Annex A.10 Comparison

This table compares this implementation with Table A.10, "Additional numerical examples for software validation purposes", from ISO 17507-1:2025.

Calculating Annex A.10 examples...

1. Published Annex A.10 MN_C value.
2. This implementation's MN_C minus the reference value.
3. Final range between the selected partial-mixture methane numbers before the inert correction is added.
4. Ternary systems used in the final calculated result.
5. Systems selected initially, then removed from the final weighted result because their contribution fell below the minimum threshold.

The spread values are an internal consistency indicator for the selected partial-mixture calculation. Low spread indicates that the selected systems have converged to very similar partial methane numbers before they are combined, so the weighted result is well determined.

The largest deviations are observed for examples that exercise demanding parts of the method, including low methane numbers, several non-methane combustible components, hydrogen, acid gas, and unsaturated hydrocarbons.