EN 14994:2007 – Gas explosion venting protective systems

EN 14994:2007 - Gas explosion venting protective systems

1 Scope
This European Standard specifies the basic design requirements for the selection of a gas explosion venting protective system. This European Standard, EN 14797 and EN 14460 form a series of three standards which are used together.
NOTE 1 These three standards together represent the concept of gas explosion venting.
NOTE 2 To avoid transfer of explosions to other communicating equipment one should also consider applying prEN 15089.
This European Standard is applicable to:
vent sizing to protect against the internal pressure effects of a gas explosion;
flame and pressure effects outside the enclosure;
recoil forces;
influence of vent ducts;
influence of initial temperature and pressure.
This European Standard does not provide design and application rules against effects generated by detonation reactions or runaway exothermic reactions including decomposition in the gas phase.
This European Standard is not applicable to:
fire risks arising either from materials processed, used or released by the equipment or from materials that make up equipment and buildings;
design, construction and testing of explosion venting devices, which are used to achieve explosion venting 1) ;
protection against overpressures caused by events such as overfilling, overpressurisation, fire engulfment,overheating etc.
NOTE 3 Protection by venting against dust and hybrid explosions is specified in EN 14491.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 1127-1:1997, Explosive atmospheres — Explosion prevention and protection — Part 1: Basic concepts and methodology
EN 13237:2003, Potentially explosive atmospheres — Terms and definitions for equipment and protective systems intended for use in potentially explosive atmospheres
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 1127-1:1997 and EN 13237:2003 and the following apply.
atmospheric conditions
conditions of the surrounding medium where the atmospheric pressure can vary between 80 kPa and 110 kPa and the temperature between − 20 °C and 60 °C
for the purpose of this European Standard, gas, vapour or any mixture thereof at atmospheric conditions
compact enclosures
enclosures having a length (height) to diameter ratio of less than 2
[EN 14373:2005, 3.14.1]
NOTE The length L is calculated along the axis parallel to the main flow during the explosion, with D being the diameter measured perpendicular to this axis. For non-circular cross-sections, D is the diameter of a circle with the same area as the actual cross-sectional area.
EN 14994:2007 – Gas explosion venting protective systems

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