Description

Flame proof Gas Group Group II equipment is subdivided into three subgroups.  Group IIA—Atmospheres containing propane, or gases and vapors of equivalent hazard.  Group IIB—Atmospheres containing ethylene, or gases and vapors of equivalent hazard.  Group IIC—Atmospheres containing acetylene or hydrogen, or gases and vapors of equivalent hazard. Zone classification For the purpose of installation of electrical equipment's, the areas have been divided into 3 categories of hazardous areas namely-  Zone 0 - area where inflammable gas and vapours are expected to be continuously present eg. inside the tank.  Zone – 1- area where inflammable gas and vapours are expected to be present under normal operating conditions eg. on the mouth of the vent pipe or near fill point, unloading point etc., during the operation.  Zone -2 area where inflammable gas and vapours are expected to be present under abnormal operating condition eg. during the failure or rupture of the equipment.