This European Standard specifies two test methods (method T and method B) to determine the explosion limits of gases, vapours and their mixtures, mixed with air or an air \/ inert gas mixture (volume fraction of the oxygen < 21 %) and the limiting oxygen concentration. This European Standard applies to gases, vapours and their mixtures at atmospheric pressure for temperatures up to 200 \u00b0C.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 9<\/td>\n | 1 Scope 2 Normative references 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 4 Test methods 4.1 General <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 4.2 Method T (\u201ctube\u201d method) 4.2.1 Detailed method 4.2.2 Reagents and materials 4.2.2.1 Air, which shall be free of water (\u22640,1\u00a0mol% water vapour absolute) and oil (\u22640,1\u00a0g\u00a0\/\u00a0m3 oil) 4.2.2.2 Inert gases, the purity of the inert, or the mixture of inerts, shall be 99,8\u00a0% mol. or better 4.2.2.3 Flammable substances, which may be either a single substance or a defined mixture of substances or a process sample (of known or unknown composition) 4.2.2.4 Heat-resistant, chemically inert material for gaskets and adhesive mountings <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 4.2.3 Apparatus 4.2.3.1 Test vessel 4.2.3.2 Ignition source 4.2.3.3 Equipment for preparing the test mixture <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 4.2.3.4 Temperature regulating system <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 4.2.3.5 Safety equipment 4.2.4 Preparation of the test mixture 4.2.5 Procedure 4.2.5.1 General 4.2.5.2 Determination of explosion limits <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 4.2.5.3 Determination of the limiting oxygen concentration 4.3 Method B (\u201cbomb\u201d method) 4.3.1 Principle 4.3.2 Reagents and materials 4.3.3 Apparatus 4.3.3.1 Test vessel 4.3.3.2 Ignition source <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 4.3.3.3 Explosion overpressure measurement system 4.3.3.4 Equipment for preparing the test mixture <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 4.3.3.5 Temperature regulating system 4.3.3.6 Safety equipment 4.3.4 Preparation of the test mixture 4.3.4.1 General 4.3.4.2 Preparation of the test mixture by partial pressures <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 4.3.4.3 Preparation of the test mixture by mixing flows 4.3.5 Procedure 4.3.6 Determination of explosion limits <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 4.3.7 Determination of the limiting oxygen concentration 4.4 Determination of the limiting oxygen concentration 4.4.1 Metering devices and additional equipment <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 4.4.2 Procedure 4.4.2.1 General 4.4.2.2 Short procedure <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 4.4.2.3 Extended procedure <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 4.4.2.4 Oxygen analysis 4.5 Recording of results 4.5.1 General 4.5.2 Determination of explosion limits <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 4.5.3 Determination of the limiting oxygen concentration 5 Verification 6 Test report <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | Annex\u00a0A (normative)Method for determination of the explosion limits and limiting oxygen concentration of substances that are difficult to ignite A.1 Background A.2 Explanation A.2.1 Explosion criterion \u2014 flame detachment A.2.2 Degree of halogenation A.3 Apparatus A.3.1 Test vessel <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | A.3.2 Reagents and materials A.3.3 Ignition source A.3.4 Equipment for preparing the test mixture A.4 Safety equipment A.5 Preparation of the test mixture <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | A.6 Procedure A.6.1 Determination of LEL and UEL A.6.2 Determination of LOC <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | Annex\u00a0B (informative)Conversion of the values for the explosion limits B.1 Abbreviations and symbols B.2 Substance characteristics of air <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | B.3 Definitions B.4 Mixture preparation <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | B.5 Conversion <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | Annex\u00a0C (informative)Examples to describe flame detachment <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | Annex\u00a0D (informative)Example of recommended evaporator equipment <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | Annex\u00a0E (normative)Safety measures E.1 General E.2 General safety measures E.3 Additional safety measures concerning the tube method <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | Annex\u00a0F (informative)Examples of the determination of the LOC F.1 Example\u00a01: determination of the LOC \u2013 short procedure F.2 Example\u00a02: determination of the LOC \u2013 extended procedure <\/td>\n<\/tr>\n | ||||||
| 40<\/td>\n | Annex\u00a0G (normative)Verification <\/td>\n<\/tr>\n | ||||||
| 42<\/td>\n | Annex\u00a0H (informative)Example of a form expressing the results <\/td>\n<\/tr>\n | ||||||
| 44<\/td>\n | Annex\u00a0I (informative)Significant Changes between this European Standard and EN\u00a01839:2012 and EN\u00a014756:2006 <\/td>\n<\/tr>\n | ||||||
| 45<\/td>\n | Annex\u00a0ZA (informative)Relationship between this European Standard and the essential requirements of Directive 2014\/34\/EU aimed to be covered <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Determination of the explosion limits and the limiting oxygen concentration (LOC) for flammable gases and vapours<\/b><\/p>\n |