No installation standard issues that I'm aware of. Since you have already hard piped in the return bend, you should be good to go, otherwise the flexible drop would have to come out of the top of the branch line.
The above is my opinion and has not been processed as a formal interpretation in accordance with the NFPA Regulations Governing Committee Projects. This is provided with the understanding that the AFSA assumes no liability for this opinion or actions taken on it and they are not to be considered the official position of the NFPA or its technical committees. AFSA cannot provide design or consulting engineering services, and this opinion should therefore not be considered, nor relied upon, as such. Kevin Hall, M. Eng, P.E., CWBSP, MSFPE Coordinator, Engineering and Technical Services American Fire Sprinkler Association [email protected] 214-349-5971 On Wed, Mar 24, 2021 at 12:49 PM Henry Fontana via Sprinklerforum < [email protected]> wrote: > Hello Matt > > I was working in a data center where the customer was very hydrophobic so > we decided to use the "dry" flex pendants. They worked very well and in > case of an accidental dump of the system their would be no trapped water. > > Henry Fontana > Operations Manager (NYC) > Johnson Controls Fire Protection > 100 Lighting Way Secaucus, NJ 07094 > Cell: 201-210-9873 > [email protected] > > > -----Original Message----- > From: Sprinklerforum <[email protected]> On > Behalf Of Matt Grise via Sprinklerforum > Sent: Wednesday, March 24, 2021 12:43 PM > To: [email protected] > Cc: Matt Grise <[email protected]> > Subject: flex drops on return bend > > I am looking at a library that is protected by a pre-action system with > pendants on return bends. I was thinking about using flex drops in the drop > portion of the return bend for ease of testing and center of tile. The flex > drops are listed for use in dry systems - so I can't think of any code > reason not to do it. Has anyone used flex drops in pre-action or dry > systems before? Any issues? > > Matt > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.firesprinkler.org%2Flistinfo.cgi%2Fsprinklerforum-firesprinkler.org&data=04%7C01%7CHenry.Fontana%40jci.com%7C3a2306ea775945d6cf6308d8eee3de8e%7Ca1f1e2147ded45b681a19e8ae3459641%7C0%7C1%7C637522009742840055%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=eBCyi1qcau5Lm4fQWmqs5DI8u4nvSY7bvEUW4eMa0qk%3D&reserved=0 > _______________________________________________ > 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
