12. Report
12.1 A summary sheet for the run must include:
12.1.1 The mass of the dry sample charged, g,
12.1.2 The density of the sample at 15°C, g/mL,
12.1.3 The volume of the sample at 15°C, mL,
12.1.4 The gain or loss in mass and volume to the nearest 0.1 %,
12.1.5 The volume and mass % of each fraction to the nearest 0.1 %,
12.1.6 The cumulative volume and mass percentages, and
12.1.7 The mass of water, if any.
12.2 The gas, debutanized naphtha, and succeeding fractions are listed in order of ascending boiling point with residue recorded last.
12.3 The observations made in 10.3.5, 10.4.7, and 10.5.4 are included as a second sheet, which is normally attached to the summary sheet.
12.4 Make plots of the temperature in degrees Celsius AET as the ordinate (y-axis) versus the percentage mass and volume distilled as the abscissa (x-axis). These are the final TBP distillation curves.
13. Precision and Bias
13.1 The precision of this method as determined by the statistical examination of interlaboratory test results is described as follows.
13.2 Repeatability - The difference between successive results obtained by the same operator with the same apparatus under constant operating conditions on identical test material would, in the long run, in the normal and correct operation of this test method, exceed the values indicated as follows in one case in twenty. (Repeatability is under statistical review.)
13.3 Reproducibility - The difference between two single and independent results obtained by different operators working in different laboratories on identical test material would, in the normal and correct operation of this test method, exceed the values indicated as follows in one case in twenty.
13.4 Bias:
13.4.1 Absolute Bias - Since there is no accepted reference material suitable for determining the bias for the procedure in Test Method D2892 in determining distillation properties of crude petroleum, bias cannot be determined.
13.4.2 Relative Bias - TBP is defined under the conditions of this test method (see 1.2).
NOTE 7 - The crude oil used for this precision statement had a density at 15°C equal to 0.859 and an average slope equal to 6°C per percent distilled.
14. Keywords
14.1 boiling point distillation; crude oil distillation; distillation; fractional distillation; TBP curves