| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 1<\/td>\n | BRITISH STANDARD BS EN ISO 13686:2005 Natural gas – Quality designation <\/td>\n<\/tr>\n | ||||||
| 2<\/td>\n | This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 August 1998 National foreword <\/td>\n<\/tr>\n | ||||||
| 3<\/td>\n | Contents <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | Contents <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | Foreword <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | Introduction 1 Scope 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 3 Definitions 3.1 natural gas 3.2 liquefied natural gas 3.3 substitute natural gas 3.4 raw gas 3.5 local distribution system <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 3.6 gas quality 3.7 reference conditions 3.8 calorific values 3.8.1 superior calorific value 3.8.2 inferior calorific value 3.9 density 3.10 relative density <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 3.11 Wobbe index 3.12 compression factor 3.13 water dew point 3.14 hydrocarbon dew point 3.15 molar composition 3.16 gas composition 3.17 gas analysis 3.18 interchangeability 3.19 odorization <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 3.20 methane number 4 Symbols, abbreviations and units <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 5 Quality designation parameters 5.1 Gas composition 5.1.1 Major components 5.1.2 Minor components 5.1.3 Trace constituents <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 5.2 Gas properties 5.2.1 Physical properties 5.2.2 Other properties NOTE Technically free means that there are no visible traces of the components mentioned under actual conditions. 6 Sampling <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | Annex A (informative) Introduction to informative annexes NOTE Deutscher Verein des Gas- und Wasserfaches (DVGW) is a scientific association whose prime task is the production of codes of practice for the entire gas and water industry. It is a member of DIN. <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | Table A.1 – Definitions for testing appliances and gas quality <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | NOTE Existing approaches to interchangeability are based essentially on experience and studies with atmospheric burner, natural … The European test gas procedures, as embodied in EN 437, provide continuous interchangeability proof for equipment by means of appliance <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | Table A.2 – Natural gas components <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | Table A.3 – Regions and states <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | Table A.4 – Natural gas composition and physical properties Figure A.1 – Regional Distribution of Gas Composition Survey Areas <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | Figure A.2 – Non-Methane Constituents in Natural Gas 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 <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | Table B.1 – DVGW G260\/I:1983 2nd gas family Table B.2 – Gas secondary substances; Maximum guide values a The guide value for the mercaptan sulfur content of 6 mg\/m3 can at present not be maintained for all natural gases. <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | Annex C (informative) European standard EN 437 \u201cTest gases, test pressures and categories of appliances\u201d Table C.1 – Test pressures for gas groups in the 2nd family according to EN 437 Figure C.1 – Gas groups and test gases in the 2nd family (NG) according to EN 437 <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | Table C.2 – Test gases for gas groups in the 2nd family according to EN 437 a Flame lift, group ES Annex D (informative) Interchangeability A.G.A. Index Method <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | Table D.1 – Test gases used for the example to explain the A.G.A. Method <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | Annex E (informative) British Gas Hydrocarbon Equivalence Method Table E.1 – Composition and physical properties Table E.2 – Equivalence factors for hydrocarbons <\/td>\n<\/tr>\n | ||||||
| 39<\/td>\n | Table E.3 – Equivalent four-component mixture for gas <\/td>\n<\/tr>\n | ||||||
| 40<\/td>\n | Figure E.1 – Volume of interchangeability showing inner and outer limits Figure E.2 – The two dimensional interchangeability diagram <\/td>\n<\/tr>\n | ||||||
| 41<\/td>\n | Annex F (informative) Weaver Index Method Table F.1 – Weaver Index limits <\/td>\n<\/tr>\n | ||||||
| 42<\/td>\n | Annex G (informative) French Method for Determining Gas Interchangeability (Delbourg Method) <\/td>\n<\/tr>\n | ||||||
| 43<\/td>\n | Table G.1 – Gas properties <\/td>\n<\/tr>\n | ||||||
| 44<\/td>\n | Figure G.1 – Correction coefficient \u201cK1\u201d for Wobbe index (second-family gases) Figure G.2 – Correction coefficient \u201cK2\u201d for Wobbe index (second-family gases) Figure G.3 – Correction coefficient \u201cU\u201d for combustion potential (second-family gases) <\/td>\n<\/tr>\n | ||||||
| 45<\/td>\n | Figure G.4 – Mean correction coefficient for hydrocarbons higher than methane (second-family gases) Figure G.5 – Gas interchangeability diagram (second-family gases) <\/td>\n<\/tr>\n | ||||||
| 47<\/td>\n | Annex H (informative) Bibliography <\/td>\n<\/tr>\n | ||||||
| 48<\/td>\n | BS 3156-11.0.2: 1998 ISO 13686:1998 <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Natural gas. Quality designation<\/b><\/p>\n |