ASTM D1405 Test Method for Estimation of Net Heat of Combustion of Aviation Fuels
7. Report
7.1 Report the result in megajoule per kilogram to the nearest 0.001 or British thermal units per pound to the nearest integer as estimated Net Heat of Combustion, D1405.
8. Precision and Bias
8.1 Repeatability - The difference between successive test results obtained by the same operator with the apparatus under constant operating conditions on identical test material (using a second set of measured values for the aniline point temperature, the relative density, and the sulfur content determined by Test Methods D611, D1298, and D129, respectively) 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:
Repeatability = 0.012 MJ/kg or 5 BTU/lb
8.2 Reproducibility - The difference between two single and independent results obtained by different operators working in different laboratories on identical test material (using the aniline point temperature, the relative density, and the sulfur content determined by Test Methods D611, D1298, and D129, respectively) would, in the long run, in the normal and correct operation of the test method, exceed the following values only in one case in twenty:
Reproducibility = 0.035 MJ/kg or 15 BTU/lb
NOTE 4 - Use of fuel property data obtained with greater or lesser precision than that of the methods indicated will have a like trend on the precision of the predicted heat of combustion.
8.3 Bias - No general statement is made on bias for the standard, since the data used to determine the correlation cannot be compared with accepted reference materials.
9. Keywords
9.1 aviation fuel; gross heat of combustion; heat energy; heat of combustion; heating tests; net heat of combustion
