My first thought goes to dry system in the attic. Assuming pitch >2:12 you are calculating 2535 sq ft. This will end up being about 25-30 sprinklers with all of the attic spacing criteria. Dry system = K5.6 sprinklers, so 25 sprinklers * 15 gpm each *1.3 for over discharge gets you to a demand just south of 500 gpm.
I'd probably look at a tank more along the lines of 15k gallons. For pump, you have your demand about 500 gpm. Take your elevation pressure + end head pressure + some conservative figure for friction losses and that gives your pump rating. Again, this is just a rough estimate with extremely limited information. You may have a way where the specially listed attic sprinklers could significantly reduce that discharge. Globe has done a really good job with an attic sprinkler system to keep the water demands quite low. <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 Matt Grise Sent: Wednesday, May 22, 2019 12:04 PM To: [email protected] Subject: RE: Pump & Tank Fed From a Well If you are only providing enough tank for 150ish gpm, then a 250gpm pump would probably do the trick. As far as the slope goes..just be sure you explain what you are suggesting (and be sure they understand). Matt From: Sprinklerforum <[email protected] <mailto:[email protected]> > On Behalf Of Brian Harris Sent: Wednesday, May 22, 2019 1:56 PM To: [email protected] <mailto:[email protected]> Subject: Pump & Tank Fed From a Well I've been asked to provide "hypothetical" sizing for a pump & storage tank based on the assumption said tank will be filled from a well. It's a small light hazard building, think wedding chapel. Off the top of my head I come up with a 5000-gallon tank just based off of a light hazard remote area flowing (8) heads for (30) minutes, no hose. Any ideas on "guestimating" a pump size on the little to no information available or is this really going down a slippery slope? Brian Harris, CET BVS Systems Inc. Design Manager bvssystemsinc.com <http://bvssystemsinc.com/> Phone: 704.896.9989 Fax: 704.896.1935
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