DIN EN ISO 13686:2013-12

National foreword
National Annex NA (informative) - Bibliography
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols, abbreviations and units
5 Quality designation parameters
6 Sampling
Annex A (informative) - Introduction to informative annexes
Annex B (informative) - German Regulation Code of Practice
        DVGW G 260:2008, Extract of the relevant parts
        for natural gases
Annex C (informative) - European Standard EN 437 'Test gases,
        test pressures and categories of appliances'
Annex D (informative) - Interchangeability AGA index method
Annex E (informative) - British Gas Hydrocarbon Equivalence
        Method
Annex F (informative) - Weaver index method
Annex G (informative) - French method for determining gas
        interchangeability (Delbourg method) (guide for
        determining the interchangeability of second
        family gases)
Annex H (informative) - Spanish regulation code (Detail
        Protocol-01 - Measurement) - Extract of the relevant
        parts for natural gases
Annex I (informative) - Harmonization of gas property data
        for cross-border transportation
Bibliography

Defines the parameters required to describe finally processed and, where required, blended natural gas.