NBN EN 12082 : 2008 + A1 2010

Introduction
1 Scope
2 Normative references
3 Definitions
4 Symbols, abbreviations and units
5 Quality designation parameters
    5.1 Gas composition
    5.2 Gas properties
6 Sampling
Annex A (informative) Introduction to informative annexes
    A.1 Quality specification
    A.2 Interchangeability
    A.3 Natural gas, Local distribution system
    A.4 Condensation curves
    A.5 Odorization
    A.6 Nominal range of natural gas components
Annex B (informative) German Regulations Code of Practice
DVGW G 260 I:1983, G 260/II: 1990 Extract of the relevant
parts for natural gases
    B.1 Basic gases, substitute gases, additive gases
    B.2 Standard state
    B.3 Standard values
    B.4 Gas families, groups
    B.5 Gas composition
    B.6 Notes on the technical burning data
    B.7 Notes on the gas constituents and gas secondary
        substances
    B.8 Data and guide values for the gas quality
Annex C (informative) European standard EN 437 "Test gases,
test pressures and categories of appliances"
Annex D (informative) Interchangeability A.G.A. Index Method
    D.1 Example for a calculation
Annex E (informative) British Gas Hydrocarbon Equivalence
Method
    E.1 Composition-based prediction
    E.2 Prediction of Interchangeability
    E.3 Three Dimensional Prediction Diagram
Annex F (informative) Weaver Index Method
Annex G (informative) French Method for Determining Gas
Interchangeability (Delbourg method)
    G.1 Calculation of Interchangeability Indices on the
        Basis of Chemical Composition of the Gas
    G.2 Interchangeability limits for Second-family Gases
        for Domestic Appliances at 20 mbar
Annex H (informative) Bibliography