1、Designation:D38112(Reapproved 2017)Standard 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 n
2、umber 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 the determination of the existe
3、ntgum 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 th
4、e 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
5、 is degrees Celsius.1.4 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
6、 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.1.5
7、 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.For specificwarning s
8、tatements,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 Orga
9、nization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1655 Specification for Aviation Turbine FuelsD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsE1 Specification for ASTM Liquid-in-Glass ThermometersE29 Practice for Using Significant Digi
10、ts 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 of Terms Specific to
11、This Standard:3.1.1 existent gum,nthe evaporation residue of aviationfuels,without any further treatment.3.2 For non-aviation fuels,the following definitions apply.3.3 solvent washed gum content,nthe residue remainingwhen the evaporation residue(see 3.4)has been washed withheptane and the washings d
12、iscarded.3.3.1 DiscussionFor motor gasoline or non-aviationgasoline,solvent washed gum content was previously referredto as existent gum.3.4 unwashed gum content,nthe evaporation residue ofthe product or component under test,without any furthertreatment.4.Summary of Test Method4.1 When testing eithe
13、r aviation or motor gasoline,a 50 mL6 0.5 mL quantity of fuel is evaporated under controlled1This 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 on Stability,Cleanliness and Compat
14、ibility of LiquidFuels.Current edition approved July 1,2017.Published July 2017.Originally approvedin 1934.Last previous edition approved in 2012 as D381 12.DOI:10.1520/D0381-12R17.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.F
15、or 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 Intern
16、ational,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.1 conditions of temperature and flow of air(see Table 1).Whentesting aviation turbine fuel,a 50 mL6
