C value for new steel 140, we use 120 Wet, 100 Dry to allow for age. There are systems out there approaching 30 years that were calculated (+/-). I wonder the condition of these. Was the 120/100 used correct? I would think not based on the inside of piping I have seen over the years. The flushing required by 25 is a good starting point to control this. At what point though do we consider the C worse that the allotted for aging?
R/ Matt Matthew J. Willis, CET Automatic Fire Sprinklers Norred Fire Systems L.L.C. 318-387-1134 Voice 318-816-1087 Mobile 318-387-1163 Facsimile [email protected] > >-----Original Message----- > >From: [email protected] [mailto:sprinklerforum- > >[email protected]] On Behalf Of Ron Greenman > >Sent: Thursday, September 16, 2010 11:30 AM > >To: [email protected] > >Subject: Re: Pipe Schedule Systems > > > >And what is the C factor of any given system but a guess? I just saw a > >picture of a relatively new system (five years) that had complete > >clogging of some pipes. C = 0? I'm surprised your AHJ didn't make you > >calculate for each pipe one diameter smaller than the installed size > >so as to adjust for age shrinkage. > > > >On Thu, Sep 16, 2010 at 9:23 AM, Thom <[email protected]> wrote: > >> > >> Then there's always the question of what C factor to use in your calc's > >of > >> an old PS system? Have you seen the inside of these pipes? Do you use > >120 or > >> 100 or maybe even 80? There is really no guide on what's appropriate. I > >had > >> one AHJ that just wanted the calc to fail, and required that we use a C > >of > >> 80, when that calc still worked, he said oh I meant 60. > >> There was a fight but we ended up doing an internal inspection of the > >pipe > >> and he accepted the calc that used 80. (Still just a guess on his > >part.) > >> > >> Thom > >> > >> _______________________________________________ > >> Sprinklerforum mailing list > >> [email protected] > >> http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > >> > >> For Technical Assistance, send an email to: [email protected] > >> > >> To Unsubscribe, send an email to:Sprinklerforum- > >[email protected] > >> (Put the word unsubscribe in the subject field) > >> > > > > > > > >-- > >Ron Greenman > >Instructor > >Fire Protection Engineering Technology > >Bates Technical College > >1101 So. Yakima Ave. > >Tacoma, WA 98405 > > > >[email protected] > > > >http://www.bates.ctc.edu/fireprotection/ > > > >253.680.7346 > >253.576.9700 (cell) > > > >Member: > >AFSA, SFPE, ASCET, NFPA, NFSA, AFAA, ASEE, NIBS, WSAFM, WFC > > > >They are happy men whose natures sort with their vocations. -Francis > >Bacon, essayist, philosopher, and statesman (1561-1626) > >_______________________________________________ > >Sprinklerforum mailing list > >[email protected] > >http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > > >For Technical Assistance, send an email to: [email protected] > > > >To Unsubscribe, send an email to:[email protected] > >(Put the word unsubscribe in the subject field) > >No virus found in this incoming message. > >Checked by AVG - www.avg.com > >Version: 9.0.851 / Virus Database: 271.1.1/3137 - Release Date: 09/16/10 > >01:34:00 _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
