BS EN ISO 15112:2018
$215.11
Natural gas. Energy determination
| Published By | Publication Date | Number of Pages |
| BSI | 2018 | 80 |
This document provides the means for energy determination of natural gas by measurement or by calculation, and describes the related techniques and measures that are necessary to take. The calculation of thermal energy is based on the separate measurement of the quantity, either by mass or by volume, of gas transferred and its measured or calculated calorific value. The general means of calculating uncertainties are also given.
Only systems currently in use are described.
NOTE Use of such systems in commercial or official trade can require the approval of national authorization agencies, and compliance with legal regulations is required.
This document applies to any gas-measuring station from domestic to very large high-pressure transmission.
New techniques are not excluded, provided their proven performance is equivalent to, or better than, that of those techniques referred to in this document.
Gas-measuring systems are not the subject of this document.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 4 | European foreword Endorsement notice |
| 7 | Foreword |
| 8 | Introduction |
| 9 | 1 Scope 2 Normative references 3 Terms and definitions |
| 14 | 4 Symbols and units |
| 15 | 5 General Principles |
| 16 | 6 Gas measurement 6.1 General |
| 17 | 6.2 Volume measurement 6.3 Calorific value measurement 6.3.1 Measurement techniques and sampling |
| 18 | 6.3.2 Direct measurement — Calorimetry 6.3.3 Inferential measurement 6.3.4 Correlation techniques 6.3.5 Pressure and temperature 6.3.6 Gas quality tracking 6.4 Volume conversion 6.4.1 General |
| 19 | 6.4.2 Density 6.4.3 Compression factor 6.5 Calibration 6.6 Data storage and transmission |
| 20 | 7 Energy determination 7.1 Interfaces |
| 22 | 7.2 Methods of energy determination 7.2.1 Direct determination of energy 7.2.2 Indirect determination of energy |
| 24 | 8 Strategy and procedures 8.1 General |
| 25 | 8.2 Strategies for energy determination |
| 26 | 8.2.1 Strategies for single interfaces |
| 30 | 8.3 Plausibility checks |
| 31 | 9 Assignment methods 9.1 Fixed assignment 9.1.1 Fixed assignment of a measured calorific value |
| 32 | 9.1.2 Fixed assignment of a declared calorific value |
| 33 | 9.2 Variable assignment 9.2.1 Input at two or more different stations with zero floating point |
| 34 | 9.2.2 Input at two or more different stations with comingled gas flows |
| 35 | 9.3 Determination of the representative calorific value 9.3.1 Arithmetically averaged calorific value 9.3.2 Quantity-weighted average calorific value 9.3.3 Gas quality tracking |
| 38 | 10 Calculation of energy quantities 10.1 General formulae for energy |
| 39 | 10.2 Calculation of averaged values — Calculation from average calorific values and cumulative volumes 10.2.1 Arithmetic average of the calorific value |
| 40 | 10.2.2 Quantity-weighted average of the calorific value 10.3 Volume and volume-to-mass conversions 10.4 Energy determination on the basis of declared calorific values 11 Accuracy on calculated energy 11.1 Accuracy |
| 41 | 11.2 Calculation of uncertainty |
| 42 | 11.3 Bias |
| 43 | 12 Quality control and quality assurance 12.1 General 12.2 Check of the course of the measuring data |
| 44 | 12.3 Traceability 12.4 Substitute values |
| 46 | Annex A (informative) Main instruments and energy-determination techniques |
| 50 | Annex B (informative) Different possible patterns in the change of the calorific value |
| 53 | Annex C (informative) Volume conversion and volume-to-mass conversion |
| 54 | Annex D (informative) Incremental energy determination |
| 56 | Annex E (informative) Practical examples for volume conversion and energy quantity calculation |
| 60 | Annex F (informative) Practical examples for averaging the calorific value due to different delivery situations |
| 65 | Annex G (informative) Ways of determining substitute values |
| 67 | Annex H (informative) Plausibility check graphical example |
| 68 | Annex I (informative) Uncorrected data, bias correction and final result graphical example |
| 70 | Annex J (informative) Single-reservoir calorific value determination |
| 72 | Annex K (informative) |
| 78 | Bibliography |
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BS EN ISO 15112:2018 – TC:2020 Edition
Tracked Changes. Natural gas. Energy determination Published By Publication Date Number of Pages BSI 2020…
