August 2016

Environment and Safety

Consider post-design changes to confine a hazardous area

Hazardous area classification (HAC) is carried out while performing basic design engineering, and HAC drawings are produced as one of the deliverables.

Bapat, S. V., Petrokon Utama Sdn Bhd

Fig. 1. Example of a hazardous area classification. Hazardous area classification (HAC) is carried out while performing basic design engineering, and HAC drawings are produced as one of the deliverables. The objective of the area classification is to avoid simultaneous occurrence of a flammable mixture and an ignition source. HAC drawings are used to select the electrical equipment, to plan the maintenance activities, to control the traffic movement within internal roads and to make the decisions on facility layout (FIG. 1). Note: HAC classification does not consider the toxicity of the handled fluids. The hazardous area and the zone sizes can

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