ASTM D6822-2012a 9959 Standard Test Method for Density Relative Density and API Gravity of Crude Petroleum and Liquid Petroleum Products by Thermohydrometer Method.pdf
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1、Designation: D6822 12aAPI Designation: Manual of Petroleum Measurement Standards (MPMS), Chapter 9.3Standard Test Method forDensity, Relative Density, and API Gravity of CrudePetroleum and Liquid Petroleum Products byThermohydrometer Method1This standard is issued under the fixed designation D6822;
2、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
3、. Scope*1.1 This test method covers the determination, using a glassthermohydrometer in conjunction with a series of calculations,of the density, relative density, or API gravity of crudepetroleum, petroleum products, or mixtures of petroleum andnonpetroleum products normally handled as liquids and
4、havinga Reid vapor pressures of 101.325 kPa (14.696 psi) or less.Values are determined at existing temperatures and corrected to15C or 60F by means of a series of calculations andinternational standard tables.1.2 The initial thermohydrometer readings obtained areuncorrected hydrometer readings and n
5、ot density measure-ments. Readings are measured on a thermohydrometer at eitherthe reference temperature or at another convenient tempera-ture, and readings are corrected for the meniscus effect, thethermal glass expansion effect, alternate calibration tempera-ture effects and to the reference tempe
6、rature by means ofcalculations and Adjunct to D1250, Guide for Use of thePetroleum Measurement Tables (API MPMS Chapter 11.1).1.3 Readings determined as density, relative density, or APIgravity can be converted to equivalent values in the other unitsor alternate reference temperatures by means of In
7、terconver-sion Procedures or Adjunct to D1250, Guide for Use of thePetroleum Measurement Tables (API MPMS Chapter 11.1), orboth, or tables as applicable.1.4 The initial thermohydrometer reading shall be recordedbefore performing any calculations. The calculations requiredin Section 9 shall be applie
8、d to the initial thermohydrometerreading with observations and results reported as required bySection 11 prior to use in a subsequent calculation procedure(measurement ticket calculation, meter factor calculation, orbase prover volume determination).1.5 Annex A1 contains a procedure for verifying or
9、 certify-ing the equipment of this test method.1.6 The values stated in SI units are to be regarded asstandard. The values given in parentheses are for informationonly.1.7 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of
10、 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:2D1250 Guide for Use of the Petroleum Measurement TablesD1298 Test Method for Density, Relative Density (
11、SpecificGravity), or API Gravity of Crude Petroleum and LiquidPetroleum Products by Hydrometer Method (API MPMSChapter 9.1)D4057 Practice for Manual Sampling of Petroleum andPetroleum Products (API MPMS Chapter 8.1)D4177 Practice for Automatic Sampling of Petroleum andPetroleum Products (API MPMS Ch
12、apter 8.2)D5854 Practice for Mixing and Handling of Liquid Samplesof Petroleum and Petroleum Products (API MPMS Chapter8.3)D6300 Practice for Determination of Precision and BiasData for Use in Test Methods for Petroleum Products andLubricantsE100 Specification for ASTM Hydrometers2.2 API Standards:3
13、MPMS Chapter 8.1 Practice for Manual Sampling of Petro-leum and Petroleum ProductsMPMS Chapter 8.2 Practice for Automatic Sampling ofPetroleum and Petroleum ProductsMPMS Chapter 8.3 Practice for Mixing and Handling ofLiquid Samples of Petroleum and Petroleum Products(ASTM Practice D5854)1This test m
14、ethod is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and the API Committee on Petroleum Measure-ment, and is the direct responsibility of Subcommittee D02.02.09 on DensityDetermination (API MPMS Chapter 9.0).Current edition approved May 15, 2012. Published Octobe
15、r 2012. Originallyapproved in 2002. Last previous edition approved in 2012 as D6822-12. DOI:10.1520/D6822-12A.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 st
16、andards Document Summary page onthe ASTM website.3Available from American Petroleum Institute (API), 1220 L. St., NW, Wash-ington, DC 20005-4070, www.api.org.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Cons
17、hohocken, PA 19428-2959, United States.MPMS Chapter 9.1 Hydrometer Test Method for Density,Relative Density (Specific Gravity) or API Gravity ofCrude Petroleum and Liquid Petroleum Products (ASTMTest Method D1298)MPMS Chapter 11.12004, including Addendum12007 Temperature and Pressure Volume Correcti
18、onFactors for Generalized Crude Oils, Refined Products, andLubricating Oils2.3 ASTM Adjuncts:Adjunct to D1250, Guide for Use of the Petroleum Measure-ment Tables (API MPMS Chapter 11.1)43. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 API gravity (API), na special function of r
19、elativedensity 60/60F, represented by:API 5 141.5 / relative density 60/60F!# 2 131.5 (1)3.1.1.1 DiscussionNo statement of reference temperatureis required, as 60F is included in the definition.3.1.2 density, nthe mass of liquid per unit volume at 15Cand 101.325 kPa with the standard unit of measure
20、ment beingkilograms per cubic metre (kg/m3).3.1.2.1 DiscussionOther reference temperatures, such as20C, may be used for some products or in some locations.Less preferred units of measurement, for example, kg/L org/mL, are still in use.3.1.3 observed values, nhydrometer readings observed ata temperat
21、ure other than the defined reference temperature.3.1.3.1 DiscussionThese values are only hydrometerreadings and not density, relative density, or API gravity at thetemperature.3.1.4 relative density, nthe ratio of the mass of a givenvolume of liquid at a specific temperature to the mass of anequal v
22、olume of pure water at the same or different tempera-ture. Both reference temperatures shall be explicitly stated.3.1.4.1 DiscussionCommon reference temperatures in-clude 15/15C, 60/60F, 20/20C, and 20/4C. The historicterm specific gravity may still be found.3.1.5 thermohydrometer, na glass hydromet
23、er with aself-contained thermometer.4. Summary of Test Method4.1 The density or API gravity, after temperature equilib-rium has been reached, is read by observing the freely floatingthermohydrometer and noting the graduation nearest to theapparent intersection of the horizontal plane surface of thel
24、iquid with the vertical scale of the hydrometer after tempera-ture equilibrium has been reached. The observed thermohy-drometer reading is reduced to the reference temperature valueby means of the Petroleum Measurement Tables (the appropri-ate adjunct to Guide D1250/API MPMS Chapter 11.1) andobserve
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