As much as it pains me, I have to agree with Ron. If you've got a closed head deluge system, you don't have a deluge system. You've got a non-interlocked deluge system. To allow air supervision, you'll need to add a check atop the preaction valve. And whatever else Sal says, he'd be the one to know!
George L. Church, Jr., CET Rowe Sprinkler Systems, Inc. PO Box 407, Middleburg, PA 17842 877-324-ROWE 570-837-6335 fax [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Ron Greenman Sent: Friday, December 02, 2011 11:03 AM To: [email protected] Subject: Re: Reliable Model B Deluge Valve - Air Supervision Mike, Definition: Deluge systems are systems in which all sprinklers connected to the water piping system are open, in that the heat sensing operating element is removed, or specifically designed as such. On Thu, Dec 1, 2011 at 12:29 PM, Sal Izzo (TECH- 103) < [email protected]> wrote: > Mike: > > The old Model B deluge valve cannot hold air pressure without a riser > check valve installed above it. The alarm line trim is directly > connected to the inside of the deluge valve without the use of any > intermediate type chamber in the seat. Therefore, air pressure > introduced into the valve will leak directly out the automatic ball drip > valve on the alarm line. > This design permits visual inspection at the ball drip for any leaks > at the seat, as well as enabling draining of any water due to > condensation or drainback. By installing a valve on this line, you > lose visually a way to detect a leak at the seat, as well as prevent a > waterflow alarm occurring from the eventual buildup of pressure from such > leak. > . > > Salvatore J. Izzo, P.E. SFPE, Manager - Technical Services The > Reliable Automatic Sprinkler Company, Inc. > 103 Fairview Park Dr. > Elmsford, NY 10523 > Tel: (864) 843-5252 Fax: (864) 843-3073 > E-mail: [email protected] > ________________________________________ > From: [email protected] [ > [email protected]] On Behalf Of Morey, Mike [ > [email protected]] > Sent: Thursday, December 01, 2011 1:40 PM > To: [email protected] > Subject: Reliable Model B Deluge Valve - Air Supervision > > We have what amounts to a closed head electronically actuated deluge > system, or maybe a non interlock electronically actuated preaction system? > I'm not even sure how to make the distinction. It utilizes a > reliable model B 6" deluge valve that appears to have more or less > standard trim and an alarm pressure switch. We're attempting to > convert the system to low pressure nitrogen supervision only to monitor the > integrity of the pipe. > The issue we're running into is that when we attempt to pressurize > the system the ball drip/velocity check in the alarm pressure switch > trim leaks air at a high rate. The proposal was to add a check valve > above the deluge valve to allow an intermediate chamber without air > pressure to be monitored for alarms, but this adds another drain, > pressure gauge etc that will all have to be piped into 2 large and > unwieldy systems that are already installed. Is there anything that > would prohibit us from just replacing the ball drip valve with a > standard d rain valve, or adding a shutoff in front of the ball drip? > These systems are pretty meticulously maintained so draining off the > alarm line wouldn't be a major issue. Code wise I can't see anything > that mandates the presence of the valve, it seems to be more to allow > condensate to drain and allow the alarm line to be drained quickly after a > trip. > > Mike Morey, SET, CFPS > Sprinkler Designer > BMW Constructors, Inc. > O: 317.651.0596 | C: 317.586.8111 > www.bmwc.com > -------------- next part -------------- An HTML attachment was > scrubbed... > URL: < > http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attac > hments/20111201/cac144ef/attachment.html > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > -- 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: ASEE, SFPE, ASCET, NFPA, AFSA, NFSA, AFAA, NIBS, WSAFM, WFC They are happy men whose natures sort with their vocations. -Francis Bacon, essayist, philosopher, and statesman (1561-1626) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20111202/76f1694d/attachment.html> _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
