Ron, I am basing my opinion off of fire protection hydraulics and experience. After combing through the latest NFPA 13 edition (2019), it mentions nothing regarding flex hose assemblies in pipe schedule systems---only that two sprinklers can be installed on 1" pipe. This is another NFPA 13 gray area. Light Hazard pipe schedule is probably based off of 15 feet of 1" schedule 40 pipe per one head. A Racoflex 40" flex hose assembly per UL listing is equivalent to 21 feet of 1" schedule #40 pipe. 36" feet of 1" schedule 40 pipe supplying one head should probably be calculated. There can be a significant pressure loss. I've had AHJs call this out before.
Steve, Good point. But, if an AHJ catches on to this it can really bring down a small job. TYSON SUTHERLAND, CET NICET Level III Design Technician Ohio ASSD #8495 2900 Newpark Drive Barberton, OH 44203 888-857-2817 x317 330-600-0697 Cell [email protected] -----Original Message----- From: Sprinklerforum <[email protected]> On Behalf Of Ron Greenman via Sprinklerforum Sent: Monday, August 2, 2021 4:59 PM To: [email protected] Cc: Ron Greenman <[email protected]> Subject: Re: Flexible hose head connectors on a pipe schedule system BE ADVISED - This email originated outside EMCOR. Tyson, While I tend to agree with you and can think of many pipe scheduling rules going back half a century or more that would suggest that flex heads are ad were outside of the scope of a pipe scheduled system I'm curious as to what criteria you're basing your opinion on. At face value, it would seem that they would be fine as long as no more than two were attached to one-inch pipe in light and ordinary hazard situations, or only one per length of one-inch pipe in extra hazard (extra hazard pope schedule systems having been allowable in times past). On Mon, Aug 2, 2021 at 11:32 AM Tyson Sutherland via Sprinklerforum < [email protected]> wrote: > Sean, > > Because the friction loss of most flex hose assemblies are equivalent > to > 20-30 feet of 1" schedule 40 pipe, in my opinion hydraulic > calculations would be required. > > > TYSON SUTHERLAND, CET > NICET Level III Design Technician > Ohio ASSD #8495 > > 2900 Newpark Drive > Barberton, OH 44203 > > 888-857-2817 x317 > 330-600-0697 Cell > [email protected] > > -----Original Message----- > From: Sprinklerforum <[email protected]> > On Behalf Of Sean Lockyer via Sprinklerforum > Sent: Monday, August 2, 2021 2:08 PM > To: [email protected] > Cc: Sean Lockyer <[email protected]> > Subject: Flexible hose head connectors on a pipe schedule system > > > BE ADVISED - This email originated outside EMCOR. > > > Can flexible hose head connectors (I.E. - "Flexheads") be used on a > pipe scheduled system ? Since calculations were not performed due to > it being a scheduled system, the friction loss would be superfluous, > correct ? Any help would be greatly appreciated. > > Thanks > Sean Lockyer > AIT Life Safety > > > > > > > > > > > > > > > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > https://urldefense.com/v3/__http://lists.firesprinkler.org/listinfo.cg > i/sprinklerforum-firesprinkler.org__;!!FaxH778!IbjdgPzNvfRo_9I3w-4Lvk3 > gveGdIerQzFD2VZCAmlHnz67IR63DiQoMZo-O_grDDQEnLDg$ > > This message is for the named person's use only. It may contain > confidential, proprietary or legally privileged information. No > confidentiality or privilege is waived or lost by any mistransmission. > If you receive this message in error, please immediately delete it > and all copies of it from your system, destroy any hard copies of it > and notify the sender. You must not, directly or indirectly, use, > disclose, distribute, print, or copy any part of this message if you > are not the intended recipient. > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > https://urldefense.com/v3/__http://lists.firesprinkler.org/listinfo.cg > i/sprinklerforum-firesprinkler.org__;!!FaxH778!Ky0pJwmNH6Jnuit_B64AfaV > THVX57Jj8oyBnW9iIqYnWs4MJ_uF_LhZU-xHxqY7TU589Hzg$ > _______________________________________________ Sprinklerforum mailing list [email protected] https://urldefense.com/v3/__http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org__;!!FaxH778!Ky0pJwmNH6Jnuit_B64AfaVTHVX57Jj8oyBnW9iIqYnWs4MJ_uF_LhZU-xHxqY7TU589Hzg$ _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
