7. Report
7.1 Report the results as indicated in the following tabulation:
7.2 The calculated true vapor pressure psia may be converted to the International System of Units (SI) of kilopascals (kPa) by multiplying the results obtained in 7.1 by the conversion factor 6.894757 and then rounding to the appropriate number of significant digits.
8. Precision and Bias
8.1 Precision - The precision of this test method as determined by statistical examination of interlaboratory results is as follows:
8.1.1 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 only in one case in twenty: the larger of 2 psia (14 kPa) or 4 % of the mean of the two results.
8.1.2 Reproducibility - The difference between two, single and independent results, obtained by different operators working in different laboratories on identical test material, would, in the normal and correct operation of the test method, exceed the following value only one case in twenty: the larger of 2 psia (14 kPa) or 8 % of the mean of the two results.
NOTE 2 - The preceding repeatability and reproducibility were obtained from results submitted by seven laboratories that cooperatively tested four turbine fuels with initial boiling points in the range 320 to 400°F (160 to 204°C), and end points in the range 430 to 534°F (221 to 279°C). Each laboratory determined the required distillation and gravity data in duplicate, and performed the calculations required for this procedure once for each of the two sets of determined data for each sample. Vapor pressures were not determined during the cooperative program.
8.2 Bias - The bias of the true vapor pressures obtained by this test method has not been evaluated. Determined true vapor pressures were not known for the fuels cooperatively tested.
9. Keywords
9.1 API gravity; D86 distillation; true vapor pressure