ASTM D1322 Test Method for Smoke Point of Kerosine and Aviation Turbine Fuel
13. Precision and Bias
13.1 Repeatability, r - The difference between successive test results obtained by the same operator with the same apparatus under constant operating conditions on identical 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 20:
r = 2 mm
13.2 Reproducibility, R - The difference between two single and independent results obtained by different operators working in different laboratories on nominally 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 20:
R = 3 mm
NOTE 9 - Precision values were determined from a joint ASTM/IP program conducted in 1972. Six reference fuel blends and ten Jet A and Jet B fuels were tested covering a range of smoke points from 15 to 45 mm.
13.3 Bias - The procedure in Test Method D1322 for measuring the smoke point of kerosines and aviation turbine fuels has no bias because the value of the smoke point can only be defined in terms of a test method.
14. Keywords
14.1 aviation turbine fuel; combustion properties; jet fuel; kerosine; radiant heat; smoke point
