1987 13, section 5-2.3.1 "Gridded dry-pipe systems shall not be installed." 1985 13, section 5-2.3.1 "Not more than 500-gal system capacity for gridded systems or not more than 750-gal system capacity for non-gridded systems..."
----- Original Message ----- From: "Jimmy Waite" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Monday, March 26, 2007 3:50 PM Subject: RE: Mezzanine Calcs. > Yep, a dry grid. Apparently it was allowed before the '88 edition of 13. > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Gary Stites > Sent: Monday, March 26, 2007 2:51 PM > To: [email protected] > Subject: RE: Mezzanine Calcs. > > > Dry Grid? > > Gary Stites > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Todd > Williams - work > Sent: Monday, March 26, 2007 1:45 PM > To: [email protected] > Subject: Re: Mezzanine Calcs. > > Jimmy, > > If it were me, I'd do the calc. Since you are tying into the gird, you > are not maintaining a pipe schedule back to the riser so you can't > really call it pipe schedule. Plus, you might be amazed at the amount of > friction loss that can be generated when you calc through a grid to a > single point to feed a tree system. > > Todd > > > At 03:53 PM 3/26/2007, you wrote: > > >Dear Forum, > > > >We are currently working on a project where we are tying onto a dry, > >gridded sprinkler system, installed in 1985. There are two existing > >dry systems and they each cover an area of about 13,100 square feet. > >The lower floor is a tree system that was sized by "Table 3-7.1" of > >NFPA 13, 1984 Ed. The main floor is a grid that was designed at a > >.275/ 3000 square feet with 500 gpm hose allowance. The addition that > >we are sprinklering is only 2,000 square feet. On the main floor of > >the addition there is a mezzanine of about 1,000 square feet. Is a > >calculation even needed for such a small addition, or can we use the > >existing pipe sizing as our guide? If a calculation is required, would > > >we calculate the sprinklers along the roof deck by themselves, or do we > > >need to include the sprinklers under that mezzanine in our calculations > as well. > > > >Thanks for the help > > > >Jimmy Waite > >Burtell Fire Protection, Inc. > >[EMAIL PROTECTED] > >406-652-7697 > > > > > > > > > >_______________________________________________ > >Sprinklerforum mailing list > >[email protected] > >http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > Todd G. Williams, PE > Fire Protection Design/Consulting > Stonington, Connecticut > 860-535-2080 > www.fpdc.com > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
