Of course the operation of these things does not keep the solution from being diluted since the purpose is to keep the solution from back siphoning and that operation will dump solution and allow fresh water in. It's a delicate balance that takes lots of testing to maintain.
On Tue, Jan 4, 2011 at 2:50 PM, Thom <tmcma...@firetechinc.com> wrote: > AS a continuation of what Mark said, what are the relative elevations of the > two points of connection? Sufficient elevation difference could make any > loop less effective. > > -----Original Message----- > From: sprinklerforum-boun...@firesprinkler.org > [mailto:sprinklerforum-boun...@firesprinkler.org] On Behalf Of Mark Sornsin > Sent: Tuesday, January 04, 2011 3:19 PM > To: sprinklerforum@firesprinkler.org > Subject: RE: antifreeze system with 2 connection points > > I would think you may still need the loop on the secondary connection if > conditions are right... what would keep the antifreeze from 'drifting' past > the secondary check valve when the pressures are equal on both sides of that > check (and thereby allowing dilution of the mixture)? > > Mark A. Sornsin, PE | Fire Protection Engineer > Ulteig Engineers, Inc. |Fargo, ND > Direct: 701. 280.8591 | www.ulteig.com > > > -----Original Message----- > From: sprinklerforum-boun...@firesprinkler.org > [mailto:sprinklerforum-boun...@firesprinkler.org] On Behalf Of Art Tiroly > Sent: Tuesday, January 04, 2011 3:24 PM > To: sprinklerforum@firesprinkler.org > Subject: RE: antifreeze system with 2 connection points > > If I understand this correctly, are you creating a loop feed for the > hydraulics? You need check valves and control valves at both ends. > > I don't think you need a standard AF loop beyond the RPZBFP. You do need to > control pressure but in a different way. > > > Arthur Tiroly > ATCO Fire Protection Design > > > -----Original Message----- > From: sprinklerforum-boun...@firesprinkler.org > [mailto:sprinklerforum-boun...@firesprinkler.org] On Behalf Of Ed Kramer > Sent: Tuesday, January 04, 2011 3:12 PM > To: sprinklerforum@firesprinkler.org > Subject: antifreeze system with 2 connection points > > I vaguely recall this being discussed previously, but can't find it. > > > > Is there anything in NFPA 13 that prohibits an antifreeze system from having > multiple connection points to a wet sprinkler system? This configuration > wouldn't be used a lot, but in the right circumstances could significantly > decrease antifreeze volume and improve hydraulics. > > > > I don't think so, so I'm going to run with this. Let's assume the wet > sprinkler system has an RPZ backflow preventer at the system riser and the > 'primary' antifreeze connection utilizes the standard antifreeze loop > (control valve, 5' drop, test valves, check valve w/ 1/32 hole, drain > valve). Can the 'secondary' connection simply be a control valve and check > valve (without hole), or does it need to be the full-blown standard > antifreeze loop? > > > > The standard antifreeze loop at the 'primary' connection would serve the > purpose of providing test and drain valves and providing a means to prevent > over-pressurization. The control valve and check valve at the 'secondary' > connection would be used to isolate the system for maintenance and to > prevent antifreeze solution from flowing back into the wet system. > > > > Signs should be posted at both connections indicating the existence and > location of the other connection. > > > > Comments or thoughts? > > > > Ed Kramer > > Littleton, CO > > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@firesprinkler.org > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: supp...@firesprinkler.org > > To Unsubscribe, send an email to:sprinklerforum-requ...@firesprinkler.org > (Put the word unsubscribe in the subject field) > > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@firesprinkler.org > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: supp...@firesprinkler.org > > To Unsubscribe, send an email to:sprinklerforum-requ...@firesprinkler.org > (Put the word unsubscribe in the subject field) > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@firesprinkler.org > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: supp...@firesprinkler.org > > To Unsubscribe, send an email to:sprinklerforum-requ...@firesprinkler.org > (Put the word unsubscribe in the subject field) > > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@firesprinkler.org > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: supp...@firesprinkler.org > > To Unsubscribe, send an email to:sprinklerforum-requ...@firesprinkler.org > (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 rgreen...@bates.ctc.edu 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 Sprinklerforum@firesprinkler.org http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: supp...@firesprinkler.org To Unsubscribe, send an email to:sprinklerforum-requ...@firesprinkler.org (Put the word unsubscribe in the subject field)
