Well I look at it this way. If you used the curves and factored the value up by an additional 15 - 20% you should be fine considering the mantra is that most fires are controlled by only 1-3 sprinklers not the entire calculated hydraulically remote area. But, if the committee believes it should be done a certain way then put it in black and white and eliminate any confusion and guessing.
Craig Prahl | Jacobs | Group Lead - Fire Protection | 864.676.5252 | [email protected]<mailto:[email protected]> | www.jacobs.com<http://www.jacobs.com/> From: Sprinklerforum <[email protected]> On Behalf Of Roland Huggins Sent: Monday, March 25, 2019 2:03 PM To: [email protected] Subject: [EXTERNAL] Re: Water Tank The NFPA 13 committee believes the tank size is indeed based on the CALCULATED volume of water. I know this because I attempted several cycles ago to state we should simply use the curves with a modifier. I was almost burned at the stake for uttering such blasphemy. Roland Roland Huggins, PE - Senior VP Engineering American Fire Sprinkler Assn. Dallas, TX http://www.firesprinkler.org<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.firesprinkler.org_&d=DwMFAg&c=OgZOSER8c1RLeytEexU279Q2qk0jVwkrOdYe5iSi-kk&r=_w721WvezJkWUVteY4FMhecHAoDqOn85ooHi6vIkMag&m=LSitVO9kRtffCU2_Kq1AFwMHMwU4R9POZX1mHsm-XJo&s=ECrKtTShUpl6Us21CbW8dwSOVQYGFhIkaRkmw0MtKKQ&e=> Fire Sprinklers Saves Lives On Mar 20, 2019, at 7:48 AM, AKS-Gmail-IMAP <[email protected]<mailto:[email protected]>> wrote: Tank sizing for some situations presents an uncomfortable dilemma because there are pressures from all sides to minimize the tank size yet we all know the tank contains the single most important item. Some codes can be argued to say the size is for sprinkler demand only. The code might also qualify that by implying the actual system calculated sprinkler demand is used for sizing. So in this case the OH-2 system might have a 1.8 overage at its most demanding location. But then what happens if the fire event occurs at the least pressure demanding part of the system where the overage is higher than 1.8? Here we can only hope that more water in less time is better and perhaps not so many sprinklers open and someone is present to manage the run time. The same pressures to limit the tank size might also work against installing a more water efficient sprinkler system for that OH-2 space. ________________________________ NOTICE - This communication may contain confidential and privileged information that is for the sole use of the intended recipient. Any viewing, copying or distribution of, or reliance on this message by unintended recipients is strictly prohibited. If you have received this message in error, please notify us immediately by replying to the message and deleting it from your computer.
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