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American Fire Sprinkler Association [http://www.firesprinkler.org/] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ AFSA Technical Update ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ A newsletter dealing with codes and other technical issues August 9, 2012 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Antifreeze Loop "We are dealing with an antifreeze system that protects a cooler and freezer that are located on the exterior of the main building (standalone boxes). The piping is fed from a wet system and the antifreeze loop is installed correctly. The antifreeze system piping passes from the interior of the heated main building, into the cooler, and then into the freezer. We are getting severe condensation on the outside of the piping in the cooler space, and this is creating a slip and fall hazard for the customer. The penetration between the cooler and freezer appears to be properly sealed, but since the cooler is in service, it is difficult to examine or reseal the penetration property. There is no condensation issue between the cooler and the heated main building at all. The frost line after the cooler/freezer wall penetration is at least 3 ft long with solid ice formed around the coupling. Is there anything from a code standpoint that could be done to alleviate this problem or issue?" We have reviewed NFPA 13, 2010 edition as the applicable standard. Our informal interpretation is that this is a heat transfer issue and not an NFPA 13 issue. This is an interesting problem that is not addressed by NFPA 13 since the system is fine but it presents a potential slip hazard. The problem is that the antifreeze solution is basically the same temperature on both sides of the freezer wall. I suspect there is not a problem with the seal since air is usually pulled into the freezer (due to the lower temperature creating a reduction in pressure within the freezer). The cold solution is causing condensation in the cooler that then freezes. I would think the manufacturer for the freezer would have encountered this issue and may be able to provide a definitive solution. The likely solution will be heat tracing and insulation. Insulation alone may be enough depending on the temperature of the freezer. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ firesprinkler.org [http://r20.rs6.net/tn.jsp?e=001ACi3sHoXiUElOlPYuUhY48cQnVab4dt0OQSVM6MV-bwQE3FPGLHQ4hexUAjiHLxL5BcbmVvhWoRxDBYrkIfkE3WxXEysr6lTZe-nrFIYY-RFeqiHJDyMwQ==] 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=001ACi3sHoXiUEXTPdII97VB4x435f56S9GG0OU15RG9U2HLVoLXQTKU1bTWnX9AZvXImQN7ll1W-lhzji-kgmj7qhiXCP4KuS9M8rVu1l8VYT8sQnJu0jdR8MOmBXVAxZ1IELDjgHp9Job7o-P0c_MhMXhV_euJkIu9qxRM2DCLhhpYscvBktL89ZifkPH6pINpS7Ftg8pKHk=] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mark Your Calendar! 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