NEN EN 14994 : 2007

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Venting of enclosures
5 Venting of isolated compact enclosures
  5.1 General
  5.2 Venting of isolated compact enclosures
  5.3 Situations outside the constraints of the basic
       method (turbulence inducing elements, partially
       filled enclosures)
       5.3.1 General
       5.3.2 Elevated initial pressure
       5.3.3 Effect of initial turbulence
       5.3.4 Effect of partial filling
       5.3.5 Venting of enclosures containing turbulence
             inducing elements
  5.4 Elongated enclosures
       5.4.1 General
       5.4.2 Venting of elongated enclosures vented at
             each end
       5.4.3 Venting of elongated enclosures vented along
             the enclosure
  5.5 Pipes
  5.6 Interconnected enclosures
  5.7 Vent ducts
6 Supplementary design aspects
  6.1 General
  6.2 Positioning and shape of explosion vents
  6.3 Choice of venting device
  6.4 External effects
       6.4.1 General
       6.4.2 Flame effects
       6.4.3 Pressure effects
       6.4.4 Deflectors
  6.5 Recoil forces
7 Information for use
  7.1 Marking
  7.2 Accompanying documents
Annex A (informative) Assessment of the level of
        congestion in rooms containing turbulence
        including elements
Annex ZA (informative) Relationship between this
         European Standard and the Essential Requirements
         of EU Directive 94/9/EC
Bibliography

Describes the basic design requirements for the selection of a gas explosion venting protective system.