Everything you install or modify has to “work”. Anything that you know doesn’t is bad ethics and a huge liability issue. Give the owner the options for fully adequate systems and let him make the decision. Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT 860-535-2080 (ofc) 860-553-3553 (fax) 860-608-4559 (cell)
> > On Oct 6, 2017 at 12:41 PM, <SET Reed A. Roisum > (mailto:[email protected])> wrote: > > > > > > I have an existing pipe schedule system in a partially sprinklered > building…installed in 1969. I am doing a life safety analysis that > includes budget estimating to provide new fire alarm and sprinklers. The > existing pipe schedule portion of the system is considerably higher in > elevation and remote. It doesn’t work hydraulically with the city supply. > Even when I replace the system with larger pipe I can’t get the calc to > work. > > > > > > > > In order to install a new system or keep the existing system in place and > have it hydraulically “work” we will need to install a fire pump. My > problem is, the owner may decide to just upgrade the fire alarm system and > not sprinkler the building if we need a fire pump as the sprinkler retrofit > is voluntary. > > > > > > > > My question for the Forum is, can an existing pipe schedule system be left > in place even if we retrofit the rest of the building and hydraulically prove > the rest of the building? > > > > > > > > NFPA 13, 2013 edition… > > > > 23.5 Pipe Schedules Pipe schedules shall not be used, except in > existing systems and in new systems or extensions to existing systems > described in Chapter 11. Water supplies shall conform to 11.2.2. > > > > > > > > If I can meet the water supply requirements of Table 11.2.2.1 for Ordinary > Hazard, which is a minimum pressure of 20 psi flowing 850 gpm then is the > pipe schedule permitted? > > > > > > > > It appears as though I am out of luck because of 11.2.2.6.1 Residual > Pressure… The residual pressure requirement of Table 11.2.2.1 shall be met at > the elevation of the highest sprinkler. > > > > > > > > The main reason I can’t get the calc to work is because of elevation. > > > > > > > > I would assume the AHJ would be willing to work with us if the choices are… > 1. No upgrade to the sprinkler system, or 2. A fully sprinklered building > with 2000 sq ft that is pipe schedule and doesn’t work hydraulically. > > > > > > > > Any insight or ideas will be appreciated. > > > > > > > > Reed > > > > > > > > > > > > > > Reed A. Roisum, SET| Karges-Faulconbridge, Inc.|Senior Fire Protection > Designer | Fargo, ND | direct:701.552.9903 |mobile: 701.388.1352 > | KFIengineers.com (http://www.kfiengineers.com) > > > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please visit http://www.symanteccloud.com > ______________________________________________________________________ > _______________________________________________ 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
