ISO 3734 Petroleum products - Determination of water and sediment in residual fuel oils - Centrifuge method
8 Expression of results
Record the final volume of water and sediment in each tube and report the sum of these two readings rounded according to 7.5 as the percentage volume of sediment and water. Report results lower that 0.05 % either as 0 or 0.05, whichever is closer.
9 Precision
The criteria described in 9.1 and 9.2 shall be used for judging the acceptability of results (95 % probability).
9.1 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 normal and correct operation of the test method, exceed the values in figure 3 in only one case in twenty.
9.2 Reproducibility
The difference between two single and independent test results, obtained by different operators working in different laboratories on nominally identical test material would, in the normal and correct operation of the test method, exceed the values in figure 3 in only one case in twenty.
10 Test report
The test report shall contain at least the following information:
a) a reference to this International Standard;
b) the type and complete identification of the product tested;
c) the results of the test (see clause 8);
d) the name and amount of demulsifier used;
e) the heating bath temperature;
f) any deviation, by agreement or otherwise, from the standard procedures specified;
g) the date of the test.
