ASTM D7169 Test Method for Boiling Point Distribution of Samples with Residues
ASTM D7169 Standard Test Method for Boiling Point Distribution of Samples with Residues Such as Crude Oils and Atmospheric and Vacuum Residues by High Temperature Gas Chromatography
17. Report
17.1 Report the temperatures to the nearest 0.5°C (1°F) at 1 % intervals between 1 % and up to the nearest integer of the lower boundary of the %RC. Report also the initial boiling point (IBP). Report the selected cut point intervals.
18. Precision and Bias
18.1 Precision - The precision of this test method was determined by the statistical examination of the interlaboratory test results for five crude oils and five residues. It is important to note that the Results for the precision statement as shown in Tables 4-6 are to be used only within the ranges shown in the tables. Additional studies are required to expand the precision to the ranges not listed in Tables 4-6, respectively.
18.1.1 Repeatability - The difference between successive test 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 the test method, exceed the values in only one case in twenty as shown in Table 4 (Residues), Table 5 (Crude Oil), and Table 6 for Cuts (as used in the ASTM Crosscheck for Crude Oils).
18.1.2 Reproducibility - The difference between two single and independent test results obtained by different operators working in different laboratories on identical test material would, in the long run, in the normal and correct operation of the test method, exceed the values shown in Table 4 (Residues), Table 5 (Crude Oil), and Table 6 for Cuts (as used in the ASTM Crosscheck for Crude Oils).
18.2 Bias - The bias in results of this test method cannot be determined because the boiling range distribution is defined by the test method.
19. Keywords
19.1 boiling point distribution; crude oils; cut point intervals; distillation residues; lubricants; residues; simulated distillation
