While there is high pressure hose, standard attack lines are annually tested to 250 psi.
At this pressure it is not unusual to have a few lengths fail test. By fail I mean burst, or more common slip at fitting. Anecdotal, my observations only. Of course weakest link theory applies. Large diameter, supply line may be rated at lower pressure. Bruce Verhei > On Aug 2, 2016, at 16:16, Steve Leyton <[email protected]> wrote: > > There is no height limit in latest editions of NFPA 14. Standpipes that > directly supply hose connections are limited to 350 PSI (stay tuned for 2019 > cycle on that one) but there is no height or pressure limit on express mains > that serve upper zones. Our firm designed a 545’ single zone system for a > tower here in San Diego. > > The foregoing is my opinion only and is not intended to represent the NFPA 14 > Technical Committee, nor serve as an interpretation of the standard. > > Steve L. > > From: Sprinklerforum [mailto:[email protected]] > On Behalf Of tcfire > Sent: Tuesday, August 02, 2016 2:50 PM > To: [email protected] > Subject: RE: HIGH RISE BUILDING > > Seems I recall you can go up to 400 ft with a single zone if you use > PRV's...may be an older ver6of 14 though. > > > > > Sent from my Sprint Samsung Galaxy S7. > > -------- Original message -------- > From: Dewayne Martinez <[email protected]> > Date: 8/2/16 4:33 PM (GMT-05:00) > To: [email protected] > Subject: HIGH RISE BUILDING > > Is there a limit to the height or number of stories a “zone” for a high rise > building can supply? I have a spec written to say each zone can either be a > maxim height of 275ft or 20 stories. > Thanks, > Dewayne > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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