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NOTE: This is an unformatted excerpt from our online fire protection training library.

Hydraulic Calculations

Density/Area Method

Graphs and Curves

The density/area method is the method used for many designs, especially in larger commercial, institutional and industrial applications.  This method uses the graph found in the "Design Approaches" chapter of the sprinkler standard, NFPA 13This figure, 11.2.3.1.1, was taken from NFPA 13-2010...in other editions, the figure number may be different due to changes in the different editions. But, this is the same figure number in NFPA 13-2007..  From this graph, the designer chooses a density to be applied to the corresponding most hydraulically remote areaArea of Sprinkler Operation, in this graph. of the space .  There are five curves on the graph, each representing a different occupancy hazardThis means that the designer has to understand and apply the correct occupancy hazard, or the design may end up being inadequate to protect the occupancy and the space. classification.

The curves represent the range of designs that can be selected. Once the designer determines the occupancy hazard, such as light or extra hazard, he or she selects a discharge density and the corresponding area of application.  The selected figures can also be used to develop an estimate in determining the minimum water supply requirements.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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