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BS EN 1839:2017

BS EN 1839:2017

$189.07

Determination of the explosion limits and the limiting oxygen concentration (LOC) for flammable gases and vapours

Published By Publication Date Number of Pages
BSI 2017 48
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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 °C.

PDF Catalog

PDF Pages PDF Title
9 1 Scope
2 Normative references
3 Terms and definitions
11 4 Test methods
4.1 General
12 4.2 Method T (“tube” method)
4.2.1 Detailed method
4.2.2 Reagents and materials
4.2.2.1 Air, which shall be free of water (≤0,1 mol% water vapour absolute) and oil (≤0,1 g / m3 oil)
4.2.2.2 Inert gases, the purity of the inert, or the mixture of inerts, shall be 99,8 % 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
13 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
14 4.2.3.4 Temperature regulating system
15 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
16 4.2.5.3 Determination of the limiting oxygen concentration
4.3 Method B (“bomb” 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
17 4.3.3.3 Explosion overpressure measurement system
4.3.3.4 Equipment for preparing the test mixture
18 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
19 4.3.4.3 Preparation of the test mixture by mixing flows
4.3.5 Procedure
4.3.6 Determination of explosion limits
20 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
21 4.4.2 Procedure
4.4.2.1 General
4.4.2.2 Short procedure
23 4.4.2.3 Extended procedure
24 4.4.2.4 Oxygen analysis
4.5 Recording of results
4.5.1 General
4.5.2 Determination of explosion limits
25 4.5.3 Determination of the limiting oxygen concentration
5 Verification
6 Test report
27 Annex A (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 — flame detachment
A.2.2 Degree of halogenation
A.3 Apparatus
A.3.1 Test vessel
28 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
29 A.6 Procedure
A.6.1 Determination of LEL and UEL
A.6.2 Determination of LOC
30 Annex B (informative)Conversion of the values for the explosion limits
B.1 Abbreviations and symbols
B.2 Substance characteristics of air
31 B.3 Definitions
B.4 Mixture preparation
32 B.5 Conversion
34 Annex C (informative)Examples to describe flame detachment
35 Annex D (informative)Example of recommended evaporator equipment
37 Annex E (normative)Safety measures
E.1 General
E.2 General safety measures
E.3 Additional safety measures concerning the tube method
38 Annex F (informative)Examples of the determination of the LOC
F.1 Example 1: determination of the LOC – short procedure
F.2 Example 2: determination of the LOC – extended procedure
40 Annex G (normative)Verification
42 Annex H (informative)Example of a form expressing the results
44 Annex I (informative)Significant Changes between this European Standard and EN 1839:2012 and EN 14756:2006
45 Annex ZA (informative)Relationship between this European Standard and the essential requirements of Directive 2014/34/EU aimed to be covered

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BS EN 1839:2017
$189.07