The third edition of the standard “ISO 6976 Natural gas – Calculation of calorific values, density, relative density and Wobbe indices from composition” was issued in 2016. Through technical revision, it cancels and replaces the second edition from 1995. As stated in the third editions’ introduction, adoption of the revisions detailed in this standard will not be without cost, as instrumental (and ERP business) software will need updating. QuantityWare has carefully analyzed this third edition. The major technical changes are:
1) New method to calculate ideal and real molar-based calorific value and thus subsequent calorific values (mass and volume based)
2) Introduction of net Wobbe index
3) New component data (n-dodecane, n-tridecane, n-tetradecane, n-pentadecane)
4) Completely updated physical property data and auxiliary constants
5) Harmonization with GPA 2172 and related U.S. customary based standards – Provision of different reference pressures in all formulas of ISO 6976
QuantityWare will provide new implementations and integration configuration options for ISO 6976(2016) with BCS 3.0 CSP02, which is currently planned for release in Q1 2019.