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Fire Hazard Classification

 
Light Hazard Occupancies
 
Ordinary Hazard Occupancies (Grup 1,Grup 2,Grup 3)
 
Extra Hazard Occupancies (Grup 1,Grup 2)
Minumum water requirements for sprinkler systems

NFPA 13 Hazard classification.

Hazard classification hierarchy

The requirements contained in NFPA 13 are keyed to the hazard classification. Section 2-1 in the 1999 edition of NFPA 13 indicates there are three basic hazard classifications used in the design of sprinkler systems. These three hazard classifications are as follows:

• Light Hazard

• Ordinary Hazard

• Extra Hazard

This same section in NFPA 13 also indicates that the ordinary hazard classification is divided into two sub-classifications an ordinary group 1 hazard and an ordinary group 2 hazard. Similarly, the extra hazard classification is also divided into two sub-classifications — an extra group1 hazard and an extra group 2 hazard.

The definitions of each of the hazard classifications are also included in section 2-1 in NFPA13, which defines hazard classification based upon a number of occupancy characteristics.

These characteristics are as follows:

• The combustibility of contents.

• The quantity of combustibles.

• Rate of heat release.

• Storage height.

• Quantity of flammable and/or combustible liquids.

NFPA 13 defines a light hazard occupancy using the following description:

• Combustibility of the contents is low, and

• Quantity of the combustible is low, and

• Low rates of heat release.

The NFPA 13 definition an ordinary group 1 hazard is as follows:

• Combustibility of the contents is low, and

• Quantity of the combustibles is moderate, and

• Moderate heat release rates, and

• Height of storage is 8 feet or less.

NFPA 13 defines an ordinary group 2 hazard as follows:

• Combustibility of the contents is moderate to high, and

• Quantity of the combustibles is moderate to high, and

• Moderate to high rates of heat release, and

• Storage height is 12 feet or less.

The NFPA 13 definition of an extra group 1 hazard is as follows:

• Combustibility of the contents is very high, and

• Quantity of the combustibles is very high, and

• High rates of heat release, and

• Quantity of flammable and/or combustible liquids small.

Finally, the NFPA 13 definition of an extra group 2 hazard is as follows:

• Quantity of flammable or combustible liquids is moderateto high, or

• Extensive shielding of the combustibles is present.

Interpretation by example

 
 
 
   
 
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