EN 12874 : 2001

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions, symbols and abbreviations
   3.1 Terms and definitions
   3.2 Symbols and abbreviations
4 Hazards and flame arrester classifications
   4.1 Flame transmission: Deflagration, stable
        unstable detonation
   4.2 Flame transmission: Stabilized burning
5 General requirements
   5.1 Construction
   5.2 Housings
   5.3 Joints
   5.4 Joints to adjacent pipework
   5.5 Pressure test
   5.6 Leak test
   5.7 Flow measurement (air)
   5.8 Flame transmission test
6 Specific requirements for static flame arresters
   6.1 Construction
   6.2 Design series
   6.3 Flame transmission test
   6.4 Limits for use
7 Specific requirements for liquid product detonation
   flame arresters
   7.1 Liquid seals
   7.2 Foot valves
   7.3 Flame transmissions test
   7.4 Limits for use
8 Specific requirements for high velocity vent valves
   8.1 Flame transmission test
   8.2 Endurance burning test
   8.3 Deflagration test
   8.4 Additional burning test
   8.5 Flame transmission test by opening and closing
   8.6 Limits for use
9 Specific requirements for flow controlled apertures
   9.1 Equipment
   9.2 Flame transmission test
   9.3 Limits for use
10 Specific requirements for hydraulic flame arresters
   10.1 Equipment
   10.2 Flame transmission tests
   10.3 Limits for use
11 Specific requirements for testing flame arresters in
        equipment
   11.1 Flame transmission test in compressors, including
        blowers, fans and vacuum pumps
12 Information for use
   12.1 Accompanying documents
   12.2 Marking
Annex A (normative) Flow measurement
Annex B (normative) Graphic symbols for flame arresters
Annex C (informative) Guidelines for specifying flame
         arresters
Annex D (informative) Best practice
Annex ZA (informative) Clauses of the European Standard
         addressing essential requirements or other
         provisions of EU Directives
Bibliography

Specifies requirements for flame arresters which prevent flame transmission when flammable, vapour gas/air-mixtures are present. Establishes uniform principles for the classification, basic construction and making of flame arresters and test methods to verify the safety requirements.