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BS EN ISO 15971:2014

Current
Current

The latest, up-to-date edition.

Natural gas. Measurement of properties. Calorific value and Wobbe index
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

05-31-2014

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principles of measurement
5 Performance assessment and acceptance tests
6 Sampling and installation guidelines
7 Calibration
8 Verification
9 Maintenance
10 Quality control
Annex A (normative) - Symbols and units
Annex B (informative) - Examples of type-approval and
        technical specifications
Annex C (informative) - Class 0 mass-basis calorimetry
Annex D (informative) - Direct combustion calorimetry
Annex E (informative) - Stoichiometric combustion devices
Annex F (informative) - Effect of non-alkane gases on
        stoichiometric combustion devices
Annex G (informative) - Measurement of Wobbe index
Bibliography

Specifies the measurement of calorific value of natural gas and natural gas substitutes by non-separative methods, i.e. methods that do not involve the determination of the gas composition, nor calculations from it.

This InternationalStandard concerns the measurement of calorific value ofnaturalgas and natural gas substitutes by non-separative methods, i.e. methods that do not involve the determination of the gas composition nor calculation from it. It describes the principles of operation of a varietyof instruments in use forthis purpose, and providesguidelines for the selection, evaluation, performance assessment, installation andoperation of these.

Calorific values can be expressed on a mass basis, a molar basis or, more commonly,a volume basis. The working range for superior calorificvalue of natural gas, on the volume basis, is usuallybetween 30MJ/m3and 45 MJ/m3 at standard reference conditions (see ISO13443). The corresponding range for the Wobbeindex is usuallybetween 40 MJ/m3 and 60 MJ/m3.

This International Standard neitherendorses nor disputes the claims of any commercial manufacturer for theperformance of an instrument. Its central thesis is that fitness-for-purpose in anyparticular application (defined in terms of a set ofspecific operational requirements) can be assessed onlybymeans of a well-designed programme of experimental tests. Guidelines are provided for the proper content of these tests.

Committee
PTI/15
DevelopmentNote
Renumbers and supersedes BS ISO 15971. 2014 Version incorporates corrigendum to BS ISO 15971. (05/2014)
DocumentType
Standard
Pages
62
PublisherName
British Standards Institution
Status
Current
Supersedes

Standards Relationship
EN ISO 15971 : 2014 Identical
ISO 15971:2008 Identical

ISO 10715:1997 Natural gas — Sampling guidelines
IEC 61000-6-4:2006+AMD1:2010 CSV ELECTROMAGNETIC COMPATIBILITY (EMC) - PART 6-4: GENERIC STANDARDS - EMISSION STANDARD FOR INDUSTRIAL ENVIRONMENTS
ISO 6976:2016 Natural gas — Calculation of calorific values, density, relative density and Wobbe indices from composition
IEC 61000-6-2:2016 Electromagnetic compatibility (EMC) - Part 6-2: Generic standards - Immunity standard for industrial environments
IEC 61000-6-1 : 3.0 ELECTROMAGNETIC COMPATIBILITY (EMC) - PART 6-1: GENERIC STANDARDS - IMMUNITY STANDARD FOR RESIDENTIAL, COMMERCIAL AND LIGHT-INDUSTRIAL ENVIRONMENTS
ISO 5725-6:1994 Accuracy (trueness and precision) of measurement methods and results — Part 6: Use in practice of accuracy values
IEC 61000-6-3:2006+AMD1:2010 CSV Electromagnetic compatibility (EMC) - Part 6-3: Generic standards - Emission standard for residential, commercial and light-industrial environments
ISO 14532:2014 Natural gas — Vocabulary
ISO 13443:1996 Natural gas Standard reference conditions
ISO 6142:2001 Gas analysis Preparation of calibration gas mixtures Gravimetric method
IEC 61000-6-1:2016 Electromagnetic compatibility (EMC) - Part 6-1: Generic standards - Immunity standard for residential, commercial and light-industrial environments
ISO 14111:1997 Natural gas — Guidelines to traceability in analysis
IEC 61000-6-4:2006+AMD1:2010 CSV Electromagnetic compatibility (EMC) - Part 6-4: Generic standards - Emission standard for industrial environments
ISO 6145-1:2003 Gas analysis Preparation of calibration gas mixtures using dynamic volumetric methods Part 1: Methods of calibration
IEC 61000-6-2 : 3.0:2016 ELECTROMAGNETIC COMPATIBILITY (EMC) - PART 6-2: GENERIC STANDARDS - IMMUNITY STANDARD FOR INDUSTRIAL ENVIRONMENTS
ISO/IEC Guide 98-3:2008 Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in measurement (GUM:1995)

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