You don’t specify what type of pipe and how long the run is. Does the type of 2” meet the requirements of NFPA 13?
Section 5.1.3 (2019) permits underground smaller than 6” if it can support hydraulics. You would need to do the full calculation with the actual 2” underground main included, not an assumption. 324 gpm going through 2” copper pipe has a friction loss of .58 psi/ft. Your 10 psi assumption would include only 17 equivalent feet of 2” copper. The velocity would be over 30 ft per second. You should also check with the water purveyor to see if they have a minimum size for sprinkler system connections. Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT 860-535-2080 (tel:860-535-2080) (ofc) 860-554-7054 (tel:860-554-7054) (fax) 860-608-4559 (tel:860-608-4559) (cell) > > On Jan 6, 2023 at 8:47 AM, <Brian Harris (mailto:[email protected])> > wrote: > > > > > > Been asked to verify a 2” underground supply will work for a NFPA-13 Dry > system for a small Patio/Bar. Water supply is good, S=114 / R=106 / F=1556. > Preliminary numbers I’ve ran show a system demand of 324gpm @ 46psi. That’s > assuming a 10psi loss for underground pipe (BFP is 10 as well), the loss for > 2” underground is the part I’m not real comfortable about. Any thoughts? > > > > > > > > Brian Harris, CET > > > > BVS Systems Inc. > > > > Design Manager > > > > bvssystemsinc.com (http://bvssystemsinc.com/) > > > > Phone: 704.896.9989 > > > > Fax: 704.896.1935 > > > > > > > > > > > _________________________________________________________ SprinklerForum > mailing list: > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > To unsubscribe send an email to [email protected] >
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