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American Fire Sprinkler Association [http://www.firesprinkler.org/] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ AFSA Technical Update ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ A newsletter dealing with codes and other technical issues November 30, 2012 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Raw Water Source "A well water source has been tested and it has no sediment. Is water from a well considered a raw water source thus requiring return bends for drops?" We have reviewed 2013 edition of NFPA 13 and 13R as the applicable standards. Our informal interpretation is that water from a well that is a closed type system would not require return bends for drops. The water from the well is not treated and can in a sense be considered a raw water source. However, the intent of NFPA 13 is to prevent the accumulation of sediment in drops of a system. Water wells that are closed systems contain little to no sediment since the earth is a filter and many are considered potable drinking water supplies. The water has been tested where no sediment was found thus there is no requirement for return bends on the sprinkler system. The open well types create a larger concern where it would be considered no different from a pond or open-top reservoir. Return bends would be required for rivers, ponds, open-top reservoirs, and open-top wells where they could contain excessive sediment. New definitions are now in the standard for raw water source. Section 3.3.19 of NFPA 13 indicates that a raw water source is a water supply that has not been treated and could contain foreign material that could enter the sprinkler system. The annex for this section clarifies examples of raw water sources as millponds, lakes, streams, open-top reservoirs, and so forth. Examples of non-raw water sources can include city water supplies, cisterns, pressure tanks, gravity tanks, break tanks, aquifers, and so forth. Water sources that are closed or protected from direct contact with the environment should not be considered raw. NFPA 13R in Section 3.3.8 has a slight variation in wording for a raw water source as a water supply taken from the environment that has not been treated and could contain foreign material that could accumulate freely and enter the sprinkler system. The annex in NFPA 13R is the same wording as NFPA 13. This should clarify when return bends are needed for sprinkler systems. On a side note, NFPA 13 also added a new Section as 8.15.19.5 that return bends shall not be required for wet pipe systems where sprinklers with a nominal K-factor of K-11.2 or larger are used. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ firesprinkler.org [http://r20.rs6.net/tn.jsp?e=001FxD4l6c6TfgCJ7EjkOjdv-GuXtUYS-qfNrVtOE2TeFHe0n_QMQLC6daTZG48xr7XRC-JK6n_BV4JEgFjgcthSHjiVdh0izfLNYt97Ma7eDSTWE8gbjELgQ==] 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 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Download the PDF Version of Technical Update PDF Link [http://r20.rs6.net/tn.jsp?e=001FxD4l6c6TfiWOrPysva_iAabmi-2B3zM50suAfncKAAg0uBnGYkHCMa4TwFGRjhZ_kb8GrLFiw3ZXGqhz-sagtjfpJYOYWr-DVJMYkqUzEVLpTFtwTfZLY1IRgdkaqeUCiltMLEc-6k_4g0Vidd7aLvtwJCdQRAtM1vG7p2nwmU7KFKo503w3p0BxtEQ3BprXjjS1yDFwLQ=] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Training Calendar AFSA Beginning Fire Sprinkler System Planning School January 14 - 25, 2013 Check our calendar to view upcoming training. For details and/or to register, visit the AFSA Calendar [http://r20.rs6.net/tn.jsp?e=001FxD4l6c6Tfh3Y4ppi7KPrd23UkFPGUEGEpnDMZ0nU3_cB1baZ_c5Rr4LxBBDMbfDdkDAprubHEdYLT-9lliIezmhhzdxALCTxwtUsYawpR0wumL-L89lazSjMYlzQmH4n3Ja1u79Gq-7wi_yz5y5cRMYjB-_-GtCqcIsXB-X1Yh40n4N4U6ZPOjaBobIJLH5BUD4pc22RU135jlCYXn4L06ZR7OitGirSLtHnWXLr5F0QpmwqD5poKo7gvXJlb0XO3FFGBTfQy96Xeujc7NewMIvovEqstS9]. e-campus_logo [http://r20.rs6.net/tn.jsp?e=001FxD4l6c6TfhBTXtzZp_XJD43yVPdOrruMjfH6Q-6c146NthRmwFzIObyWDPhoetwIjsgwPmLCJToSIMNHsvvc3lCZiDg8OmQlauiKtGMs10hErIbObgvQ4BC1AXkE3mp] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Antifreeze TIAs TIAs on NFPA 13, NFPA 13R, NFPA 13D, and NFPA 25 on antifreeze issues. 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