Well Okie Dokie then. 99% of the time I am just estimating tank capacity since we’re not providing final calcs. But that estimate typically is on the conservative side of what the final calcs usually end up requiring. Plus when having to provide for Fire Flow, the tank sizes will always exceed what the sprinkler demand requires.
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 4:40 PM To: [email protected] Subject: Re: [EXTERNAL] Re: Water Tank But they HAVE said that. Start with 11.1.4.1 - the water demand shall be determined (occupancy hazard approach etc) Staying with the occupancy hazard approach (to minimize the number of referenced section), section 11.2.1 - The water demand requirements shall be determined by either pipe schedule or hydraulic calculation method. Section 11.1.5.2 tanks shall be sized to supply the equipment they serve. Since the tank is the water supply that must meet the system demand, then there you go in black and white. 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=DwMFaQ&c=OgZOSER8c1RLeytEexU279Q2qk0jVwkrOdYe5iSi-kk&r=_w721WvezJkWUVteY4FMhecHAoDqOn85ooHi6vIkMag&m=A1aSZLxw_0z8oJjzXuv2Hyny-XXah9O6aXha2-X5gC8&s=q8QWKnv9OL33pzKnOtvcWM9AY528GeHcwnbubo4N5yc&e=> Fire Sprinklers Saves Lives On Mar 25, 2019, at 12:17 PM, Prahl, Craig/GVL <[email protected]<mailto:[email protected]>> wrote: 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]<mailto:[email protected]>> On Behalf Of Roland Huggins Sent: Monday, March 25, 2019 2:03 PM To: [email protected]<mailto:[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. 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