1、Designation:D18906(Reapproved 2019)British Standard 4380Standard Test Method forConradson Carbon Residue of Petroleum Products1This standard is issued under the fixed designation D189;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,t
2、he 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 the
3、 determination of the amountof carbon residue(Note 1)left after evaporation and pyrolysisof an oil,and is intended to provide some indication of relativecoke-forming propensities.This test method is generally ap-plicable to relatively nonvolatile petroleum products whichpartially decompose on distil
4、lation at atmospheric pressure.Petroleum products containing ash-forming constituents asdetermined by Test Method D482 or IP Method 4 will have anerroneously high carbon residue,depending upon the amountof ash formed(Note 2 and Note 4).NOTE1The term carbon residue is used throughout this test method
5、to designate the carbonaceous residue formed after evaporation andpyrolysis of a petroleum product under the conditions specified in this testmethod.The residue is not composed entirely of carbon,but is a cokewhich can be further changed by pyrolysis.The term carbon residue iscontinued in this test
6、method only in deference to its wide common usage.NOTE2Values obtained by this test method are not numerically thesame as those obtained by Test Method D524.Approximate correlationshave been derived(see Fig.X1.1),but need not apply to all materialswhich can be tested because the carbon residue test
7、is applied to a widevariety of petroleum products.NOTE3The test results are equivalent to Test Method D4530,(seeFig.X1.2).NOTE4In diesel fuel,the presence of alkyl nitrates such as amylnitrate,hexyl nitrate,or octyl nitrate causes a higher residue value thanobserved in untreated fuel,which can lead
8、to erroneous conclusions as tothe coke forming propensity of the fuel.The presence of alkyl nitrate inthe fuel can be detected by Test Method D4046.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 WARNINGMercury has been d
9、esignated 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 M
10、a-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
11、 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.1.5 This international standard was developed in accor-d
12、ance 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 Stand
13、ards:2D482 Test Method for Ash from Petroleum ProductsD524 Test Method for Ramsbottom Carbon Residue ofPetroleum ProductsD4046 Test Method for Alkyl Nitrate in Diesel Fuels bySpectrophotometry(Withdrawn 2019)3D4057 Practice for Manual Sampling of Petroleum andPetroleum Products1This test method is u
14、nder the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.06 on Analysis of Liquid Fuels and Lubricants.Current edition approved Dec.1,2019.Published December 2019.Originallyapproved in 1924.Last previous edition
15、approved in 2014 as D189 06(2014).DOI:10.1520/D0189-06R19.In the IP,this test method is under the jurisdiction of the StandardizationCommittee and is issued under the fixed designation IP 13.The final numberindicates the year of last revision.This test method was adopted as a jointASTMIPstandard in
16、1964.This procedure is a modification of the original Conradson method and apparatusfor Carbon Test and Ash Residue in Petroleum Lubricating Oils.See Proceedings,Eighth International Congress of Applied Chemistry,New York,Vol 1,p.131,September 1912;also Journal of Industrial and Engineering Chemistry,IECHA,Vol 4,No.11,December 1912.In 1965,a new Fig.2 on reproducibility and repeatability combining ASTM andIP precision data replaced old Fig.2 and Note 4.2For referenced ASTM standards,visit the AS
