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NOTE 3—In applying this periodic calibration procedure, d5002 has been found that more than one value each for A and B, differing in the fourth decimal place, will yield the correct reading for the density of air and water. Reagents and Materials 7.
Calibrate the instrument at the same temperature at which the density of the sample qstm to be measured. Mixing at room temperature in an open container can result in the loss of light ends, so mixing in closed, pressurized containers or at sub-ambient temperatures is recommended.
These checks and any subsequent adjustments to Constants A and B can be made if required, without repeating the calculation procedure.
No other units of measurement are included in this standard. Calibration of Apparatus Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. The instrument shall be capable of meeting the precision requirements described in Test Method D Chromic acid solution is the most effective cleaning agent; however, surfactant-type cleaning?
If the display does not exhibit the correct T-value or density for air at the temperature of test, repeat the cleaning procedure or adjust the value of Constant B commencing with the last decimal place until the correct density is displayed.
ASTM D5002 – 16
Sampling, Test Specimens, and Test Units 8. Thereafter, conduct calibration checks at least weekly during routine operation or more frequently as may be dictated by the nature of the crude oils being measured see No other units of measurement are included in this standard. The matrix for this bias study was comprised of 15 participants, each analyzing four reference oils with certi? If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.
Unless otherwise indicated it is intended that all reagents shall conform to the speci? Current edition approved Sept. Historical Version s – view previous versions of standard. Lighter crude oil can require special handling to prevent vapor losses.
The sample must appear to be homogeneous. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
The last approved version of this historical standard is referenced on www. A number in parentheses indicates the year of last reapproval. Originally approved in Lighter crude oil can require special handling to prevent vapor losses.
Mixing is required to obtain a homogeneous sample for analysis. Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: Heavier crudes can require measurements at higher temperatures to eliminate air bubbles in the sample.
The sample tube shall be completely full. The analyzer must accommodate the accurate measurement of the 1 This test method is under the jurisdiction of ASTM Committee D02 on Petroleum Products and Lubricants and is the direct responsibility of Subcommittee D Individual reprints wstm or multiple copies of this standard d0502 be obtained by contacting ASTM at the above address or at phonefaxor service astm. If stable values are not observed after a few minutes, then repeat the injection of a new sample into the tube.
PAC-Lab Instruments-ASTM D
Allow the water to reach astn equilibrium at the test temperature and record the T-value for water and the test temperature. Turn the illumination light off immediately after inspection of the sample tube, since the heat generated affects the measurement temperature.
Carry out all calculations to six signi? Since bubbles contribute to lower density readings, an observed increase in the density of the astn after injection of fresh sample tends to suggest that bubbles were previously present.
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Alternatively, use the T and d values for the other reference liquid if one is used. Precision and Bias 5,6