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PAC-Lab Instruments-ASTM D
NOTE 2—The need for a change in calibration is generally attributable to deposits in c5002 sample tube that are not removed by the routine? Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: These checks and any subsequent adjustments to Constants A and B can be made if required, without repeating the calculation procedure.
The sample must appear to be homogeneous. NOTE 4—When viscous liquids are being measured, a stable reading can be achieved even when air or gas bubbles are present.
If stable values are not observed after a few minutes, then astn the injection of a new sample into the tube. The matrix for this bias study was comprised of 15 participants, each analyzing four reference oils with certi?
Carry out all calculations to six signi? Lighter crude oil can require special handling to prevent vapor losses. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Atsm, at the address shown below. Make sure that there is no obvious dd5002 of bubbles trapped in the U-tube, and that it is? Historical Version s – view previous versions of standard. Precise setting and control of the test temperature in the sample tube is extremely important.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Reagents and Materials 7. 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. Lighter crude oil wstm require special handling to prevent vapor losses.
Calibrate the instrument at the same temperature at which the density of the sample is to be measured. Unless otherwise indicated it is intended that all reagents wstm conform to the speci?
Adjust the bath or internal temperature control so that the desired test temperature is established and maintained in the sample compartment of the analyzer. The test specimen is obtained as follows: Turn the illumination light off immediately after inspection of the sample tube, since the heat generated affects the measurement temperature.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Since bubbles contribute to lower density readings, an observed increase in the density of the liquid 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. This test method applies to crude oils with high vapor pressures provided appropriate precautions are taken to prevent vapor loss during transfer of the sample to the density analyzer. Although this condition can be compensated for by adjusting A and B, as described below, it is good practice to clean the tube with warm chromic acid solution Warning—Causes severe burns.
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 The laboratory test container and sample volume shall be of sufficient dimensions to allow mixing as described in 8.
Preparation of Apparatus 9.
ASTM D5002 – 16
The setting chosen would then be dependent upon whether it was approached from a higher or lower value. Link to Active This link will always route to the current Active version of the standard. Calibration of D50022 When bubbles are absent and the sample is at equilibrium with the test temperature, the displayed values are stable, do not drift, and show only small variations of the order of 61 to 2 units in the last signi?
Awtm error of 0. Mixing is required to obtain a homogeneous sample for analysis. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
If the instrument has been calibrated to display the density, adjust the reading to the correct value for water at the test temperature see Table 1 by changing the value of Constant A, commencing with the last decimal place. Work Item s – proposed revisions of this standard.
The instrument shall be capable of meeting the precision requirements described in Test Method D Other calibrating materials such as n-nonane, n-tridecane, cyclohexane, and n-hexadecane for high temperature applications can also be used as appropriate. In cases where saline components can be deposited in the cell,? 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 Record the T-value for air.
This test method applies to crude oils with high vapor pressures provided appropriate precautions are taken to prevent vapor loss during transfer of the sample to the density analyzer.
The accepted units of measurement of density are grams per millilitre and kilograms per cubic metre. A5 [Tw2 2 2 Permission rights to photocopy the standard may also be secured from the ASTM website www.