04/30122896 DC : DRAFT SEP 2004

FORWARD<br>INTRODUCTION<br>1 Scope<br>2 Normative references<br>3 Terms and definitions<br>4 Symbols and units<br>5 General principles<br>6 Gas measurement<br>&nbsp;&nbsp;&nbsp;6.1 General<br>&nbsp;&nbsp;&nbsp;6.2 Volume measurement<br>&nbsp;&nbsp;&nbsp;6.3 Calorific value measurement<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.3.1 Measurement techniques and sampling<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.3.2 Direct measurement (calorimetry)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.3.3 Inferential measurement<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.3.4 Correlation techniques<br>&nbsp;&nbsp;&nbsp;6.4 Volume conversion<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.4.1 General<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.4.2 Density<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.4.3 Pressure and temperature<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.4.4 Compression factor<br>&nbsp;&nbsp;&nbsp;6.5 Calibration<br>&nbsp;&nbsp;&nbsp;6.6 Data storage and transmission<br>7 Energy determination<br>&nbsp;&nbsp;&nbsp;7.1 Interfaces<br>&nbsp;&nbsp;&nbsp;7.2 Methods of energy determination<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7.2.1 Direct determination pf energy<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7.2.2 Indirect determination of energy<br>8 Strategy and Procedures<br>&nbsp;&nbsp;&nbsp;8.2 Strategies for energy determination<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.2.1 Strategies for the single interfaces<br>&nbsp;&nbsp;&nbsp;8.3 Plausibility checks<br>9 Assignment methods<br>&nbsp;&nbsp;&nbsp;9.1 Fixed assignment<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.1.1 Fixed assignment of a measured calorific value<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.1.2 Fixed assignment of declared calorific value<br>&nbsp;&nbsp;&nbsp;9.2 Variable assignment<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.2.1 Input at two or more different stations with <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;zero floating point<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.2.2 Input at two or more different stations with <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;commingled gas flows<br>&nbsp;&nbsp;&nbsp;9.3 Determination of the representative calorific value<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.3.1 Arithmetic average calorific value<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.3.2 Quantity weighted average calorific value<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.3.3 Quality tracking<br>10 Calculation of energy quantities<br>&nbsp;&nbsp;&nbsp;10.1 General calculation equations for energy<br>&nbsp;&nbsp;&nbsp;10.2 Calculation of averaged value<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10.2.1 Arithmetic average of the calorific value<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10.2.2 Weighted average of the calorific value<br>&nbsp;&nbsp;&nbsp;10.3 Volume conversion and volume to mass conversion<br>&nbsp;&nbsp;&nbsp;10.4 Energy determination on the basis of declared <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;calorific value<br>11 Accuracy on calculated energy<br>&nbsp;&nbsp;&nbsp;11.1 Accuracy<br>&nbsp;&nbsp;&nbsp;11.2 Calculation of uncertainty<br>&nbsp;&nbsp;&nbsp;11.3 Bias<br>12 Quality control and quality assurance<br>&nbsp;&nbsp;&nbsp;12.1 General<br>&nbsp;&nbsp;&nbsp;12.2 Check of the course of the measuring data<br>&nbsp;&nbsp;&nbsp;12.3 Traceability<br>&nbsp;&nbsp;&nbsp;12.4 Substitute values<br>Annex A (informative) Mainly used instruments for and energy <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;determination techniques<br>Annex B (informative) Different possible courses of the <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;calorific value<br>Annex C (informative) Volume conversion and volume to mass <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;conversion<br>Annex D (informative) Incremental energy determination<br>Annex E (informative) Practical example for volume conversion <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;and energy quantity calculation<br>Annex F (informative) Practical example for averaging the <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;calorific value due to different delivery <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;situations<br>Annex G (informative) Ways to Determining Substitute Values<br>Annex H (informative) Plausibility check graphical example<br>Annex I (Informative) Uncorrected data, bias correction and final <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;result graphical example<br>Annex J (informative) Single reservoir calorific value determination<br>&nbsp;

ISO 15112