Ed, You answered your own question in your question... [sounds kinda weird huh?]
NFPA #13R 2007: 5.3.3 Where antifreeze systems, dry pipe systems, and preaction systems are installed, they shall be installed in accordance with NFPA 13, Standard for the Installation of Sprinkler Systems. NFPA #13R 2007: 6.8.4, "Piping shall be sized using hydraulic calculation procedures in accordance with NFPA 13." -B- On 4/17/08, Joe Hankins <[EMAIL PROTECTED]> wrote: > > It doesn't matter in a 13R system. It came into the standard when > antifreeze ESFR systems were being considered, where the delay in full water > delivery for a minute would be a big problem. That's the problem with the > written word, it says what it says, not what the committee meant! > > Joe > > > > Fletcher, Ron wrote: > > > Does it really matter? The antifreeze is only in the pipe, it's not in > > the water supply. After the initial fill is gone it's just plain water. > > It doesn't seem like a friction loss different from plain water for the > > first minute or less is going to make much of difference. If your local > > sprinkler scientist (AHJ) wants the antifreeze mixture calc how would > > you account for the gradual dilution of the mixer as clean water enters > > the system? The viscosity wouldn't be a constant. Sounds like calc with > > a computer, measure with a caliper, mark with chalk and cut off with an > > axe. > > > > Ron Fletcher > > Aero Automatic > > Phoenix, AZ > > -----Original Message----- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] On Behalf Of Roland > > Huggins > > Sent: Thursday, April 17, 2008 3:28 PM > > To: [email protected] > > Subject: Re: 13R antifreeze calc > > > > the ability of the chosen equation to reasonable predict friction lose > > is not a function of what standard requires the calculation. The sub-zero > > antifreeze systems with a high viscosity started this ball > > rolling and nothing says at more normal temperatures (like 20 F) the > > viscosity issue doesn't matter (so the academic hat is overshadowing the > > practicality hat in this debate). > > > > Roland > > > > On Apr 17, 2008, at 2:59 PM, Ed Kramer wrote: > > > > > > > > > Forum members - your opinions on the following situation, please: > > > > > > > > > > > > Design standard is 13R 2007 edition. System type will be antifreeze > > > with a volume exceeding 40 gallon. > > > > > > > > > > > > Per 13R section 6.8.4, "Piping shall be sized using hydraulic > > > calculation > > > procedures in accordance with NFPA 13". NFPA 13 says to use the > > > Darcy-Weisbach method (section 22.4.4.5.1). > > > > > > > > > > > > Do you think it's the intent of 13R to require the calcs be done using > > > > > > > > > > > > > > > Darcy-Weisbach? > > > > > > > > > > > > Ed Kramer > > > > > > Littleton, CO > > > > > > _______________________________________________ > > > Sprinklerforum mailing list > > > [email protected] > > > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > > > > > To Unsubscribe, send an email to:Sprinklerforum- > > > [EMAIL PROTECTED] (Put the word unsubscribe in the subject > > > field) > > > > > > > > > > > > > _______________________________________________ > > Sprinklerforum mailing list > > [email protected] > > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > > > To Unsubscribe, send an email > > to:[EMAIL PROTECTED]<[EMAIL PROTECTED]> > > (Put the word unsubscribe in the subject field) > > > > _______________________________________________ > > Sprinklerforum mailing list > > [email protected] > > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > > > To Unsubscribe, send an email > > to:[EMAIL PROTECTED]<[EMAIL PROTECTED]> > > (Put the word unsubscribe in the subject field) > > > > > > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > To Unsubscribe, send an email to:[EMAIL PROTECTED]<[EMAIL PROTECTED]> > (Put the word unsubscribe in the subject field) > _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
