American Fire Sprinkler Association [http://www.firesprinkler.org/] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
AFSA Technical Update ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ A newsletter dealing with codes and other technical issues June 13, 2014 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Beam Near Wall Creates Pocket "We have a metal building where the end wall has a column 1ft - 10½-inches inside the face of the wall to the centerline of columns which also creates a 16-inch gap from inside face of the wall girts (horizontal structural member) to the inside face of the beam flange. We have a branch line 7 ft - 5 ½-inches from the inside face of the wall and 5 ft - 7 ½-inches to the centerline of the column. The standard response heads will not spray to the wall due to the beam depth in some areas as it varies in depth from 50-inches to 22-inches. Does the 16-inch gap require protection? Where should sprinklers be located down low below the beam or in the 16-inch space within 12-inches from the deck?" We have reviewed NFPA 13, 2013 edition as the applicable standard. Our informal interpretation is that additional sprinklers are required between the beam and the wall. The beam creates a ceiling pocket against the wall. The problem with applying the ceiling pocket rules of Section 8.6.7.2 is that there is a problem with meeting item number 3 that indicates that the entire floor under the unprotected ceiling pocket is protected by the sprinklers at the lower ceiling elevation. The other problem is number 6 where quick response sprinklers were not used. The beam is more of a valance rather than a ceiling pocket. The beam obstructs the sprinkler at the ceiling level where the entire floor area is not protected. Thus additional sprinklers are needed on the other side of the beam. If the sprinklers could be located to meet the obstruction rules of Section 8.6.5.1.2 (Beam Rule), then additional sprinklers would not be needed since the entire floor area would be protected. Confusion can exist between applying the requirements of obstruction against walls (Soffit Rule) and the obstructions to sprinkler discharge (Beam Rule). The advantage of the Soffit Rule over the Beam Rule is that it allows you to locate a sprinkler closer to the wall than what would be allowed by the use of the Beam Rule. Note that to qualify as a soffit, it must have a solid bottom plate. You cannot apply the soffit application to a valance, which will not be enclosed at the bottom plane. If the sprinklers cannot meet either application, an additional sprinkler will have to be installed on the other side of the valance. The beam is too deep in this application to meet the Beam Rule. Next, let's address your concern of shadowing in the corner created by the column. This is a mute point since it appears that sprinklers will be required between the beam and the wall. If you can meet the obstruction rules, you can ignore dry shadow areas created by architectural features. Some material was added to the 2013 edition of NFPA 13 in A.8.1.1(3) that states, "Notwithstanding the obstruction rules provided in Chapter 8, it is not intended or expected that water will fall on the entire floor space of the occupancy. When obstructions or architectural features interfere with the sprinkler's spray pattern, such as columns, angled walls, wing walls, slightly indented walls, and various soffit configurations, shadowed areas can occur. Where small shadowed areas are formed on the floor adjacent to their referenced architectural features, these shadowed areas are purely on paper and do not take into account the dynamic variables of sprinkler discharge. Examples of shadow areas are shown in Figure A.8.1.1(3)(a) and Figure A.8.1.1(3)(b)." Lastly, the sprinklers located between the beam and the wall should be placed according to obstructed construction rules. Steel Purlin Construction is described as obstructed construction in A.3.7.1(8). Although it may be believed the heads will not activate within this narrow space, there is no place in the standard that permits the omission of sprinklers. Your options appear to be 1) install sprinklers between the beam and the wall, 2) install a bottom to seal up the space, or 3) get permission from the AHJ to omit sprinklers between the beam and the wall. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ firesprinkler.org [http://r20.rs6.net/tn.jsp?e=001c7txgrTX5XgH2_xgH1hNuFqOA02EVSvfS2A9PRPnTprtYsTX37s6elQXzITuFZ5Lb4yWEsDeLReP_DtqmqTEXocm63E-PuDAh6WdguIXfKY=] 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 2014, American Fire Sprinkler Association. All Rights Reserved ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ PDF Version PDF Link [http://r20.rs6.net/tn.jsp?e=001c7txgrTX5XgH2_xgH1hNuFqOA02EVSvfS2A9PRPnTprtYsTX37s6elQXzITuFZ5L-AzDRQLr7UIRaUfEfFV7Zvm0eboKmyy-fpDv4IY3qDW2q1DF2Oaqx5Zv1O_KDAlwMlU3ibiyRWlfzPmW_ZviGU1f7RrO-4Kyr9kCbDASpUWaMGsExccngT0PPswakK-ErYX6SKi_YGo=] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Training Calendar AFSA Beginning Fire Sprinkler System Planning School Register for Oct. 13 - 24, 2014 Sept. 8 - 19, 2014 SOLD OUT! July 14 - 25, 2014 SOLD OUT! Check our calendar to view upcoming training. For details and/or to register, visit the AFSA Calendar [http://r20.rs6.net/tn.jsp?e=001c7txgrTX5XgH2_xgH1hNuFqOA02EVSvfS2A9PRPnTprtYsTX37s6elQXzITuFZ5Lb4yWEsDeLRdHdQnuWPrHj0_fOb408axkZdS5kMH-9SUeGZW53qDO1EUx87Rdp9hPJjhLtdjE3zkK1qO6EIen7VTIWpR5PVjC0T5XJTsTAwx5kVKGOQHK6RXUOBEGW70sYyOfaw83Awrclo9OyDgkvIenbCZy6Aa2ks9qJTozB2dz53juPJmA7L6a7bS50U6VHyjFnn6RtwNiDhqZi2d6uw==]. e-campus_logo [http://r20.rs6.net/tn.jsp?e=001c7txgrTX5XgH2_xgH1hNuFqOA02EVSvfS2A9PRPnTprtYsTX37s6elQXzITuFZ5Lb4yWEsDeLRfSH2pFRZbZudfrfP4OWClNdc_i3Uk91danWwKQyg8QyQ==] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ AFSA Webinar NFPA 25, 2014 Edition by Russ Leavitt June 19, 2014 This webinar examines not only the significant revisions that occurred and the reasoning behind the changes, but also proposals that were rejected by the Technical Committee. Cost is FREE for AFSA members. 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