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Wherever Inflammable, Explosive and corrosive vapours liquids and gases are expected to be present the most important demand to be met by elevator in such hazardous area is high degree of reliability and perfection " SINCE FAULTS MAY ENTITLE SERIOUS DANGER TO PERSONNEL & PLANT ". For selection of explosion proof elevator, following points should be taken care of:
(1) Hazardous Area: Hazardous area catagorised into zones depending on the frequency and duration as per IS:5572 (Part-I) i.e. zone zone '1 and zone 2'
(2) Ignition Temperature: Flammable gases and vapours are categorized in temperature classes from Tl to T6. Ignition temperature is the lowest temperature at which the flammable gas will ignite.
(3) Hazardous Gas: Hazardous gas have been classified in IS: 2148- 1981 and are associated only with flame proof enclosures. These gases along with the ignition temperature classes are listed as following :
All electrical apparatus are housed in flame proof enclosures confirming to IS.2148 and mechanical components are designed so that there is no ferrous metal to ferrous metal contact in order to void and chance of sparking. Hence 'SAFEX' flame proof elevator are flame proof as well as spark proof. 'Safex' flame proof elevators are offered for Gas Group I, IIA & IIB suitable for zone-1 & zone-2 Areas.
