ASTM D4930 Test Method for Dust Control Material on Calcined Petroleum Coke
11. Report
11.1 Report the average of duplicate results to the nearest 0.01 % of dust control material on the coke.
12. Precision and Bias
12.1 Precision is dependent on the absolute amount of oil on the coke as well as the efficiency of the sampling and riffling procedure used (due to variability of the oil application).
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 the test method exceed the following values only in one case in twenty.
Repeatability = 0.04
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.
Reproducibility = 0.15
12.2 Bias - No justifiable statement can be made on the bias of the procedure in this test method because it depends on conformance to the empirical conditions of this test.
13. Keywords
13.1 calcined petroleum coke; de-dusting material; dust control material
