American Fire Sprinkler Association [http://www.firesprinkler.org/] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
AFSA Technical Update ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ A newsletter dealing with codes and other technical issues June 21, 2013 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Sprinklers Above and Below a Ceiling "In roof structures, there is framing where there is sheathing on top of the lower structure with additional framing on top, which requires sprinkler coverage above and below the sheathing. Are both levels of sprinklers required to be included in the hydraulic calculations? Some of the areas below are entirely separated from above by the sheathing where some areas are open to the area above on one or more sides. The sheathing presents an obstruction still requiring sprinkler coverage above and below. Does this make a difference?" We have reviewed NFPA 13, 2010 edition that you indicated as the applicable standard. Our informal interpretation is that only one level is calculated that has the largest water demand. Section 22.4.4.5.5 says that where sprinklers are installed above and below a ceiling or in a case where more than two areas are supplied from a common set of branch lines, the branch lines and supplies shall be calculated to supply the largest water demand. The annex material A.22.4.4.5.5 indicates that when a ceiling is sufficiently open such that sprinklers above and below can be anticipated to activate, additional sprinklers should be added to the calculation. This indicates that sprinklers are included on both levels that create the greatest demand. In actuality, sprinklers do not really behave in this manner during a fire. It could involve two levels but if sprinklers activated under the lower ceiling, the sprinkler above the lower ceiling area are not expected to operate. Thus this statement caused confusion and contradicted Section 22.4.4.6.3 about not calculating sprinklers above and below obstructions. As such, the annex was removed from the 2013 edition of NFPA 13. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ firesprinkler.org [http://r20.rs6.net/tn.jsp?e=001zmL28v4L8MEs0sTo9uQOuec-SMRpbMODsbzFgLpz0iqKvrtaLAysHEEcVTxZdwaOny7CL4V3gd2nBTnYJ2rjyG5rBXyUg07JKQ4NTfQmNjDL7E5_2zUf_1UZvyC0b4cW] 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=001zmL28v4L8MFjrWRO-TA5Tq8ONCtpzxyNxriFVwx4L79BqV4ISfDz-dafX0lxCpaQH9CJvBFTmycRnEVfDVFHaxNkZSTPTBFWjwyNKsZX2Uz23_WZJtHg6M7aL7lwt5eZd9P7f-obqhiP5ChZPg3fSMI4VfCFDgwSATYJGooeb6SXdex7umJSFBZaZNLG80eSvoSD8Ba5E5Y=] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Training Calendar AFSA Beginning Fire Sprinkler System Planning School July 29 - August 9, 2013 Check our calendar to view upcoming training. 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