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American Fire Sprinkler Association [http://www.firesprinkler.org/] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ AFSA Technical Update ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ A newsletter dealing with codes and other technical issues January 4, 2013 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Listed Load Rating of a Hanger Component "A 4-inch Schedule 10 pipe will equal 11.78 lbs./ft (water filled) times 12 feet long will equal 141.36 lbs. Multiply that times five equals 706.8 lbs. plus the 250 lbs. equals 956.8 lbs. total weight. The attached beam clamp data sheet shows a maximum load of 500 lbs. Most of the beam clamps have similar ratings. Does this mean that beam clamps cannot be used?" We have reviewed NFPA 13, 2013 edition as the applicable standard. Our informal interpretation is that listed hangers are selected simply by pipe size and not the calculated weight. The base requirement in Section 9.1.1.5.1 is that components of hanger assemblies that attach directly to the pipe or to the structure shall be listed. The weight of the water-filled pipe plus 250 lbs. does not have to be figured since that weight was already addressed during the listing process of the hanger components. Thus you select the listed component based on the size of the pipe. The attachment to the structure is usually made at the top since it usually supports more weight. Note the data sheet indicates a load rating of 500 lbs. when attached to the top of the structural member (bar joist or beam) and only 250 lbs. when attached to the bottom of the structural member when using a 3/8 in. rod. The difference in the load rating for this component may have to do more with the orientation of the clamp attachment rather than the structural member. A steel I-beam of substantial size can support more weight than 250 lbs. so the limiting factor is the method of attaching the hanger component. When the manufacturers design the attachments to the pipe or structure, there are requirements as part of their listing for hanger components to support higher loads than the listed load ratings. When a component shows a listed load rating of 500 lbs., the component was likely designed to support 2,500 lbs. and divided by five for that published load rating. These are known as safety factors commonly applied in engineering. We see this in Section 9.1.1.2 that if the hanger is engineered, the hangers shall be designed to support five times the weight of the water-filled pipe plus 250 lbs. at each point of piping support. So, an engineered support has safety factor of five. Note that there is no mention in Chapter 9 that the structure at the point of attachment has to support five times the weight of the water-filled pipe. That only applies to engineered hanger components in Section 9.1.1.2. Section 9.2.1.3.1 says the sprinkler piping shall be substantially supported from the building structure, which must support the added load of the water-filled pipe plus a minimum of 250 lbs. applied at the point of hanging. When these requirements were first written, the idea was and still is that everything else will fail before the fire protection system fails. The 250-pound load referenced above represents the extra stress imposed by system installation, future construction activities, and physical impact from equipment. Thus, hangers for sprinklers will continue to be designed for larger loads than other system's hangers since sprinklers provide life safety and property protection. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ firesprinkler.org [http://r20.rs6.net/tn.jsp?e=001LuInoYkQhDen2235R_xhjmhKCUN4-smiIz-GXJ3GecvVQcgkBKffk7RZZOs6TInH0b7mH7uW3_nRygHr_qaYu4J7_iTYlkLBml19LwsS-Kz1f6U7GxCcHA==] 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=001LuInoYkQhDc5rCvSqhS-ipssmyCNKgAf_48G7R2f_UloO0wfa3VArCIIgKEHaqcboTjpnoMKmdMZLbCay1O7VK8YYIexasskC68ZrBFl7dQTanKUZd-DFkfS53_hJ03toDAhZpIjPe_5qkoROM7N9t_AZ2zt_6AWXVB1c3tKP7qukllkLtvxT5CNmyfLQc6cq0f5kE0SDP0=] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Training Calendar AFSA Beginning Fire Sprinkler System Planning School January 14 - 25, 2013 Check our calendar to view upcoming training. 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