1、Designation:D787213(Reapproved 2018)An American National StandardStandard Test Method forDetermining the Concentration of Pipeline Drag ReducerAdditive in Aviation Turbine Fuels1This standard is issued under the fixed designation D7872;the number immediately following the designation indicates the y
2、ear 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.1.Scope1.1 This test method covers the measurement of highmolecular wei
3、ght polymers,in particular pipeline drag reduceradditive(DRA),in aviation turbine fuels with a 72 g L lowerdetection limit.The method cannot differentiate between dif-ferent polymers types.Thus,any non-DRA high molecularweight polymer will cause a positive measurement bias.Further investigation is r
4、equired to confirm the polymerdetected is DRA.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 designated by many regu-latory agencies as a hazardous substance that can cause seriousmedical issues.M
5、ercury,or its vapor,has been demonstrated tobe hazardous to health and corrosive to materials.Use Cautionwhen handling mercury and mercury-containing products.Seethe applicable product Safety Data Sheet(SDS)for additionalinformation.The potential exists that selling mercury ormercury-containing prod
6、ucts,or both,is prohibited by local ornational law.Users must determine legality of sales in theirlocation.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,heal
7、th,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of Internati
8、onal Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4177 Practice for Automatic Sampling of Petroleum andPetroleum Pr
9、oducts2.2 Other Reference:CRC Report No.642 Investigation of Pipeline Drag Reduc-ers in Aviation Turbine Fuels3.Terminology3.1 Definitions:3.1.1 bumping,vviolent boiling which displaces liquidinto the distillation flask.3.1.2 drag reducing additive(DRA),na material com-prised of very high molecular
10、weight hydrocarbon polymersthat is soluble in petroleum products and used to reduce thefluid friction during pipeline transportation.3.1.3 rotary evaporation,na distillation process utilizingheat,reduced pressure and a rotating flask which evaporatesfluid to reduce the volume of a sample of material
11、.3.1.3.1 DiscussionThe apparatus,consisting of a round-bottomed flask in a heated bath,is operated under vacuum(reduced pressure)to lower the boiling point of the fluid,andthe rotational motion accelerates evaporation of the liquid bycreating additional surface area of the fluid being distilled off.
12、3.1.4 sheared DRA,nthe very long hydrocarbon polymersof drag reducing agent that have been shortened by severephysical processes such that the resulting material is no longereffective at reducing fluid friction.3.1.4.1 DiscussionSevere physical and mechanical pro-cesses include large pressure change
13、s which can occur atcontrol valves,pumps,meters,reductions in pipe diameterwhich affect fluid velocity,and ultrasonication in a laboratoryprocess,resulting in shorter polymeric chains which are stillvery large compared to the fuel molecules and are non-distillable.1This test method is under the juri
14、sdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.J0.01 on Jet Fuel Specifications.Current edition approved Oct.1,2018.Published November 2018.Originallyapproved in 2013.Last previous edition approved in 2013 as D7872
15、13.DOI:10.1520/D7872-13R18.2For 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.Copyright ASTM International,100 Barr H
16、arbor 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 3.1.5 total exclusion,npolymers larger than the pore sizecannot enter the pores and elute together as the first pea
