To me, the intent is to have the fire pump operating anytime a sprinkler is operating. We do not want to short cycle the fire pump. My suggestion is always for manual shut-down unless the site is unmanned and response to Technical he site would take considerable time.. A properly designed and maintained fire pump system can operate at churn or near churn conditions for a lengthy time with no issues.
*The above is my opinion and has not been processed as a formal interpretation in accordance with the NFPA Regulations Governing Committee Projects. 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 **AFSA, and/or NFPA or its technical committees.**AFSA cannot provide design or consulting engineering services, and this opinion should therefore not be considered, nor relied upon, as such.* Thanks, John John August Denhardt, PE *Vice President, Engineering and Technical Services* *American Fire Sprinkler Association* m: p: 301-343-1457 214-349-5965 ext 121 w: firesprinkler.org <https://www.facebook.com/firesprinkler.org/> <https://twitter.com/afsa/status/1039528345367732224> <https://www.linkedin.com/company/american-fire-sprinkler-association-afsa-/> <https://www.instagram.com/firesprinklerorg/> *Our members are at the heart of everything we do.* *Are you a member with a technical question? * Don't forget one of the most valuable resources that American Fire Sprinkler Association provides is technical reviews from our Engineering & Technical Services Department. It’s like having an FPE on your staff. Visit www.firesprinkler.org/interp <https://www.firesprinkler.org/WWW/Contacts/Sign_In.aspx?WebsiteKey=3dff22a3-0306-479c-bccc-7aa1986c8ada&LoginRedirect=true&returnurl=/WWW/Technical_Services/Informal_Interpretations/WWW/Informal_Interpret/Member_View.aspx?hkey=8023e65f-a2ad-4465-9920-0f9313a07324> to submit a question today! On Thu, Nov 18, 2021 at 2:27 PM BF Blake via Sprinklerforum < [email protected]> wrote: > Greetings Forum Members > > Do we believe it is the intent of NFPA 20 TC is for 10 minute automatic > shut down (when enabled) of fire pumps to apply only during churn (e.g. > dead head, closed loop, testing) conditions or to any condition to include > sprinkler flow (e.g. 1/2" 5.6K ITC flow)? > > Is the intent to protect the fire pump from "burn out"? Is the intent to > run pumps to failure (destruction) or is the intent, with 10 minute auto > shut down, where permitted, to attempt to preserve the pump? > > Thanks > > Byron > NATO Facility > UFC Criteria 03-600-01 (2013) Applicable > Słupsk, Pomorskie, Poland > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
