ASTM_D_525_-_12a.pdf

Designation:D52512aBritish Standard 4347Designation:40/97Standard Test Method forOxidation Stability of Gasoline(Induction Period Method)1This standard is issued under the fixed designation D525;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.Scope*1.1 This test method covers the determination of the stabil-ity of gasoline in finished form only,under accelerated oxida-tion conditions.(WarningThis test method2is not intendedfor determining the stability of gasoline components,particu-larly those with a high percentage of low boiling unsaturatedcompounds,as these may cause explosive conditions withinthe apparatus.However,because of the unknown nature ofcertain samples,the pressure vessel assembly shall include asafety burst-disc in order to safeguard the operator.)NOTE1For measurement of oxidation stability of gasoline bymeasurement of potential gum,refer to Test Method D873,or IP TestMethod 138.NOTE2The precision data were developed with gasolines derivedfrom hydrocarbon sources only without oxygenates.1.2 The accepted SI unit of pressure is the kilo Pascal(kPa),and of temperature is C.1.3 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.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.2.Referenced Documents2.1 ASTM Standards:3D873 Test Method for Oxidation Stability of Aviation Fuels(Potential Residue Method)D4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsE1 Specification for ASTM Liquid-in-Glass Thermometers2.2 Energy Institute Standards:4IP-138 Test Method for Oxidation Stability,Aviation Gaso-linePart IV Petroleum and its Products53.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 break point,nthe point in the pressure-time curvethat is preceded by a pressure drop of exactly 14 kPa within 15min and succeeded by a drop of not less than 14 kPa in 15 min.3.1.2 induction period,nthe time elapsed between theplacing of the pressure vessel in the bath and the break point at100C.4.Summary of Test Method4.1 The sample is oxidized in a pressure vessel initiallyfilled at 15 to 25C with oxygen pressure at 690 to 705 kPa andheated at a temperature between 98 and 102C.The pressure isrecorded continuously or read at stated intervals until thebreakpoint is reached.The time required for the sample toreach this point is the observed induction period at thetemperature of test,from which the induction period at 100C1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.14 on Stability and Cleanliness of Liquid Fuels.This test method has been approved by the sponsoring committees and acceptedby the Cooperating Societies in accordance with established procedures.Current edition approved Sept.1,2012.Published November 2012.Originallyapproved in 1939.Last previous edition approved in 2012 as D52512.DOI:10.1520/D0525-12A.2Further information can be found in the June 1978,January 1979,and June1986 editions of the Institute of Petroleum Review.3For 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.4Available from Energy Institute,61 New Cavendish St.,London WIM,8ARU.K.5Aconvenient template for measuring the breakpoint is described in the paper byKorb,E.L.,“Induction Period Calculator,”ASTM Bulletin,No.153,August 1948,pp.99102.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 can be calculated.(WarningIn addition to other precautions,to provide protection against the possibility of explosiverupture of the pressure vessel,the pressure vessel should beoperated behind an appropriate safety shield.)5.Significance and Use