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EN ISO 6976:2016

Current
Current

The latest, up-to-date edition.

Natural gas - Calculation of calorific values, density, relative density and Wobbe indices from composition (ISO 6976:2016)
Published date

31-08-2016

European foreword
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and units
5 Principles
6 Behaviour of ideal and real gases
7 Calculation of calorific value on a molar basis
8 Calculation of calorific value on a mass basis
9 Calculation of calorific value on a volume basis
10 Calculation of associated properties
11 Uncertainty of calculation
12 Tables of data
Annex A (normative) - Values of auxiliary constants
Annex B (normative) - Formulae for uncertainty calculations
Annex C (informative) - Conversion factors
Annex D (informative) - Example calculations
Bibliography

ISO 6976:2016 specifies methods for the calculation of gross calorific value, net calorific value, density, relative density, gross Wobbe index and net Wobbe index of natural gases, natural gas substitutes and other combustible gaseous fuels, when the composition of the gas by mole fraction is known. The methods specified provide the means of calculating the properties of the gas mixture at commonly used reference conditions.Mole fractions by definition sum to unity. Guidance on the achievement of this requirement by chromatographic analysis is available in ISO 6974‑1 and ISO 6974‑2.The methods of calculation require values for various physical properties of the pure components; these values, together with associated uncertainties, are provided in tables and their sources are identified.Methods are given for estimating the standard uncertainties of calculated properties.The methods of calculation of the values of properties on either a molar, mass or volume basis are applicable to any natural gas, natural gas substitute or other combustible fuel that is normally gaseous, except that for properties on the volume basis the method is restricted to mixtures for which the compression factor at reference conditions is greater than 0,9.Example calculations are given in Annex D for the recommended methods of calculation.NOTE 1 The qualifiers "superior", "higher", "upper" and "total" are, for the purposes of this document, synonymous with "gross"; likewise, "inferior" and "lower" are synonymous with "net". The term "heating value" is synonymous with "calorific value"; "mass density" and "specific density" are synonymous with "density"; "specific gravity" is synonymous with "relative density"; "Wobbe number" is synonymous with "Wobbe index"; "compressibility factor" is synonymous with "compression factor". The dimensionless quantity molecular weight is numerically equal to the molar mass in kg·kmol−1.NOTE 2 There are no explicit limits of composition to which the methods described in this document are applicable. However, the restriction of volume-basis calculations to mixtures with a compression factor greater than 0,9 at reference conditions sets implicit limits on composition.NOTE 3 Because the mole fraction of any water present is not normally available from chromatographic analysis, it is common practice to calculate the physical properties on a dry gas basis and to allow for the effects of water vapour in a separate procedure. However, if the mole fraction of water vapour is known then the property calculations can be carried out completely in accordance with the procedures described herein. The effects of water vapour on calorific value, whether the latter is directly measured or calculated, are discussed in ISO/TR 29922.NOTE 4 For aliphatic hydrocarbons of carbon number 7 or above, any isomer present is included with the normal isomer of the same carbon number.NOTE 5 If the user's requirement includes the replacement of, for example, a C6+ or C7+ grouping of analytically unresolved components by a single pseudo-component, then it is the user's own task to set the mole fraction composition, and hence properties, of this pseudo-component so as to be fit for purpose in the particular application. Any so-called "spectator water" and "non-combustible hydrogen sulfide" are treated as pseudo-components by setting the appropriate enthalpy of combustion values to zero.

Committee
CEN/TC 238
DocumentType
Standard
PublisherName
Comite Europeen de Normalisation
Status
Current

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I.S. EN 777-1:2009 MULTI-BURNER GAS-FIRED OVERHEAD RADIANT TUBE HEATER SYSTEMS FOR NON-DOMESTIC USE - PART 1: SYSTEM D - SAFETY
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UNI EN 1020 : 2009 NON-DOMESTIC FORCED CONVECTION GAS- FIRED AIR HEATERS FOR SPACE HEATING NOT EXCEEDING A NET HEAT INPUT OF 300 KW INCORPORATING A FAN TO ASSIST TRANSPORTATION OF COMBUSTION AIR OR COMBUSTION PRODUCTS
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UNI EN 525 : 2009 NON-DOMESTIC DIRECT GAS-FIRED FORCED CONVECTION AIR HEATERS FOR SPACE HEATING NOT EXCEEDING A NET HEAT INPUT OF 300 KW
UNI EN 777-1 : 2009 MULTI-BURNER GAS-FIRED OVERHEAD RADIANT TUBE HEATER SYSTEMS FOR NON-DOMESTIC USE - PART 1: SYSTEM D - SAFETY
UNI EN 777-2 : 2009 MULTI-BURNER GAS-FIRED OVERHEAD RADIANT TUBE HEATER SYSTEMS FOR NON-DOMESTIC USE - PART 2: SYSTEM E - SAFETY
UNI EN 419-1 : 2009 NON DOMESTIC GAS-FIRED OVERHEAD LUMINOUS RADIANT HEATERS - PART 1: SAFETY
UNI EN 777-3 : 2009 MULTI-BURNER GAS-FIRED OVERHEAD RADIANT TUBE HEATER SYSTEMS FOR NON-DOMESTIC USE - PART 3: SYSTEM F - SAFETY
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DIN EN 12405-3 E : 2016 GAS METERS - CONVERSION DEVICES - PART 3: FLOW COMPUTER
UNE-EN 16726:2016 Gas infrastructure - Quality of gas - Group H
BS EN 62282-3-2:2006 Fuel cell technologies Stationary fuel cell power systems. Performance test methods
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EN 437:2003+A1:2009 Test gases - Test pressures - Appliance categories
DIN EN 525:2009-11 NON-DOMESTIC DIRECT GAS-FIRED FORCED CONVECTION AIR HEATERS FOR SPACE HEATING NOT EXCEEDING A NET HEAT INPUT OF 300 KW
DIN EN 778:2010-03 DOMESTIC GAS-FIRED FORCED CONVECTION AIR HEATERS FOR SPACE HEATING NOT EXCEEDING A NET HEAT INPUT OF 70 KW, WITHOUT A FAN TO ASSIST TRANSPORTATION OF COMBUSTION AIR AND/OR COMBUSTION PRODUCTS
BS EN 778:2009 Domestic gas-fired forced convection air heaters for space heating not exceeding a net heat input of 70 kW, without a fan to assist transportation of combustion air and/or combustion products
BS EN 621:2009 Non-domestic gas-fired forced convection air heaters for space heating not exceeding a net heat input of 300 kW, without a fan to assist transportation of combustion air and/or combustion products
BS EN 777-2:2009 Multi-burner gas-fired overhead radiant tube heater systems for non-domestic use System E. Safety
UNE-EN 1776:2017 Gas infrastructure - Gas measuring systems - Functional requirements
BS EN 1776:2015 Gas infrastructure. Gas measuring systems. Functional requirements
BS EN 777-4:2009 Multi-burner gas-fired overhead radiant tube heater systems for non-domestic use System H. Safety
BS EN 777-1:2009 Multi-burner gas-fired overhead radiant tube heater systems for non-domestic use System D. Safety
UNE-EN 1020:2010 Non-domestic forced convection gas-fired air heaters for space heating not exceeding a net heat input of 300 kW incorporating a fan to assist transportation of combustion air or combustion products
UNE-EN 30-1-1:2009 Domestic cooking appliances burning gas - Part 1-1: Safety - General
UNE-EN 778:2010 Domestic gas-fired forced convection air heaters for space heating not exceeding a net heat input of 70 kW, without a fan to assist transportation of combustion air and/or combustion products
EN 1458-1:2011 Domestic direct gas-fired tumble dryers of types B22D and B23D, of nominal heat input not exceeding 6 kW - Part 1: Safety
EN 621:2009 Non-domestic gas-fired forced convection air heaters for space heating not exceeding a net heat input of 300 kW, without a fan to assist transportation of combustion air and/or combustion products
EN 16723-2:2017 Natural gas and biomethane for use in transport and biomethane for injection in the natural gas network - Part 2: Automotive fuels specification
EN 777-2:2009 Multi-burner gas-fired overhead radiant tube heater systems for non-domestic use - Part 2: System E - Safety
EN 525:2009 Non-domestic direct gas-fired forced convection air heaters for space heating not exceeding a net heat input of 300 kW
EN 1776:2015 Gas infrastructure - Gas measuring systems - Functional requirements
EN 778:2009 Domestic gas-fired forced convection air heaters for space heating not exceeding a net heat input of 70 kW, without a fan to assist transportation of combustion air and/or combustion products
EN 416-1:2009 Single burner gas-fired overhead radiant tube heaters for non-domestic use - Part 1: Safety
EN 16726:2015 Gas infrastructure - Quality of gas - Group H
EN 419-1:2009 Non-domestic gas-fired overhead luminous radiant heaters - Part 1: Safety
EN 777-1:2009 Multi-burner gas-fired overhead radiant tube heater systems for non-domestic use - Part 1: System D - Safety
EN 777-3:2009 Multi-burner gas-fired overhead radiant tube heater systems for non domestic use - Part 3: System F - Safety
EN 16723-1:2016 Natural gas and biomethane for use in transport and biomethane for injection in the natural gas network - Part 1: Specifications for biomethane for injection in the natural gas network
EN 777-4:2009 Multi-burner gas-fired overhead radiant tube heater systems for non-domestic use - Part 4: System H - Safety
DIN EN 16723-2 E : 2017 NATURAL GAS AND BIOMETHANE FOR USE IN TRANSPORT AND BIOMETHANE FOR INJECTION IN THE NATURAL GAS NETWORK - PART 2: AUTOMOTIVE FUELS SPECIFICATION
I.S. EN 437:2003 TEST GASES - TEST PRESSURES - APPLIANCE CATEGORIES
ONORM EN 437 : 2009 TEST GASES - TEST PRESSURES - APPLIANCE CATEGORIES
DIN EN 1457-1:2016-10 (Draft) Chimney - Clay/ceramic flue liners - Part 1: Flue liners operating under dry conditions - Requirements and test methods; German and English version prEN 1457-1:2016
17/30349928 DC : 0 BS EN 437 - TEST GASES - TEST PRESSURES - APPLIANCE CATEGORIES
DIN EN 777-4:2009-09 MULTI-BURNER GAS-FIRED OVERHEAD RADIANT TUBE HEATER SYSTEMS FOR NON-DOMESTIC USE - PART 4: SYSTEM H - SAFETY
DIN EN 419-1:2009-07 NON-DOMESTIC GAS-FIRED OVERHEAD LUMINOUS RADIANT HEATERS - PART 1: SAFETY
DIN EN 30-1-1:2013-06 Domestic cooking appliances burning gas - Part 1-1: Safety - General (includes Amendment 1:2013)
BS EN 1319:2009 Domestic gas-fired forced convection air heaters for space heating, with fan-assisted burners not exceeding a net heat input of 70 kW
BS EN 777-3:2009 Multi-burner gas-fired overhead radiant tube heater systems for non-domestic use System F. Safety
BS EN 30-1-1 : 2008 DOMESTIC COOKING APPLIANCES BURNING GAS - PART 1-1: SAFETY - GENERAL
EN 62282-3-2:2006 Fuel cell technologies - Part 3-2: Stationary fuel cell power systems - Performance test methods
DIN EN 621:2010-04 NON-DOMESTIC GAS-FIRED FORCED CONVECTION AIR HEATERS FOR SPACE HEATING NOT EXCEEDING A NET HEAT INPUT OF 300 KW, WITHOUT A FAN TO ASSIST TRANSPORTATION OF COMBUSTION AIR AND/OR COMBUSTION PRODUCTS
EN 1020:2009 Non-domestic forced convection gas-fired air heaters for space heating not exceeding a net heat input of 300 kW incorporating a fan to assist transportation of combustion air or combustion products
EN 12405-3 : 2015 GAS METERS - CONVERSION DEVICES - PART 3: FLOW COMPUTER
DIN EN 1458-1:2012-02 DOMESTIC DIRECT GAS-FIRED TUBLE DRYERS OF TYPES B22D AND B23D, OF NOMINAL HEAT INPUT NOT EXCEEDING 6 KW - PART 1: SAFETY
DIN EN 1457-1:2012-04 Chimneys - Clay/ceramic flue liners - Part 1: Flue liners operating under dry conditions - Requirements and test methods
DIN EN 437:2009-09 TEST GASES - TEST PRESSURES - APPLIANCES CATEGORIES
UNI EN 30-1-1 : 2013 DOMESTIC COOKING APPLIANCES BURNING GAS - PART 1-1: SAFETY - GENERAL

ISO 6974-2:2012 Natural gas — Determination of composition and associated uncertainty by gas chromatography — Part 2: Uncertainty calculations
ISO/IEC Guide 99:2007 International vocabulary of metrology Basic and general concepts and associated terms (VIM)
ISO 14912:2003 Gas analysis — Conversion of gas mixture composition data
ISO 80000-1:2009 Quantities and units — Part 1: General
ISO 6974-1:2012 Natural gas — Determination of composition and associated uncertainty by gas chromatography — Part 1: General guidelines and calculation of composition
ISO 20765-2:2015 Natural gas Calculation of thermodynamic properties Part 2: Single-phase properties (gas, liquid, and dense fluid) for extended ranges of application
ISO/TR 29922:2017 Natural gas Supporting information on the calculation of physical properties according to ISO 6976
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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