Introduction

Hazardous Area Classification (HAC) is a systematic assessment used to identify and define areas where flammable gases or vapors may be present in sufficient quantities to create an explosive atmosphere.
The study classifies these areas into zones (e.g., Zone 0, Zone 1, Zone 2) based on the frequency and duration of hazardous releases, providing a critical basis for the safe selection and installation of electrical and mechanical equipment in Oil & Gas facilities.

Purpose

• Identify potential sources of flammable gas or vapor releases
• Classify hazardous areas based on likelihood and duration of explosive atmospheres
• Define the extent of hazardous zones around release sources
• Support safe equipment selection in accordance with area classification
• Integrate with dispersion modelling and facility layout considerations
• Ensure compliance with international standards and company requirements (e.g., IEC, API)

Outcomes

• Hazardous area classification drawings showing Zone 0, Zone 1, and Zone 2 extents
• Identification of release sources and classification basis
• Defined hazardous zones based on engineering analysis and/or dispersion inputs
• Recommendations for equipment selection and installation requirements
• Integration with CFD dispersion studies for refined zone justification
• Improved safety in electrical and mechanical system design
• Compliance with applicable standards and regulatory expectations