Section 32A(1) in The Static and Mobile Pressure Vessels (Unfired) Rules, 2016
(1)A hazardous area for flammable gases shall be deemed to be -(a)a zone '0' area if inflammable gases or vapours are expected to be continuously present in the area; or(b)a zone '1' area, if inflammable gases or vapours are expected to be continuously present in the area under normal operating conditions; or(c)a zone '2' area, if inflammable gases or vapours are expected to be continuously present in the area only under abnormal operating conditions or failure or rupture of an equipment.
