American Fire Sprinkler Association [http://www.firesprinkler.org/] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
AFSA Technical Update ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ A newsletter dealing with codes and other technical issues May 29, 2014 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Vertical Turbine Pumps and Tank Volume "With regards to the priming level for vertical turbine pumps, is the lowest water level as indicated in Fig A.7.2.2.1 considered "unusable" in considering the total water volume as determined by the system demand?" We have reviewed NFPA 20, 2013 edition as the applicable standard. Our informal interpretation is that the lowest water level allowed would be indicated by the vertical pump manufacturer that publishes the minimum submergence requirements to prevent surface vortices. NFPA 20 provides guidance for well pits and wet pits and vaguely addresses water storage tanks. The commentary under 7.2.1.1 states, "The minimum water level required for vertical turbine pumps to draw suction must be considered for aboveground and belowground tanks. Generally, a suction pit needs to be constructed below the tank, so that the total capacity of the tank can be used by the pump. The depth of the suction pit depends on the minimum submergence required for the application." If there is no suction pit below the level of the bottom of the tank, there is a volume of water that is not usable. The commentary under Section 7.2.2 says that pump manufacturers publish minimum submergence requirements to prevent surface vortices. In addition, the Hydraulic Institute has published minimum submergence guidelines for vertical turbine pumps in the Hydraulic Institute Standards for Centrifugal, Rotary & Reciprocating Pumps. This minimum submergence is intended to prevent surface vortices only and is not intended to prevent cavitation. As such, there is no specific guidance regarding specific distances for the water level heights. The manufacturer of the pump will provide the required submergence level for the pump and one will have to decide the safety factor above that for determining the required water volume of the tank. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ firesprinkler.org [http://r20.rs6.net/tn.jsp?e=001UgsRu_unkac7jFWi2i0h0wJNP0NLd00qx0GrqPeg_6kbTCTOHRQKUYTLdYk0sr45BPBOXOoAJuVW31yjCFRdd8vUfUpD7_iK74ovDlTJbmc=] 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=001UgsRu_unkac7jFWi2i0h0wJNP0NLd00qx0GrqPeg_6kbTCTOHRQKUYTLdYk0sr45CWxcA5dipGEaBXy2X3EbiHDndVlsx_8tYz61jlR5HhNQnrd8h5O5xnIOi_3GfCCXVXsEoyM0BV1TEys3DFDITlU27B6ToY7yUoDEchJuUMa00ElwTjwFjNWXXwbOvRFZSt_C1w--kUw=] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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=001UgsRu_unkac7jFWi2i0h0wJNP0NLd00qx0GrqPeg_6kbTCTOHRQKUYTLdYk0sr45BPBOXOoAJuWvU9itSxtLALhZuua2ywqkpXb8H0wm0edVPoflxQW0lfwukCRnrm46wGV_3O2iSgf-dBBopwQmEBhzvdy6wqYBNd8LpevdNtMGkiS_gSTJu1SfonUAlnGWJtDWeWEa9ghMJBC9vzFoDZgazqpjgpiPNIfXSViKbd5PoKztVe2YAaE_EOhrbIYXZU1YGYMKpbPGlh_AjEanjw==]. e-campus_logo [http://r20.rs6.net/tn.jsp?e=001UgsRu_unkac7jFWi2i0h0wJNP0NLd00qx0GrqPeg_6kbTCTOHRQKUYTLdYk0sr45BPBOXOoAJuWAhT4Q3pKGt1gGZGZKFN8Ilo7xsRABKRr8DJ50jO8agA==] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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. Register Button [http://r20.rs6.net/tn.jsp?e=001UgsRu_unkac7jFWi2i0h0wJNP0NLd00qx0GrqPeg_6kbTCTOHRQKUYTLdYk0sr45BPBOXOoAJuVW31yjCFRdd8vUfUpD7_iKkLrbY2wLOkN027rh1Uo7MHu1ep_Hgq_bWKAnttvsBYdRAzc_EDwGuoNTwU9WQ46v] This seminar offers 1.5 CPD and 0.15 CEU.* (*Note: There is a fee of $15 to acquire the CEU credits. The webinar/content is being given free, but the CEUs will have a fee.) Check our calendar to view upcoming training. 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