ASTM D4740 for cleanliness and compatibility of residual fuels by Spot test
10. Report
10.1 Report the cleanliness or the compatibility rating as an integer from 1 to 5 as determined in 8.8. Report the blend ratio when other than 50:50 is used to determine the capability rating.
11. Precision and Bias
11.1 Precision and bias statements have not been determined for the preparation of the spots; however, a precision statement regarding how different individuals rate spots was determined by a modified round robin test. The need for statements pertaining to the preparation of the spots is being considered.
11.1.1 The precision of the procedure in Test Method D4740, for different individuals using the same D4740 Adjunct Reference Spots in conjunction with Table 1 to rate the same spots prepared in accordance with Test Method D4740 from field samples, as determined at a common site is as follows:
11.1.1.1 Repeatability - The difference between successive ratings of the same spot by the same individual viewed under same conditions would, in the long run, not exceed one rating number only in one case in twenty.
11.1.1.2 Reproducibility - The difference between two single independent ratings obtained by different individuals for the same spot viewed under the same conditions would, in the long run, not exceed one rating number only in one case in twenty.
11.2 Bias - Since there is no accepted reference material suitable for preparing the spots used in the spot rating procedures in Test Method D4740, bias has not been determined.
12. Keywords
12.1 cleanliness; compatibility; residual fuel; spot test
