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December 21, 2015 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Roof Outlet Piping Arrangement "In Figure A.7.3.2(5), a non-rising stem gate valve is depicted. Is the depicted control valve required in areas not subject to freezing conditions? Where are the requirements for this control valve being installed in this standard?" We have reviewed NFPA 14, 2013 edition which you indicated as the applicable standard. Our informal interpretation is that the control valve is not needed if the application is not subject to freezing conditions. Figure A.7.3.2(5) is an example of an arrangement for piping a hose outlet to the roof. This is not intended to require this exact piping arrangement for every hose outlet located on a roof. For example, some buildings have stair access to the roof. The outlet(s) is located either within the stair tower or on the exterior wall of the stairwell. A control valve is added so the piping exposed to freezing conditions can be isolated and remain dry. If needed, a ball drip is added to remove any residual water from the piping. The control valve is not desired in areas not subject to freezing. An arrangement without a control valve would actually expedite firefighting operations since the hose valve would be charged with water. Regarding the control valve for the roof outlet, the references in Section 6.3.2 and 6.3.3 do not specifically address the control valve for the roof hose outlet. Section 6.3.2 states, "Valves shall be provided on all standpipes, including manual-dry standpipes, to allow isolation of a standpipe without interrupting the supply to other standpipes from the same source of supply." This is for a valve typically at the bottom of the standpipe as it relates to the supply main. Section 6.3.3 states, "Listed indicating-type valves shall be provided at the standpipe for controlling branch lines for remote hose stations." The roof hose valve is not typically considered a branch line since the piping extends vertically through the roof where Section 6.3.3 would not be applicable. On a side note, a proposed change is added for branch lines in Public Comment No. 5 that states, "Listed indicating-type valves shall be provided at the standpipe for controlling branch lines where the distance to the remote hose station exceeds 40 ft measured along the pipe." <a href="http://files.ctctcdn.com/66430f6a001/e85666b8-049d-4c68-9346-de1f7488669d.pdf"; track="on" >Click here for PDF Version</a> <a href="https://www.firesprinkler.org/technical-services/subscribe-technical-updates/"; track="off" >Archives</a> 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 2015, American Fire Sprinkler Association. All Rights Reserved ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ AFSA WEBINAR PROPOSALS Do you have an idea for a training presentation benefitting AFSA members? Submit your training proposal for consideration as an AFSA webinar. AFSA webinars are usually 90 mins in length and are educational in nature (as opposed to product or service endorsements). If you would like to share your knowledge and expertise that would benefit fire sprinkler contractors nationwide, please submit your idea for consideration. 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