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American Fire Sprinkler Association [http://www.firesprinkler.org/] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ AFSA Technical Update ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ A newsletter dealing with codes and other technical issues November 21, 2012 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Trapeze Hangers and Shared Support Structures The 2013 edition of NFPA 13 has some new information regarding shared support structures and trapeze hangers. There are times where the support of system components are desired to be combined other trades. This was generally not permitted in NFPA 13 until the 2013 edition where the sprinkler system component supports can be shared in transferring the loads to the building structure. A shared support structure can be in the form of a pipe rack structure, a trapeze assembly, pipe stand, or other similar assembly. Storage racks are not considered to be a shared support structure. Section 9.1.1.3 provides the new guidance. A registered professional engineer shall certify the shared support structures in accordance with Sections 9.1.1.2 and 9.1.1.3. There are two options for design: 1) The sprinkler pipe and other distribution systems shall be permitted to be supported from a shared support structure designed to support five times the weight of water filled sprinkler pipe and other supported distribution systems plus 250 lb, based on the allowable ultimate stress; or 2) The sprinkler pipe and other distribution systems shall be permitted to be supported from a shared support structure designed to support five times the weight of the water-filled sprinkler pipe plus 250 lb, and one and one-half times the weight of all other supported distribution systems. This new material also clarifies that the building structure shall not be considered a shared support structure. The shared support structures do not apply to flexible sprinkler hose fittings or ceiling systems according to Section 9.1.1.3.1.4. The systems that are incompatible with the fire sprinkler systems based on vibration, thermal expansion and contraction, or other factors shall not share support structures. As indicated above, a trapeze assembly can be used as a support structure. The new changes to for the trapeze hanger tables were not based upon the requirements of shared support structures. The spans for trapeze members were expanded from 10 ft up to 16 ft. Otherwise, the spans that exceeded the tables for the section modulus required for trapeze members required further analysis. The spans were also changed from 1 ft to 6 in. increments. The table was split to provide separate tables for the nominal diameter of pipe being supported for Schedule 10 and Schedule 40 pipe to reduce confusion. The 2010 edition table had two values provided for each span where the top values were for Schedule 10 pipe and the bottom values were for Schedule 40 pipe. The annex for the new trapeze table indicates that the values are based on single continuous trapeze members. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ firesprinkler.org [http://r20.rs6.net/tn.jsp?e=001oDG2tQm14YyNR7L6R4Dqwb7Ev5ZwXG1pT2wisHyCU77s3UZ_IkGULhPse3cvzTqCloBVK4A87UwQVLdxGpeUDp00UIhTZO4ferNKQin8f8Zuy2J1ycsW1A==] 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 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Download the PDF Version of Technical Update PDF Link [http://r20.rs6.net/tn.jsp?e=001oDG2tQm14Yydt9troM98w0vWBSFtyedONkEy27VEPhMy7vcKbkvdtnkf3jhPhJ7AA21QLELfkoQZ5pOEhXuhOp8-lGhA2l1xE_fJ1bgQv8z1_QjlOs5nDz8JS4eA69BTo2gjVsKuf-oPcUQbn4BnUepNkniD_OEiasVv5So4al9zmEA9y_eV8kJ3y7lA21rgmWLoW7bDFXI=] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Training Calendar AFSA Beginning Fire Sprinkler System Planning School January 14 - 25, 2013 Check our calendar to view upcoming training. For details and/or to register, visit the AFSA Calendar [http://r20.rs6.net/tn.jsp?e=001oDG2tQm14YyupAC-Bko0Y4wU0n-3Vj2oPn8tWFHgoKN9vWIAKK4kExZyI5HLugWEVxbwYekZLEWzUSNOOj_dk3Id6LNjktVg8GpB10LRXXGMKDzAsQaKqX4VThSzTE0hvzPcKfnWUozka6sK2QiEkV3q80mxGLOJRlaGbwHA2Uz9fOW0PSQKoHLnF_hkZA1_J1jq0NklTQvPPZbZZk7gvxGqsFjFRM-Z9cz2PqvCRxADhMcyHYO4XsG5PH4_pKjhAxtA74ovxX1MjvqF6V0_EcgRTzALRxf-]. e-campus_logo [http://r20.rs6.net/tn.jsp?e=001oDG2tQm14YxSUqoTntmg-nbf_cyGMsErtHttfzgQIms6XRL_LV91PPSzPy05GFVHEU2jKGygyLTVNfPDQX_nd9FT69_9hfZSlS2DSn3SD1it-sbxA2IcoKecM5PDsHs4] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Antifreeze TIAs TIAs on NFPA 13, NFPA 13R, NFPA 13D, and NFPA 25 on antifreeze issues. 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