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American Fire Sprinkler Association [http://www.firesprinkler.org/] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ AFSA Technical Update ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ A newsletter dealing with codes and other technical issues February 1, 2013 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ NFPA 13 - Shadowing There were several proposals and comments during the development of the 2013 editions of NFPA 13, NFPA 13D, and NFPA 13R for allowable shadow areas. Shadow areas are areas not covered by the spray pattern of a sprinkler due to the presence of obstructions. The proposals and comments were aimed at establishing an area limit for portions of the floor that are not covered by the sprinkler spray pattern due to these obstructions. The technical committees for these standards handled this concept differently. NFPA 13 has multiple sprinkler obstruction rules in place such as the "Three Times Rule" and the "Four Times Rule," that provide spacing criteria from certain obstructions. These rules essentially allow dry areas where obstructions prevent sprinkler discharge from reaching certain areas of the floor. The presence of these obstruction rules in NFPA 13 prompted the technical committee to reject all the proposals regarding shadowing. NFPA 13R and NFPA 13D differed where there are specific floor areas that can remain unprotected and also includes a definition of shadow areas. A future Technical Update will address these changes. The new material added in the 2013 edition of NFPA 13 is A.8.1.1(3) where it states, "Not withstanding the obstruction rules provided in Chapter 8, it is not intended or expected that water will fall on the entire floor space of the occupancy. When obstructions or architectural features interfere with the sprinkler's spray pattern, such as columns, angled walls, wing walls, slightly indented walls, and various soffit configurations, shadowed areas can occur. Where small shadowed areas are formed on the floor adjacent to their referenced architectural features, these shadowed areas are purely on paper and do not take into account the dynamic variables of sprinkler discharge. Examples of shadow areas are shown in Figure A.8.1.1(3)(a) and Figure A.8.1.1(3)(b)" (of NFPA 13). The 2010 edition of NFPA 13 did address this issue for the applicable type of sprinkler in A.8.6.5.2.1.3, A.8.8.5.2.1.3, A.8.9.5.2.1.3, A.8.10.6.2.1.3, A.8.10.7.2.1.3, and A.8.11.5.2.1.3. The existing annex material was carried into the 2013 edition. Thus the concern for shadowing of sprinkler discharge is addressed when following the obstruction rules of NFPA 13. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Residential Sprinkler Requirements by State AFSA receives requests on the updates on states that require residential fire sprinkler systems for one and two family dwellings. The website with that information can be viewed at http://www.firesprinklerinitiative.org [http://r20.rs6.net/tn.jsp?e=001F-J1F_lF0sw9PWNwdgmS9q4hmsugLbDV7LUOcZIKbzVxupWEDH2021RFuFbp57Az0rsOxFRF-cyKjrp-8vKmFDuloti8V0ANhghaimfdvDRH4q61SQGYyhoA5k9KkEJU] and click on Legislation & Adoptions menu for a state by state listing. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ firesprinkler.org [http://r20.rs6.net/tn.jsp?e=001F-J1F_lF0sxLTLUfmD4bGXmde6WR0S4G-LmFAFsG1wGAuOZTryRiZD5D7cioRU7Sm8NrdTrt9-g3rwzsgrYykDZyRaliFsQMmsAabb1VrUoiADdyS9g-8g==] Hosted by the American Fire Sprinkler Association ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Technical Update is prepared by the Technical Services Dept. of the AFSA: Vice President of Engineering and Technical Services Roland Huggins, a PE registered in fire protection engineering; Phill Brown, a NICET IV certified automatic sprinkler technician and NFPA Certified Fire Protection Specialist (CFPS) and Tom Wellen, a PE registered in fire protection engineering. This is provided with the understanding that the AFSA assumes no liability for this opinion or actions taken on it and they are not to be considered the official position of the NFPA or its technical committees. Copyright 2012, American Fire Sprinkler Association. All Rights Reserved ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ PDF Version PDF Link [http://r20.rs6.net/tn.jsp?e=001F-J1F_lF0sx8bUDmzTkNiXlyo0_Ea3XD6uDuZ1xas5M_WBAUPU9pLbtP8fQwG9UqBpuGGxVdLg0T5p6XTaJ4r47g-35lrEhT5U4GmxJoyQkzvlgdHuN6Ge3zmx40J3tgxi6eHbxcGM8IJS1DvGaxn3bUhW5CL_ZFGD34U57Q4QGhFfNvXWaOXStMg4N6pXbigySX_uF37hE=] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Training Calendar AFSA Beginning Fire Sprinkler System Planning School February 25 - March 8, 2013 Check our calendar to view upcoming training. 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