Hi we flow switch and relay to isolate the sprinkler if there is a demand -----Original Message----- From: Travis Mack <[email protected]> To: sprinklerforum <[email protected]> Sent: Fri, Aug 18, 2017 11:16 am Subject: Re: NFPA 13D - Adding 5 gpm Domestic Flow in Calculations
Yes. We do have some authorities that mandate it. But it is still above the minimum requirements of 13D. I always thought it was odd. But there are many things some authorities require that I feel are odd. Ha ha. Travis Mack, SET MFP Design, LLC "Follow" us on Facebook: https://www.facebook.com/pages/MFP-Design-LLC/92218417692 Send large files to MFP Design via: https://www.hightail.com/u/MFPDesign Sent from my iPhone On Aug 18, 2017, at 7:39 AM, Parsley Consulting <[email protected]> wrote: I believe the mandate for a 5 gpm addition for domestic demand was added for single family homes by some jurisdictions as a rule of thumb quite some time back. And, to put a fine point on it, Owen, it's state law in California, so yes you certainly are required to add 5 gpm flow for domestic if the building is a single family home. From the 2016 edition of the California Residential Code [emphasis mine]: R313.3.5 Water supply. The water supply shall provide not less than the required design flow rate for sprinklers in accordance with Section R313.3.4.2 at a pressure not less than that used to comply with Section R313.3.6. Where a water supply serves both domestic and fire sprinkler systems, 5 gpm (19 L/min) shall be added to the sprinkler system demand at the point where the systems are connected, to determine the size of common piping and the size of the total water supply requirements where no provision is made to prevent flow into the domestic water system upon operation of a sprinkler. Now this isn't to suggest that some AHJ's won't apply this in a different manner. From a recent plan review rejection notice in California: Revise the hydraulic calculations for the companion unit to account for the hose demand for the 2 story dwelling unit and the companion unit, 5 + 5 = 10 gpm. w/ sprinklers it should be 44.4 gpm. There is only one underground lateral serving both dwellings. What this goes to show, I suppose, is that it depends on where the property is located as to whether or not that 5 gpm domestic allowance is required. Before I submitted a hydraulic calculation omitting that value I'd make absolutely certain that it were not required by state or local ordinance. sincerely, Ken Wagoner, SET Parsley Consulting 350 West 9th Avenue, Suite 206 Escondido, California 92025 Phone 760-745-6181 Visit the website On 08/17/2017 9:01 PM, Travis Mack wrote: Correct. That seems to be a fallacy that people locked on to long ago and never let go of. NFPA 13D is for one and two family dwellings. For a single family home it is not required. If you are doing a duplex (a two family dwelling) then you add the demand. Travis Mack, SET MFP Design, LLC "Follow" us on Facebook: https://www.facebook.com/pages/MFP-Design-LLC/92218417692 Send large files to MFP Design via: https://www.hightail.com/u/MFPDesign Sent from my iPhone On Aug 17, 2017, at 8:53 PM, Owen Evans <[email protected]> wrote: I have always added 5 gpm domestic flow at the riser when calculating a 13D system for a SFR. Last night I was having a hard time falling asleep so I thought I would break out the 2016 edition of 13D and start reading, surely I would fall asleep quickly. I got to 6.5 Common Supply Pipes, 6.5.2 which states; In common water supply connections servicing more that one dwelling unit, 5 gpm shall be added to the sprinkler system demand to determine the size of common piping and the size of the total water supply requirements...yada, yada, yada. So reading 6.5.2 I interpret that if it is a SFR (one unit) I am not required to add 5 gpm domestic into the calculations, correct? Owen Evans _______________________________________________ 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 _______________________________________________ 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
_______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
