Proficiency Tests on Natural Gas finished

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Download the report (iis15S01M) of the Proficiency Tests on Natural Gas

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Summary of this proficiency test:

On 26 May 2015, the proficiency tests on Natural Gas (iis15S01M) was finished. They started 11 March 2015 (see message "Proficiency Test on Natural Gas started" on this website) when the samples were distributed.

In this interlaboratory study 49 laboratories in 30 countries have participated.

The participants were requested to determine on Methane, Ethane, Propane, n-Butane, iso-Butane, Carbon dioxide, Nitrogen, Caloric Value (sup), Density, Relative Density, Wobbe index.

The proficiency test report summarises per test, the test results, the analytical methods reported by the participants and the z-scores calculated for each participant are tabulated. Also, for each test, the calculated summary (e.g. mean, standard deviation and reproducibility) is given.

In the report also an evaluation of the test results is given. Problems encountered in the analyses are mentioned and - where possible - suggestions for quality improvement are formulated. For each test a comparison is made between the results of the group of participants and the requirements given by the relevant standard (e.g. ISO, ASTM).