CEI EN 60079-10 Electrical Apparatus For Explosive Gas

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Additional resources for CEI EN 60079-10 Electrical Apparatus For Explosive Gas Atmospheres. Classification Of Hazardous Areas

Example text

4 Control valve, installed in a closed process pipework system conveying flammable gas: Esempio N° 4 Valvola di regolazione, installata in un sistema di tubazioni a circuito chiuso che trasportano gas infiammabile CAPTION LEGENDA 1 1 Ground level Livello del suolo 1 Sorgente di emissione (valvola) Source of release (valve) Zona 2_Zone 2 Esempio 4 Principali fattori che influenzano il tipo e l’estensione delle zone Principal factors which influence the type and extent of zones Impianto e processo Plant and process Ventilazione Ventilatation Tipo..........................................

Grado di emissione secondo Fattore di sicurezza, k 0,5 Portata di emissione, (dG/dt)max 1 kg/s Ventilation characteristics Outdoor situation Minimum wind speed 0,5 m/s Resulting in an air exchange, C >3 · 10-2 /s Quality factor, f 3 Ambient temperature, T 15°C (288 K) Temperature coefficient, (T/293 K) 0,98 Caratteristiche della ventilazione Luogo all’aperto Minima velocità del vento 0,5 m/s Corrispondenti ad un ricambio d’aria, C 3 · 10-2/s Fattore di efficacia, f 3 Temperatura ambiente, T 15 °C (288 K) Coefficiente di temperatura, (T/293 K) 0,98 Minimum volumetric flow rate of fresh air: Portata volumetrica minima d’aria fresca: ( dG ⁄ dt ) max T 1 288 3 ( dV ⁄ dt ) min = ------------------------------- ⋅ --------- = ----------------------------- ⋅ --------- = 58, 1 m /s k ⋅ LEL 293 0, 5 ⋅ 0, 033 293 Evaluation of hypothetical volume Vz: Valutazione del volume ipotetico Vz: f ⋅ ( dV ⁄ dt ) min 3 ⋅ 58, 1 3 V z = ----------------------------------= 5810 m - = ------------------–2 C 3 ⋅ 10 Time of persistence: Tempo di persistenza: –3 –f 5 ⋅ 0, 5 LEL ⋅ k t = ----- ln ----------------- = ------------ ln ---------------- = 370 s (massimo_maximum) 0, 03 C 100 Xo Conclusion The hypothetical volume Vz is significant but can be controlled, and would not persist.

Buona Availability................................ Good Sorgente di emissione Grado di emissione Source of release Grade of release Tenute del compressore, valvole e flange vicine al compressore......... Secondo Compressor seals, valves and flanges close to the compressor............................ Secondary Sostanza Product Gas Idrogeno Gas Hydrogen Densità dei vapori Inferiore a quella dell’aria Gas density Lighter than air Taking into account relevant parameters, the following are typical values which will be obtained for this example: a = 3 m horizontally from source of release; b = 1 m horizontally from ventilation openings; c = 1 m above ventilation openings.

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