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

Example text

Secondary Sostanza Product Temperatura di infiammabilità.. Inferiore alla temperatura di processo e alla temperatura ambiente Flash point....................................... Below process and ambient temperature Densità dei vapori...................... Superiore a quella dell’aria Vapour density................................ Greater than air Taking into account relevant parameters, the following are typical values which will be obtained for this example: a = 1 m horizontally from source of release; b = 1 m above source of release; c = 1 m horizontally; d = 2 m horizontally; e = 1 m above ground.

In questo esempio è illustrato un modo di utilizzo degli esempi N° 1, 6, 8 e 9. All’interno del deposito si trovano: tre serbatoi di benzina con bacino di contenimento (elemento 3), cinque pompe di liquido installate una a fianco all’altra (elemento 1), una pompa singola (elemento 1), un impianto per il caricamento di autobotti (elemento 4), due serbatoi di gasolio (elemento 4) e un separatore a gravità olio/acqua (elemento 2). I principali fattori che influenzano il tipo di zone sono indicati nelle tabelle degli esempi N° 1, 6, 8 e 9.

Signifies “surrounded by”. 7 Calculations to ascertain the degree of ventilation Calcoli per la determinazione del grado di ventilazione Calculation No. ) Grado di emissione continuo Fattore di sicurezza, k 0,25 Portata di emissione, (dG/dt)max 2,8 · 10-10 kg/s Ventilation characteristics Indoor situation Number of air changes, C 1/h, (2,8 · 10-4/s) Quality factor, f 5 Ambient temperature, T 20°C (293 K) Temperature coefficient, (T/293 K) 1 Caratteristiche della ventilazione Luogo al chiuso Numero di ricambi d’aria, C 1/h, (2,8 · 10-4/s) Fattore di efficacia, f 5 Temperatura ambiente, T 20 °C (293 K) Coefficiente di temperatura, (T/293 K) 1 Minimum volumetric flow rate of fresh air: Portata volumetrica minima di aria fresca: – 10 ( dG ⁄ dt ) max T 293 2, 8 ⋅ 10 –8 3 ( dV ⁄ dt ) min = ------------------------------- ⋅ --------- = -------------------------------- ⋅ --------- = 2, 4 ⋅ 10 m ⁄ s k ⋅ LEL 293 0, 25 ⋅ 0, 046 293 Evaluation of hypothetical volume Vz: Valutazione del volume ipotetico Vz: –8 f ⋅ ( dV ⁄ dt ) min 5 ⋅ 2, 4 ⋅ 10 –4 3 V z = ----------------------------------- = 4, 3 ⋅ 10 m - = ------------------------------–4 C 2, 8 ⋅ 10 Time of persistence: This is not applicable to a continuous release.

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


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