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Download IEC 60079-2 Electrical apparatus for explosive gas by IEC TC/SC 31 PDF

By IEC TC/SC 31

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Additional info for IEC 60079-2 Electrical apparatus for explosive gas atmospheres - Pressurized enclosures 'p'P

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The concentration of oxygen in the flammable substance shall not exceed 2 % (V/V). There shall not be any normal release (see annex E) of the flammable substance. The UEL of the flammable substance shall not exceed 80 %. NOTE 1 It is difficult or impossible to protect with leakage compensation using inert gas when the flammable substance is capable of reacting with little or no oxygen present (that is to say it has a UEL greater than 80 %). 3 should be used to dilute the flammable substance. 1 60079-2 © CEI:2001 Surpression interne avec dilution Pas de dégagement Le gaz de protection doit être de l'air ou du gaz inerte.

1 Généralités Le choix de gaz de protection dépend de la probabilité, de la quantité et des constituants du dégagement du système de confinement. Voir le tableau 4 pour la tabulation du gaz de protection autorisé. 3 – 45 – Containment system with a limited release The design of a containment system with limited release shall be such that the rate of release of the flammable substance is predictable in all conditions of containment system failure. The quantity of flammable substance released into the pressurized enclosure includes the quantity of flammable substance in the containment system and the flow of the flammable substance entering the containment system from the process.

La condition particulière en vue d'une utilisation sans danger doit spécifier le débit et la pression maximale de la substance inflammable dans le système de confinement. Les enveloppes à surpression interne contenant une flamme doivent être évaluées de la même façon que si la flamme était éteinte. La quantité maximale de mélange air/combustible qui alimente la flamme doit être ajoutée à la quantité de dégagement du système de confinement. NOTE 1 Des joints élastomères, des fenêtres et autres parties non métalliques du système de confinement sont permis.

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