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

Hydraulic Calculations

Special Design Approaches

Residential Sprinklers

In new residential occupancies, the design of the system is the area that includes the four (4) adjacent sprinklers that produce the highest hydraulic demand.  Almost all residential systems will be calculated on the basisNFPA 13 allows for the design to be calculated on the minimum flow rates indicated in the sprinkler manufacturer's listing for the sprinkler used. of a hydraulic design of 0.10 gpm/sq. ft. for the area encompassed by the four (4) sprinklers.

If there is an existing residential occupancy being modifiedThis also includes additions to existing systems., a lesser design density can be calculated.  However, this requirement specifically outlines the use of listed residential sprinklers. In other words, sprinklers listed specifically for residential applications that have been in place prior to the requirement of meeting the density of 0.10 gpm/sq. ft. are the only sprinkler allowed for a lesser density. Other quick response sprinklers are not allowed.

In residential occupancies that have attics, basements or other similar spaces that are outside of the living unit, these spaces are calculated separately.  Calculations also are required to include hose stream allowances as listed for light hazard occupancies.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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