Hazardous Area classification is a method of analysing and classifying the environment where explosive gas atmospheres may occur. The main purpose is to facilitate the proper selection and installation of apparatus to be used safely in that environment, taking into account the properties of the flammable materials that will be present. We specifically extends the original scope of this analysis, to take into account non-electrical sources of ignition, and mobile equipment that creates an ignition risk.

Hazardous areas are classified into zones based on an assessment of the frequency of the occurrence and duration of an explosive gas atmosphere.

Scope of Study

  • To review the existing Hazardous Area Classification of the plant with respect to IS 5572 and relevant international standards like NFPA 497,70 and 499, IEC 60079-10-1 and IEC 60079-10-2.
  • To review the selection of electrical equipment installed in the hazardous area as per IS 5571 and IEC 60079-0 guidelines. The area classification will be utilised to develop the hazardous area layouts for the facility and define the basis for correct selection & location of fixed electrical / instrumentation equipment items. The ‘Zone’ for a release is determined based on the grade of release, area of release and ventilation in the area.

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