Fire Fighting Hazards Classification

 Fire Fighting Hazards Classification : Occupancy hazard classification is the most critical aspect of the sprinkler system design process .

Fire Fighting Hazard Classification
Fire Fighting Hazard Classification 

If the hazard is underestimated, it is possible for fire to over power the sprinklers (resulting in a large loss of property or life )

The classification of Fire Fighting hazard varies according to the commodities and application of the project .


  • Light Hazard 
  • Ordinary Hazard Group (1)
  • Ordinary Hazard Group (2)
  • Extra  Hazard Group (1)
  • Extra Hazard Group (2) 


The Fire Fighting Light Hazeard

Fire Fighting Light Hazard
Fire Fighting Light Hazard 

Also Read : Type of Fire Sprinkles 

Fire Fighting Light hazard occupancies shall be defined as occupancies or portions of other occupancies where the quantity and / or combustibility of contents is low and fires with relatively low rates of heat release are expected .

Fire Fighting Ordinary Hazard (group 1)


Fire Fighting ordinary Hazard group 1
Fire Fighting ordinary Hazard group 1


Fire Fighting Ordinary hazard (group 1) occupancies shall be defined as occupancies where combustibility is low, quantity of combustibles is moderate.
Stockpiles of combustibles do no exceed 8 ft (2.4 m) and fire with moderate rates of heat release are expected .

Fire Fighting Ordinary hazard ( group 2 ) 

Fire Fighting ordinary Hazard group 2
Fire Fighting ordinary Hazard group 2


Occupancies shall be defined as occupancies or portions of other occupancies where the quantity and combustibility of contents are moderate to high 

Stockpiles do not exceed 12 ft (3.7 m) and fire with moderate to high rates of heat release are expected

Stockpiles do not exceed 12 ft (3.7 m), and fires with moderate to high rates of heat release are expected.

Also Read: Fire Zone Control Valve


Fire Fighting Extra hazard (group 1)

Fire Fighting Extra Hazard
Fire Fighting Extra Hazard 

Extra hazard (group 1) occupancies shall be define as occupancies or portions of other occupancies where the quantity and combustibility of contents are very high and dust, lint, or ohet material are present, introducing the probability of rapidly developing fire with high rates of heat release but with little or no combustible or flammable liquid. 

Also Read : FM-200 and CO2 Calculator Software - GAS Fire Protection System


Fire Fighting Extra hazard (group 2)

Fire Fighting Extra Hazard group 2
Fire Fighting Extra Hazard group 2


Extra whazard (group 2) occupancies shall be defined as occupancies or portions of other occupancies with moderate to substantial amounts of flammable or combustible liquids or occupancies where shielding of combustibles is expensive.

Also Read : Requirements for installation of Fire Sprinkler 

Also Read: FM 200 Fire Suppression Calculator ( Excel Sheet ) 

Also Read : Foam Fire Extinguishing System Calculations Excel Sheet

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