ASTM_D_5002_-_13.pdf

Designation:D500213Standard Test Method forDensity and Relative Density of Crude Oils by DigitalDensity Analyzer1This standard is issued under the fixed designation D5002;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.1.Scope*1.1 This test method covers the determination of the densityor relative density of crude oils that can be handled in a normalfashion as liquids at test temperatures between 15 and 35C.This test method applies to crude oils with high vapor pressuresprovided appropriate precautions are taken to prevent vaporloss during transfer of the sample to the density analyzer.1.2 This test method was evaluated in round robin testingusing crude oils in the 0.75 to 0.95 g/mL range.Lighter crudeoil can require special handling to prevent vapor losses.Heavier crudes can require measurements at higher tempera-tures to eliminate air bubbles in the sample.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.The accepted units of measurement of density aregrams per millilitre and kilograms per cubic metre.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.Specific warningstatements are given in 7.4,7.5,and 7.6.2.Referenced Documents2.1 ASTM Standards:2D941 Test Method for Density and Relative Density(Spe-cific Gravity)of Liquids by Lipkin Bicapillary Pycnom-eter(Withdrawn 1993)3D1193 Specification for Reagent WaterD1217 Test Method for Density and Relative Density(Spe-cific Gravity)of Liquids by Bingham PycnometerD1250 Guide for Use of the Petroleum Measurement TablesD4052 Test Method for Density,Relative Density,and APIGravity of Liquids by Digital Density MeterD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD4377 Test Method for Water in Crude Oils by Potentiomet-ric Karl Fischer Titration3.Terminology3.1 Definitions:3.1.1 densitymass per unit volume at a specified tempera-ture.3.1.2 relative densitythe ratio of the density of a materialat a stated temperature to the density of water at a statedtemperature.4.Summary of Test Method4.1 Approximately 1 mL to 2 mL of crude oil sample isintroduced into an oscillating sample tube and the change inoscillating frequency caused by the change in the mass of thetube is used in conjunction with calibration data to determinethe density of the sample.5.Significance and Use5.1 Density is a fundamental physical property that can beused in conjunction with other properties to characterize thequality of crude oils.5.2 The density or relative density of crude oils is used forthe conversion of measured volumes to volumes at the standardtemperatures of 15C or 60F and for the conversion of crudemass measurements into volume units.5.3 The application of the density result obtained from thistest method,for fiscal or custody transfer accountingcalculations,can require measurements of the water andsediment contents obtained on similar specimens of the crudeoil parcel.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.04.0D on Physical and Chemical Methods.Current edition approved Oct.1,2013.Published October 2013.Originallyapproved in 1989.Last previous edition approved in 2010 as D5002 99(2010).DOI:10.1520/D5002-13.2For 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.*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 6.Apparatus6.1 Digital Density AnalyzerA digital analyzer consistingof a U-shaped,oscillating sample tube and a system forelectronic excitation,frequency counting,and display.Theanalyzer must accommodate the accurate measurement of thesample temperature during measurement or must control thesample temperature as described in 6.2 and 6.5.The instrumentshall be capable of meeting the precision requirements de-scribed in Test Method D4052.6.2 Circulating Constant-Temperature Bath,capable ofmaintaining the temperature of the circulating liquid constantto 60.05C in the desired range.Temperature control can bemaintained as part of the density analyz