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ASTM D6822

This test method covers the determination, using a glass thermohydrometer in conjunction with a series of calculations, of the density, relative density, or API gravity of crude petroleum, petroleum products, or mixtures of petroleum and nonpetroleum products normally handled as liquids and having a Reid vapor pressures of 101.325 kPa (14.696 psi) or less.

The method offers simple measurement and direct temperature measurement. It is faster than the pycnometer method. The advantage over ASTM D1298 is that it not uses a separate thermometer.

Applications are crude oil tank measurements, refinery process control, custody transfer, pipeline quality verification or marine terminal operation.

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  1. Tamson D1298 Manual density
    ASTM D6822 density apparatus
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General:
The method helps ensure that engine oils from different manufacturers can be mixed without causing phase separation or loss of performance.
Precision:
No information is presented about either the precision or bias of Test Method D6922 for measuring homogeneity and miscibility since the test results are nonquantitative.
Test:
Visual color determinations and observations are made on an undiluted test oil specimen. The pour point is then determined for the undiluted test oil specimen and the six blends. The undiluted test oil specimen and six blends are then allowed to warm to room temperature. Color determinations and observations are again made on the test oil specimen. The oil is heated to 232 °C, then allowed to cool to room temperature, and then stored at pour point temperatures for 18 h to 24 h. The sample is allowed to thaw and color determinations and observations are made at room temperature.