BS EN 14491:2012

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Venting of enclosures
5 Sizing of vent areas
6 Supplementary design considerations
7 Marking
8 Information for use
Annex A (informative) - Explosion venting of dust filters
Annex B (informative) - Explosion venting of cyclones
Annex C (informative) - Estimating the L/D ratio when
        calculating vent areas for elongated enclosures
Annex D (informative) - Protection of buildings
Annex E (informative) - Deflectors
Annex F (informative) - Significant changes between
        this European Standard and EN 14491:2006
Annex ZA (informative) - Relationship between this
         European Standard and the Essential Requirements
         of EU Directive 94/9/EC
Bibliography

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

This European Standard specifies the basic requirements of design for the selection of a dust explosion venting protective system. This European Standard is one of a series including EN 14797, Explosion venting devices and EN 14460, Explosion resistant equipment. The three standards together represent the concept of dust explosion venting. To avoid transfer of explosions to other communicating equipment, one should also consider applying EN 15089 Explosion Isolation Systems.

This European Standard covers:

• vent sizing to protect an enclosure against the internal pressure effects of a dust explosion;

• flame and pressure effects outside the enclosure;

• recoil forces;

• influence of vent ducts;

• hybrid mixtures.

This European Standard is not intended to provide design and application rules against effects generated by detonation reactions or runaway exothermic reactions. This European Standard does not cover fire risks arising from materials either processed, used or released by the equipment or from materials that make up equipment and buildings. This European Standard does not cover the design, construction, testing and certification of explosion venting devices that are used to achieve explosion venting¹).