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American Fire Sprinkler Association [http://www.firesprinkler.org/] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ AFSA Technical Update ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ A newsletter dealing with codes and other technical issues July 20, 2012 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Wrap-around U-type Hook "The requirements of 9.3.5.3 shall not apply where U-type hooks of the wrap-around type or those U-type hooks arranged to keep the pipe tight to the underside of the structural element shall be permitted to be used to satisfy the requirements for lateral sway bracing... The question is if the piping is supported on top of the bottom leg of truss (instead of hung from the bottom of the truss) - essentially creating an inverted U-type hook installation with the "U" portion pointing upwards vertically. Would this arrangement be acceptable to satisfy the requirements for lateral sway bracing?" We have reviewed NFPA 13, 2010 edition as the applicable standard. Our informal interpretation is that the U-hook can be used in an inverted orientation if the pipe is tight to the structure. Wrap-around type or U-type hooks were designed to support piping to be suspended below structural members. The U-type hook hangers were not intended in an inverted orientation to suspend pipe above a structural member, leaving a space between the pipe and structural member. The wrap-around type and U-type hooks can be used in accordance with Section 9.3.5.3.10 as an exception for lateral sway bracing. This section requires the U-type hook to be arranged to keep the pipe tight to the underside of the structural element. The wrap-around U-type hook will allow space between the pipe and the structural member. Your application is opposite where the pipe is on top of the structural elements with the wrap-around U-type hook inverted and attached to the structural member to support the piping. The concern is installing the U-type hook in an inverted orientation. This hanger would have to support the weight of the water-filled pipe above the structural member. The eyelet of the U-type hook may slip out from the fastener. As such, this would not be considered acceptable. If the pipe rests on top of the structural member, the eyelet slipping out from the fastener is not likely to occur. Given this orientation, the loads imposed on the U-type hook may actually be less than the arrangement indicated in Section 9.3.5.3.10. The structural member supports the weight of the water-filled pipe and not the U-type hook. An alternative would be to provide blocking that is attached and secured between the structural member and the pipe. As such, the inverted U-type hook orientation would meet the intent of NFPA 13 if the pipe rests on top of the structural member and it's installed according to the remaining requirements of Section 9.3.5.3.10. The forces placed on the U-type hook in this orientation would be no different, if not less than that described in Section 9.3.5.3.10. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ firesprinkler.org [http://r20.rs6.net/tn.jsp?e=001hyUV9d59UsHQr9STipBMWo-JHx1KHz-cAFi5MGc7HIKTcvLdFMD0niMkv48g1CexzBoOEZ-E6C9FGzI0qXpuH1mgqr41NdH-_eFF5sZ6n-I14i5_JDmUMA==] 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 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Printable Copy PDF Version [http://r20.rs6.net/tn.jsp?e=001hyUV9d59UsGepSO-xOxCqyMoE2WCHz9VD07yyxXaRmucSVerbwNaY5d-fY4Ivu3-jtU2gONfEMouLZeJ0BhX9Y535oDa-dnIyTjn0bMCkxbOZgFKCe3DCU3M_Qry5jgRBpObaxsx2ONC0m_3VBW1GXCBng01PmXQJEfq3sfTlSqMSHVtCe2WWT7WH6LQJUgx1iv0ZZjTJKk=] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mark Your Calendar! 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