This section has been in since 2013 and it has caused some issues.
If you are doing room design and meet the requirements for room design then you are done. If you are doing density / area and you only have 1000 sq ft, where the required design area would be 1950 sq ft, then as I understand it, you have to get the flow to a minimum of 195 gpm. This comes into play on exterior overhangs and small preaction areas and such like that. It can be a real pain. I've also had this come up on paint booths. The booth is EH2, so 04/2000 or 800 gpm. If we only have 6 sprinklers, we may only flow 250 gpm, but we have to add 550 to the cross main to get to 800 gpm. It really hurts. <http://www.mfpdesign.com/> Travis Mack, CFPS, CWBSP, RME-G, SET MFP Design, LLC 3356 E Vallejo Ct Gilbert, AZ 85298 480-505-9271 fax: 866-430-6107 <mailto:[email protected]> [email protected] www.mfpdesign.com Send large files to us via: <https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.highta il.com%2Fu%2FMFPDesign&data=02%7C01%7C%7C1121d49f9e6b4cf248f108d4df580e77%7C 14e5497c16da42e69ffa77d19bafe511%7C0%7C0%7C636379016677342180&sdata=eGdMZGu2 wXhUupGwgGTrqF3b54OP5%2BAZvlHhABSexWY%3D&reserved=0> https://www.hightail.com/u/MFPDesign LinkedIn: <https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.linked in.com%2Fin%2Ftravismack&data=02%7C01%7C%7C1121d49f9e6b4cf248f108d4df580e77% 7C14e5497c16da42e69ffa77d19bafe511%7C0%7C0%7C636379016677342180&sdata=tT5E7L sZjSmyreKi4gDCa70EWN%2BZodi%2FhbeCbHNRijI%3D&reserved=0> https://www.linkedin.com/in/travismack "The bitterness of poor quality remains long after the sweetness of low price is forgotten." From: Sprinklerforum <[email protected]> On Behalf Of Steve Leyton Sent: Monday, April 22, 2019 3:19 PM To: [email protected] Subject: Intent of 23.4.4.2.5 We have a building with fire rated and secure compartments that are less than the NFPA 13 minimum design areas so we have calculated those areas using the room design method where the compartments comply. Two are fire protected with preaction sprinklers and 23.4.4.2.5 seems to imply that where a design area is flowing less than what the density would be across the minimum required design area, then a "kicker" needs to be added to raise the flow rate to that figure. Since we're in Light Hazard and the design area is only about 1,000 sq. ft., we're flowing about 150 GPM. But they're coming after us for 1,500 x 1.3 = 1,950 saying the required flow rate is 195. If it's LH, we can downward adjust and the demand drops to 117 which we satisfy. In all my years I've never had this section thrown at us so could use any help or opinion regarding exactly how this section should be applied.
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