ASTM_D_7154_-_15.pdf

Designation:D715415IP 52812Standard Test Method forFreezing Point of Aviation Fuels(Automatic Fiber OpticalMethod)1This standard is issued under the fixed designation D7154;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.INTRODUCTIONThis test method is nearly identical to Test Method D5901.The difference in this test method is theversion of software(version V.22)that is utilized in the apparatus.This version of software is intendedto better identify samples that are contaminated.Since the algorithm in this version of software isdifferent than previous versions utilized in this apparatus,the subcommittee determined to publish aseparate test method with a different standard designation.1.Scope*1.1 This test method covers the determination of the tem-perature below which solid hydrocarbon crystals may form inaviation turbine fuels.NOTE1This test method describes an alternative procedure andautomatic apparatus which closely mimics the apparatus and proceduredescribed in Test Method D2386.1.2 The measuring range of the apparatus is from 70 C to0 C,however the precision statements were derived only fromsamples with freezing point temperatures from 60 C to42 C.NOTE2Typical aviation fuel has freezing point temperatures in the60 C to 40 C range.1.3 Some results from this test method(14%of samplesincluded in the 2003 round robin2)incorrectly identifiedsample contamination where no contaminants were present inthe samples(see research report2for further information).1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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 and health practices and determine the applica-bility of regulatory limitations prior to use.For specific hazardstatements,see Section 7.2.Referenced Documents2.1 ASTM Standards:3D2386 Test Method for Freezing Point of Aviation FuelsD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD5901 Test Method for Freezing Point of Aviation Fuels(Automated Optical Method)(Withdrawn 2010)4D6708 Practice for Statistical Assessment and Improvementof Expected Agreement Between Two Test Methods thatPurport to Measure the Same Property of a MaterialE1 Specification for ASTM Liquid-in-Glass Thermometers2.2 Energy Institute Standard:IP 16 Determination Freezing Point of Aviation Fuels3.Terminology3.1 Definitions:3.1.1 freezing point,nin aviation fuels,the fuel tempera-ture at which solid hydrocarbon crystals,formed on cooling,1This test method is under the jurisdiction of ASTM CommitteeD02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.07 on Flow Properties.Current edition approved April 1,2015.Published April 2015.Originallyapproved in 2005.Last previous edition approved in 2010 as D7154 05(2010).DOI:10.1520/D7154-15.2Supporting data(2003 Interlaboratory Cooperative Test Program)have beenfiled at ASTM International Headquarters and may be obtained by requestingResearch Report RR:D02-1572.3For 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.4The last approved version of this historical standard is referenced onwww.astm.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 States1 disappear when the temperature of the fuel is allowed to riseunder specified conditions of test.3.2 Definitions of Terms Specific to This Standard:3.2.1 automatic fiber optical method,nthe robotic auto-mation of a manual procedure and apparatus and use of fiberoptics to transmit crystal detection signals to and from thespecimen test chamber.4.Summary of Test Method4.1 After insertion of 25 mL of the test specimen into a testchamber,the test specimen is cooled while being continuouslystirred and monitored by a fiber optical system.The tempera-ture of the specimen is measured with an electronic tempera-ture measuring device.When crystal formation is detected inthe specimen,the temperature is recorded and the specimen inthe test chamber is warmed,while being continuously stirredand monitored by the optical system,until the crystals in thespecimen completely disappear.The temperature of the speci-men when the last crystals disappear is recorded as the freezingpoint(automatic fiber optical method).5.Significance and Use5.1 T