ASTM D6078 Standard Test Method for Evaluating Lubricity of Diesel Fuels
ASTM D6078 Standard Test Method for Evaluating Lubricity of Diesel Fuels by the Scuffing Load Ball-on-Cylinder Lubricity Evaluator (SLBOCLE)
15. Report
15.1 Report the following information:
15.1.1 For Procedure A, Incremental-Load Test:
15.1.1.1 Report the average of the applied loads in grams determined in 11.14.16 and 11.14.17 for which the maximum friction coefficient exceeds 0.175.
15.1.1.2 Description of the test fuel and date of sampling.
15.1.1.3 Date of testing.
15.1.1.4 Any deviation from the test condition given in Table 1.
15.1.2 For Procedure B, Single-Load Test:
15.1.2.1 The selected applied load in grams and the maximum friction coefficient during the single-load test from 11.14.12.
15.1.2.2 Whether the fluid passed or failed the lubricity evaluation at the selected applied load.
15.1.2.3 Description of the test fuel and date of sampling.
15.1.2.4 Date of testing.
15.1.2.5 Any deviations from the test conditions given in Table 1.
16. Precision and Bias
16.1 Precision - The precision was developed for fuels with SLBOCLE's between 1100 and 6200 g. The precision data were developed in a 1995 cooperative testing program involving both United States and European testing laboratories. There were 9 distinct fluids and each laboratory was given 18 fluids to test. The fluids were blind coded so that replicate samples were not known to the operator. A randomized test sequence was provided and each laboratory was requested to use the same operator and equipment for all 18 samples. Nine laboratories participated in this round robin.
16.1.1 The difference between two 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 this test method, exceed the following value in only one case in twenty:
Repeatability = 900 g
16.1.2 The difference between two single and independent results obtained by different operator working in different laboratories on identical test material would, in the long run, in the normal and correct operation of this test method, exceed the following value in only one case in twenty:
Reproducibility = 1500 g
16.2 Bias - The procedure in this test method has no bias because lubricity is not a fundamental and measurable fluid property and thus is evaluated in terms of this test method.
17. Keywords
17.1 boundary lubrication; diesel fuel; friction; lubricity; wear
