ASTM D4006 standard test method for water in crude oil by distillation
11. Report
11.1 Report the result as the water content to the nearest 0.025 %, reporting water content of less than 0.025 % as 0 %, and reference this Test Method D4006 (API MPMS Chapter 10.2) as the procedure used.
12. Precision and Bias
12.1 The precision of this test method, as obtained by statistical examination of interlaboratory test results in the range from 0.01 to 1.0 %, is described in 12.1.1 and 12.1.2.
12.1.1 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 following value in only one case in twenty:
From 0.0 % to 0.1 % water, see Fig. 3.
Greater than 0.1 % water, repeatability is constant at 0.08.
12.1.2 Reproducibility - The difference between the 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 following value in only one case in twenty:
From 0.0 % to 0.1 % water, see Fig. 3
Greater than 0.1 % water, reproducibility is constant at 0.11.
13. Keywords
13.1 crude oil; distillation; water
