high-risk-areas
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high risk areas
Standards
areas within an individual property where the fire load of readily ignited material (such as flammable liquid, loose paper, organic foams) exceeds 4500 MJ/m2 of floor area of a compartment of not more than 1000 m2 in area, e.g. dip tanks of flammable liquids in a metalwork manufacturing factory or woodwork processing or finishing areas
The NFPA
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Fire Protection Handbook, 18th edition defines fire load as follows:
- (a) Low fire load The fire load of an occupancy is described as low if it does not exceed an average of 1140 MJ/m2 of net floor area of any compartment, nor an average of 2280 MJ/m2 in limited isolated areas, provided that storage of combustible material necessary to the occupancy may be allowed to a limited extent if separated from the remainder and enclosed by appropriate-grade fire-resistive construction. Examples of occupancies of normal low fire load are retail shops, factories, and workshops.
- (b) Moderate fire load The fire load of an occupancy is described as moderate if it exceeds an average of 1140 MJ/m2 of net floor area of any compartment but does not exceed an average of 2280 MJ/m2, nor an average of 4560 MJ/m2 in limited isolated areas, provided that storage of combustible material necessary to the occupancy may be allowed to a limited extent if separated from the remainder and enclosed by fire-resistive construction of an appropriate grade. Examples of occupancies of normal moderate fire load are retail shops, factories, and workshops.
- (c) High fire load The fire load of an occupancy is described as high if it exceeds an average of 2280 MJ/m2 of net floor area but does not exceed an average of 4560 MJ/m2 of net floor area, nor an average of 9120 MJ/m2 in limited isolated areas. Examples of occupancies with normal high fire load are warehouses and other buildings used for the bulk storage of commodities of a recognised nonhazardous nature.
Source - AS 2665-2001: Design, installation and commissioning