fans for atex explosive atmospheres and other applications - Sodeca
fans for atex explosive atmospheres and other applications - Sodeca
fans for atex explosive atmospheres and other applications - Sodeca
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Fans <strong>for</strong> ATEX EXPLOSIVE ATMOSPHERESAn ATEX area is a mixture of air <strong>and</strong> inflammable gas, the vapour of an inflammable liquid, a fog of combustible liquidor combustible powder, which, if they catch fire, do so at once in their entirety.Sensitivity to the ignition of gases:LIE Minimum concentration of explosivity » % volume.LSE Maximum concentration of explosivity » % volume.EMI Minimum ignition energy » 10-6 μ JoulesFlash Point Minimum temperature of a liquid <strong>for</strong>ms inflammable gasesTemperature – Temperature at which a gas ignitestemperature – T1, T2, T3, T4, T5 <strong>and</strong> T6Sensitivity to the ignition of solids:LIE or CME Minimum concentration <strong>explosive</strong> » g/m 3CLO Maximum concentration of Oxygen » % volumeEMI Minimum ignition energy » 10-3 μ JoulesTMI Minimum ignition temperature in ºC:- In a TMI n cloud (a cloud of dust in contact with a hot surface).- In a TMI c layer, ignition of a 5 mm layer.- (limit of T the lesser of: 2/3 of TMI n or TMI c -75ºC)Summary of definitions of the zonesExplosive <strong>atmospheres</strong>II 3 G. EEx nAII 3 D. IP55 (non-conductive dust)II 2 D. IP65 (conductive dust)Zone 2 (gas)Zone 22 (dust)Not probable under normal operatingconditionsZone 1 (gas)Zone 21 (dust)Probable under normal operatingconditionsII 2 G. EEx dII 2 G. EEx deII 2 G. EEx pII 2 G. EEx eII 2 D. IP65Zone 0 (gas)Zone 20 (dust)Electric motorscannot be usedDefinition of zones:Gases <strong>and</strong> vapours / Powders:• Zone 0 / Zone 20:Present continuously, during long periods of timeor frequently. It is not possible to use electric motors.• Zone 1 / Zone 21:It is probable in normal operating conditions• Zone 2 / Zone 22:The creation of an ATEX zone is not probable under normaloperating conditionsGroups <strong>and</strong> categories of apparatus:GROUP I: Equipment <strong>for</strong> underground <strong>and</strong> surface work inmines with danger of firedamp or <strong>explosive</strong> powders.• M1 Category: must remain operative• M2 Category: it must be possible to cut off the energy supplyGROUP II: Other danger zones• Category 1: a very high level of protection. Highly probable area.• Category 2: a high level of protection. Probable area.• Category 3: a normal level of protection. Improbable area.10
Change language