ISO 12185 Crude petroleum and petroleum products - Determination of density - Oscillating U-tube method
13 Expression of results
Express the density to the nearest 0.1 kg/m3, at the reference temperature.
14 Precision
14.1 Repeatability, r
The difference between two test results obtained by the same operator with the same apparatus under constant operating conditions on identical test material, in the normal and correct operation of this test method, would exceed the values given below only in one case in 20.
Transparent middle distillates: r = 0.2 kg/m3
Crude oils and other petroleum products: r = 0.4 kg/m3
14.2 Reproducibility, R
The difference between two single and independent results obtained by different operators working in different laboratories on identical test material, in the normal and correct operation of this test method, would exceed the values given only in one case in 20.
Transparent middle distillates: R = 0.5 kg/m3
Crude oils and other petroleum products: R = 1.5 kg/m3
NOTE 14 The precision was developed in accordance with ISO 4259.
15 Test report
The test report shall contain at least the following information:
a) a reference to this International Standard (ISO 12185:1996);
b) the type and identification of the product under test;
c) the sampling procedures used (see clause 7);
d) the test temperature;
NOTE 15 When the test temperature is significantly different from the reference temperature, it is recommended that the observed density is also reported.
e) the result of the test (see clause 13);
f) any deviation, by agreement or otherwise, from the procedure specified;
g) the date of the test.
