or mercury containing products into your state or countrymay be prohibited by law.2.Referenced Documents2.1 ASTM Standards:2A510M Specification for General Requirements for WireRods and Coarse Round Wire,Carbon Steel(Metric)(Withdrawn 2011)3B1 Specification for Hard-Drawn Copper WireD943 Test Method for Oxidation Characteristics of InhibitedMineral OilsD1193 Specification for Reagent WaterD2272 Test Method for Oxidation Stability of Steam Tur-bine Oils by Rotating Pressure VesselD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4310 Test Method for Determination of Sludging andCorrosion Tendencies of Inhibited Mineral OilsE1 Specification for ASTM Liquid-in-Glass ThermometersE230 Specification and Temperature-Electromotive Force(EMF)Tables for Standardized Thermocouples2.2 Other Standards:Specification for IP Standard Thermometers4ISO3696 WaterforAnalyticalLaboratoryUseSpecification and Test Methods53.Terminology3.1 Definitions:3.1.1 sludge,na precipitate or sediment from oxidizedmineral oil that is insoluble in n-heptane.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.09.0C on Oxidation of Turbine Oils.Current edition approved Dec.1,2013.Published January 2014.DOI:10.1520/D7873-13E01.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from Energy Institute,61 New Cavendish St.,London,WIG 7AR,U.K.,http:/www.energyinst.org.5Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.Summary of Test Method4.1 Atotal of six to eight tubes containing 360 mLof sampleeach are heated at 120 C with oxygen in the presence of aniron-copper catalyst.Each tube is removed over time and thesample is analyzed by Test Method D2272 and the insolublesare measured until the RPVOT residual ratio reaches below25%or an agreed-upon percentage or specified time.Test runfor a specified time(s)may be run using a single tube or asmany as specified by the requestor.The mass of insolublematerial of each oil sample is determined gravimetrically byfiltration of a 100 g oil sample through a membrane filter withpore size 1 m.The insoluble mass(mg/kg oil)is plottedagainst RPVOT residual ratio.The insoluble mass in milli-grams per kilogram oil at 25%or an agreed-upon RPVOTresidual ratio or specified time is reported.5.S