ASTM D1796 standard test method for water and sediment in fuel oils by the centrifuge method (Laboratory Procedure)
10. Report
10.1 Report the result V as the water and sediment, % V/V as shown in Table 3.
10.2 Round test results as follows:
10.2.1 Above 2.00 V/V, round to the nearest 0.1 % V/V.
10.2.2 In the range from 0.20 to 2.00 % V/V, round to the nearest 0.05 % V/V.
10.2.3 Below 0.20 % V/V, round as shown in Table 3.
10.3 Report the solvent used, if other than toluene. Report the name and amount of demulsifier, if used. Report the test temperature if it is not 60°C (140°F).
11. Precision and Bias
11.1 Precision - The criteria described in 10.1.1 and 10.1.2 should be used for judging the acceptability of results (95 % probability).
11.1.1 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 Fig. 3 in only one case in twenty.
11.1.2 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 in Fig. 3 in only one case in twenty.
11.2 Bias - Since there is no accepted reference material suitable for determining the bias for the procedure described in Test Method D1796 (API MPMS Chapter 10.6) for determining water and sediment in fuel oils by the centrifuge method, no statement about bias is made.
12. Keywords
12.1 centrifuge; fuel oils; toluene saturation; water and sediment