ASTM_E_126_-_13a.pdf

Designation:E12613aStandard Test Method forInspection,Calibration,and Verification of ASTMHydrometers1This standard is issued under the fixed designation E126;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method describes the principles,apparatus,andprocedures for the inspection,calibration,and verification ofASTM glass hydrometers.This test method is applicable toASTM hydrometers and may be used for other generalhydrometers of the constant-mass,variable-displacement type.1.2 The values stated in inch-pound units are to be regardedas the standard.The values given in parentheses are mathemati-cal conversions to SI units that are provided for informationonly and are not considered standard.The metric equivalents ofinch-pound units may be approximate.1.3 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:2D1265 Practice for Sampling Liquefied Petroleum(LP)Gases,Manual MethodD1298 Test Method for Density,Relative Density,or APIGravity of Crude Petroleum and Liquid Petroleum Prod-ucts by Hydrometer MethodD1657 Test Method for Density or Relative Density of LightHydrocarbons by Pressure HydrometerE1 Specification for ASTM Liquid-in-Glass ThermometersE77 Test Method for Inspection and Verification of Ther-mometersE100 Specification for ASTM HydrometersE344 Terminology Relating to Thermometry and Hydrom-etryE2251 Specification for Liquid-in-Glass ASTM Thermom-eters with Low-Hazard Precision Liquids3.Terminology3.1 DefinitionsThe definitions given in Terminology E344apply.3.2 Definitions of Terms Specific to This Standard:3.2.1 API gravity,na relative index of density for petro-leum products developed by the American Petroleum Institute.API gravity is defined as:API Gravity,deg5141.5/rel.density 60/60 F!#2 131.5(1)Values of API gravity are typically expressed in degrees API,that is,39.60 API.3.2.2 comparator,nin this test method,a glass or othertransparent cylinder to contain a liquid in which hydrometersmay be compared.Examples of suitable comparators are givenin Appendix X1.3.2.3 density,nmass of a unit volume of material.3.2.3.1 DiscussionUnits of density in hydrometers includekg/l(kilograms per liter),kg/m3(kilograms per cubic meter),and g/l(grams per liter);each typically expressed as mass pervolume at a specified temperature,that is,kg/m3at 15 C.Asof this writing,only the kg/m3at 15 C scale is offered inASTM hydrometers(see Specification E100).3.2.4 relative density(formerly specific gravity),nratio ofthe mass of a given volume of material at a stated temperatureto the mass of an equal volume of gas-free distilled water at thesame or different temperature.Both reference temperaturesshall be explicitly stated.3.2.4.1 DiscussionCommon reference temperatures in-clude 60 F/60 F,20 C/20 C,20 C/4 C.The historic term,specific gravity,may still be found.3.2.5 specific gravity,nhistoric term,replaced by relativedensity.3.2.6 thermo-hydrometer,nglass hydrometer having athermometer combined with a hydrometer in one instrument.1This test method is under the jurisdiction of ASTM Committee E20 onTemperature Measurement and is the direct responsibility of Subcommittee E20.05on Liquid-in-Glass Thermometers and Hydrometers.Current edition approved Nov.1,2013.Published December 2013.Originallyapproved in 1959.Last previous edition approved in 2013 as E126 13.DOI:10.1520/E0126-13a.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 Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2.7 verification,nconfirmation,by provision of objec-tive evidence,that the instrument fulfills specified require-ments.3.2.7.1 DiscussionIn this test method,if the hydrometerbears an ASTM designation,the requirements for the maxi-mum scale error and dimensions for the hydrometers given inSpecification E100 apply.3.2.8 Other descriptions of terms relating to thermometersare included in Test Method E77.Any definitions of measure-ment uncertainty used in this standard are from TerminologyE3444.Significance and Use4.1 The purpose of this test method is to establish a commonmethod by which manufacturers,calibration laboratories,andusers of hydrometers may inspect,verify,or calibrate them.4.2 The goal is to p