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] (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)
