11. Report
11.1 A summary sheet for the run must include the following:
11.1.1 The mass of the charge in grams,
11.1.2 The density of the charge in grams per millilitre at 15 °C to four significant figures,
11.1.3 The volume of the charge in millilitres at 15 °C,
11.1.4 The gain or loss in mass and volume to the nearest 0.1 %,
11.1.5 A listing of the fractions in order of boiling point with the residue recorded last, and
11.1.6 The cumulative mass and volume percentages.
11.2 The observations recorded in 9.14 during the distillation are normally included as a second sheet attached to the summary sheet. Examples ofa distillation report and record are illustrated in Fig. 8 and Fig. 9.
11.3 Plot curves of temperature in degrees Celsius AET as ordinates against the percents by mass and volume calculated for the fractions above. A smooth curve through this plot constitutes the final distillation curve.
12. Precision and Bias
12.1 Precision - The precision of this test method as determined by the statistical examination of the interlaboratory test results is as follows:
NOTE 7 - The following precision data were developed from data obtained from a 1986 cooperative program (six samples, five laboratories), a 1988 cooperative program (three samples, four laboratories), and individual laboratory data on different samples (five samples, three laboratories). Although these data do not meet the statistical requirements of RR:D02-1007, due to the time and cost involved it is unlikely that an additional cooperative program will be initiated soon.
12.1.1 Repeatability - The difference between successive results obtained by the same operator with the same apparatus under constant operating conditions on identical test materials would, in the long run, in the normal and correct operation of this test method, exceed the following values only in one case in twenty:
12.1.2 Reproducibility - The difference between two single and independent results obtained by different operators working in different laboratories on identical material would, in the long run, exceed the following values only in one case in twenty:
12.2 Bias - Since there is no accepted reference material suitable for determining the bias for the procedure in this test method for measuring vacuum distillation characteristics, bias has not been determined.
13. Keywords
13.1 crude oils; distillation; heavy oils; potstill; residue; vacuum