ASTM_E_1260_-_03_2015.pdf

Designation:E126003(Reapproved 2015)Standard Test Method forDetermining Liquid Drop Size Characteristics in a SprayUsing Optical Nonimaging Light-Scattering Instruments1This standard is issued under the fixed designation E1260;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 standard is one of several describing a different class of test methods for determining liquiddrop size characteristics in a spray.These test methods can be broadly distinguished as“optical”or“non-optical.”In the optical category there are test methods that essentially make images(such asphotographs)of drops that can be measured either manually or automatically,and test methods thatdo not make images but use optical phenomena exhibited by single drops or ensembles of drops whichcan be recorded and used to calculate either individual drop sizes or the distribution of drop sizes inan ensemble.This test method deals with the latter class,and hence,is described as“nonimaging.”Thevarious optical phenomena involved are commonly described as“light-scattering.”Using any of thesetest methods,the spray is observed for a period of time during which a large number of drops isexamined,and the data are treated so as to derive drop-size statistics for the sample investigated.1.Scope1.1 The purpose of this test method is to obtain data whichcharacterize the sizes of liquid particles or drops such as areproduced by a spray nozzle or similar device under specifiedconditions using a specified liquid.The drops will generally bein the size range from 5-m to the order of 1 000-m diameter;they will occur in sprays which may be as small as a few cubiccentimetres or as large as several cubic metres.Typically thenumber density of the particles can vary significantly from onepoint to another.1.2 This test method is intended primarily for use instandardizing measurements of the performance of spraypro-ducing devices.It is limited to those techniques and instru-ments that operate by passing a beam of light through the sprayand analyzing the light scattered by the droplets to derive sizeinformation.Such techniques do not produce images of indi-vidual drops,and therefore,are known as“optical(nonimag-ing)instruments.”1.3 The measurements made,when referred to the entirespray being sampled,may be flux sensitive or spatial,asdefined in Practice E799,depending on the techniques usedwith a particular instrument.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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE456 Terminology Relating to Quality and StatisticsE799 Practice for Determining Data Criteria and Processingfor Liquid Drop Size AnalysisE1088 Definitions of Terms Relating to Atomizing Devices(Withdrawn 1997)3E1296 Terminology for Liquid Particle Statistics(With-drawn 1997)3E1620 Terminology Relating to Liquid Particles and Atomi-zation2.2 NFPA Standards:NFPA 30 Flammable and Combustible Liquids Code41This test method is under the jurisdiction of ASTM Committee E29 on Particleand Spray Characterization and is the direct responsibility of Subcommittee E29.02on Non-Sieving Methods.Current edition approved March 1,2015.Published March 2015.Originallyapproved in 1988.Last previous edition approved in 2009 as E1260 03(2009).DOI:10.1520/E1260-03R15.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from National Fire Protection Association(NFPA),1 BatterymarchPark,Quincy,MA 02169-7471,http:/www.nfpa.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 NFPA 33 Spray Application Using Flammable and Combus-tible Materials43.Terminology3.1 DefinitionsFor terminology pertaining to this testmethod,refer to Terminology E456,Practice E799,DefinitionsE1088,and Terminology E1296.3.2 Definitions of Terms Specific to This Standard:3.2.1 spraythe term“spray”in this test method includesall ensembles,arrays,or clouds composed of liquid particles ordrops whether produced artificially or naturally.Although it isusual to consider a spray as implying significant motion of thedrops relative to the atmosphere there are situations in whichthe relative velocity is or becomes sufficiently low to benegligible.In thi