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A Technical Analysis: Listings and Applications of Residential Sprinklers
Author            : James Golinveaux
Designation    :Sr. Vice President
Company        : Tyco Fire & Building Products
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Synopsis
Recent changes to the National Fire Protection Association (NFPA) Standard 13D - Installation of Sprinkler Systems One and Two Family Dwellings and Manufactured Homes, Standard 13R - Installation of Sprinkler Systems in Residential Occupancies up to and Including Four Stories in Height, and revisions to Underwriters Laboratory (UL) Standard 1626 - Standard for Residential Sprinklers - have prompted the largest revision to residential sprinklers since the early 1980’s. Until these recent changes, manufacturers have held a wide variety of listings with applications of residential sprinklers from sprinkler spacings of 12’ X 12’ to 20’ X 20’; and horizontal ceiling heights of 8 ft, to sloped ceilings with a pitch of 8/12 (rise over run) with unlimited ceiling heights. Additionally, discharge densities that had no specified minimums in the UL or NFPA standards resulted in Listings as low as .03-gpm/sq ft. This reduction is significant compared to the minimum density of .09-gpm/sq ft. density referenced in NFPA 13D in the 1980 to 1999 editions. In 2002, the UL Directory listed 110 Models of residential sprinklers with over 600 different applications. Both the NFPA 13D-2002 & NFPA 13R-2002 edition, with an effective date of August 8, 2002 contain a new minimum discharge density of .05-gpm/sq ft for all residential sprinkler coverage areas. Although this is a reduction to the minimum densities specified by NFPA 13D and NFPA 13R, it is an increase in flow rates from the special Listings manufacturers have obtained from UL over the past 20 years.

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