What is termed as a hazardous zone in a plant?
The area in which inflammable gas or vapors are present is called a hazardous zone. Hazardous zones are categorized as Zone0, Zone1, and Zone2 depending upon the severity of the hazard. Zone0 refers to continuous hazard. Zone1 to intermittent hazard under working conditions and zone2 refers to hazard under fault condition only. Those areas that do not fall under any of these categories are referred to as non-hazardous. Certain norms have to be followed in the choice and installation procedures of instruments meant for the various zones. Recommendations can be found in the relevant standard specifications.
