BS EN 15089:2009

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Explosion isolation systems
  4.1 General
  4.2 Isolation types
      4.2.1 Passive isolation type
      4.2.2 Active isolation type
5 Requirements of explosion isolation components
  5.1 General
  5.2 Detection devices
      5.2.1 General
      5.2.2 Optical detection
      5.2.3 Pressure detection
      5.2.4 Other actuation
  5.3 Indicating equipment (IE) and control and
      indicating equipment (CIE)
      5.3.1 General
      5.3.2 Indicating equipment
      5.3.3 Control and indicating equipment
  5.4 Safety integrity of control and indicating
      equipment (CIE)
      5.4.1 General
      5.4.2 Measures to avoid and control
            systematic faults
      5.4.3 Control of electric connections
      5.4.4 Indicators and messages on CIE
      5.4.5 Energy supply
  5.5 Explosion isolation devices
      5.5.1 General
      5.5.2 Explosion protection valve (active
            or passive) - F&P
      5.5.3 Extinguishing barrier (active) - F
      5.5.4 Rotary valve (passive) - F
      5.5.5 Explosion proof interlocked double
            valve arrangement (passive) - F&P
      5.5.6 Diverters, explosion isolation flaps and
            flame arresters
6 System design
  6.1 General
  6.2 Combination of explosion isolation systems
      with other explosion protection techniques
      6.2.1 Explosion resistant design for the
            maximum explosion pressure -
            isolation
      6.2.2 Venting - isolation
      6.2.3 Suppression - isolation
7 Experimental testing of the efficacy of an explosion
  isolation system
  7.1 General
  7.2 Test Modules
      7.2.1 General
      7.2.2 Module A: Explosion resistance
            testing
      7.2.3 Module B: Flameproof testing
      7.2.4 Module C: Functional testing
  7.3 Testing Report
8 Information for use
9 Marking
  9.1 Marking of the explosion isolation
      system
  9.2 Marking of components of an explosion
      isolation system
Annex A (informative) - Verification of design methods
      A.1 General
      A.2 Design on the basis of an interpretation of
          test results
      A.3 Mathematical model
Annex ZA (informative) - Relationship between this European
         Standard and the Essential Requirements of EU
         Directive 94/9/EC
Bibliography

Specifies the general requirements for explosion isolation systems.

This European Standard describes the general requirements for explosion isolation systems. An explosion isolationsystem is a protective system, which prevents an explosion pressure wave and a flame or only a flame frompropagating via connecting pipes or ducts into other parts of apparatus or plant areas. This European Standard specifies methods for evaluating the efficacy of the various explosion isolation systems, and methods for evaluatingdesign tools for such explosion isolation systems when applying these in practice. This European Standard also sets out the criteria for alternative test methods and interpretation means to validate the efficacy of explosion isolations. It covers e.g.: general requirements for the explosion isolation components; evaluating the effectiveness of an explosion isolation system; evaluating design tools for explosion isolation systems. This European Standard is applicable only to the use of explosion isolation systems that are intended for avoiding explosion propagation between interconnected enclosures, in which an explosion may result as a consequence of ignition of an explosive mixtures e.g., dust-air mixtures, gas-(vapour-)air mixtures, dust-, gas-(vapour-)air mixtures and mists. In general explosion isolation systems are not designed to prevent the transmission of fire or burning powder either of which can initiate an explosion in downstream plant items. It is necessary to take this situation into account in risk assessments. This European Standard is only applicable for gas and dust explosions of chemically stable substances and mixtures of these (flame propagating at subsonic velocity). This European Standard is not applicable for explosions of materials listed below, or for mixtures containing some of those materials: i) chemically unstable substances that are liable to decompose; ii) explosive substances; iii) pyrotechnic substances. This European Standard does not cover flame arresters. For these devices refer to EN 12874.