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American Fire Sprinkler Association [http://www.firesprinkler.org/] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ AFSA Technical Update ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ A newsletter dealing with codes and other technical issues May 25, 2012 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Hanging Pipe from a Single Joist "I had several AHJ's mandating that I not support large piping off a single joists. They require trapeze to span two joists if supporting piping larger than 2-1/2 inches. I don't see anything in NFPA 13 specifically requiring this. NFPA 13 requires to trapeze "where necessary". Can I support pipe from a single joist?" We have reviewed NFPA 13, 2010 edition as the applicable standard. Our informal interpretation is that joist must be sized adequately to support the load from the pipe. There are variables that must be considered when supporting pipe from the building structure or as in this case, support of piping from a single joist. The annex for A.9.2.1.3 indicates that the method used to attach the hanger to the structure and the load placed on the hanger should take into account any limits imposed by the structure. Design manual information for pre-engineered structures for other specialty construction materials should be consulted, if appropriate. System mains hung to a single beam, truss or purlin can affect the structural integrity of the building by introducing excessive loads not anticipated in the building design. Also, special conditions such as collateral and concentrated load limits, type or method of attachment need to be observed when hanging system piping in pre-engineered metal buildings or buildings using other specialty structural components such as composite wood joists or combination wood and tubular metal joists. So with that annex information, there is no set parameter indicated in NFPA 13 what pipe size can be supported from a single joist. The loads from a large water-filled pipe should be communicated back to the engineer of record on the project. When it's determined that the structural member cannot support the pipe loads, then Section 9.2.1.3.2 is applied. This section indicates that trapeze hangers shall be used where necessary to transfer loads to appropriate structural members. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ firesprinkler.org [http://r20.rs6.net/tn.jsp?e=001EmrQmdn0gsYR2vmczV2VhFGDCoQUkTxsxzhUOP-s6EVGiNfkLmgSdeCX--FWmfqDy-zOauOJoKJUU0l4eAwC1eh5bsK-TToZ2PDeb3tqkWKmu7Ytj5cPmQ==] 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=001EmrQmdn0gsaDi_bmWZlA_dajRombhQauvWvitclEzRdLZCTLzAhyHWsOCDh5bX5DtIqcz6bUYlSGKVBNGYCC4wAK3XBcCiG-fx6UfGg81iztfM588oyFntgIjShSDrv34ZewrjNH9jdxDoMxFPkxtj7B_P4oIp_4EUjrz-_VmzI3vJ83MknIuHcUEdx7SAo39tpqc48MTWs=] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mark Your Calendar! AFSA Webinar Michelle Knight and Jeff Gibson to Present an AFSA Webinar on "CPVC Compatibility & Applications Update" May 30, 2012 Free to AFSA members! 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