ASTM_D_381_-_22.pdf

Designation:D38122Standard Test Method forGum Content in Fuels by Jet Evaporation1This standard is issued under the fixed designation D381;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 existentgum content of aviation fuels,and the gum content of motorgasolines or other volatile distillates in their finished form,(including those containing alcohol and ether type oxygenatesand deposit control additivessee Note 7 for additionalinformation)at the time of test.1.2 Provisions are made for the determination of the heptaneinsoluble portion of the residue of non-aviation fuels.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 The accepted SI unit of pressure is the Pascal(Pa);theaccepted SI unit for temperature is degrees Celsius.1.4 WARNINGMercury has been designated by manyregulatory agencies as a hazardous substance that can causeserious medical issues.Mercury,or its vapor,has been dem-onstrated to be hazardous to health and corrosive to materials.Use caution when handling mercury and mercury-containingproducts.See the applicable product Safety Data Sheet(SDS)for additional information.The potential exists that sellingmercury or mercury-containing products,or both,is prohibitedby local or national law.Users must determine legality of salesin their location.1.5 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.For specific warning statements,see 6.4,7.4,and 9.1.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1655 Specification for Aviation Turbine FuelsD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4175 Terminology Relating to Petroleum Products,LiquidFuels,and LubricantsE1 Specification for ASTM Liquid-in-Glass ThermometersE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications2.2 Energy Institute Standard:3IP Standard Methods for Analysis and Testing of PetroleumProductsIP 540 Determination of the existent gum content of aviationturbine fuel jet evaporation method3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method,referto Terminology D4175.3.2 Definitions of Terms Specific to This Standard:3.2.1 existent gum,nthe evaporation residue of aviationfuels,without any further treatment.3.2.2 solvent washed gum content,nthe residue remainingwhen the evaporation residue(see 3.2.3)has been washed withheptane and the washings discarded.3.2.2.1 DiscussionFor motor gasoline or non-aviationgasoline,solvent washed gum content was previously referredto as existent gum.3.2.3 unwashed gum content,nthe evaporation residue ofthe product or component under test,without any furthertreatment.1This 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,Cleanliness and Compatibility of Liquid Fuels.Current edition approved April 1,2022.Published May 2022.Originallyapproved in 1934.Last previous edition approved in 2019 as D381 19.DOI:10.1520/D0381-22.2For 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.3Available from Energy Institute,61 New Cavendish St.,London,W1G 7AR,U.K.,http:/www.energyinst.org.*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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.14.Summary of Test Method4.1 When testing either aviation or motor gasoline,a 50 mL6 0.5 mL quantity of fuel is evaporated under controlledconditions of tempe