Victaulic DPV have very low supervisory air pressures. They act more like a Pre-action valve the clapper is held in place by an actuator. Air pressure is critical to the operation. You must have an operating Air Maintenance Device. The high low differential is only somewhere around 5 to 7 psi this is from memory and I'm an old fart. Using the reading on the gauges on the valve is something that needs to checked. Bring a calibrated gauge to check them. I would bet you will find that your replacing air almost as fast as your discharging it out of the ITV.
Set up is critical to proper operation get that right and I think you will be fine. Sent from my iPhone On Oct 25, 2012, at 11:15 AM, "Gregg Key" <gr...@keyfps.com> wrote: > Very good feedback. This system was installed in 2006 and is a Victaulic > dpv. We have none of the original acceptance test paperwork but would make > an assumption that it would have passed then. It appears to be a small > system. Mike ,you are right about the by-pass line as it appears that there > is not one installed. Air Compressor is in a hidden crawl space below the > floor. My thought was that something has restricted the air release in the > inspectors test but have not taken it apart. Thanks for everyones help > > C.Gregg Key, SET > Key Fire Protection Services,Inc > Project Manager > (O) 706-790-3473 > (C) 706-220-8821 > > -----Original Message----- > From: sprinklerforum-boun...@firesprinkler.org > [mailto:sprinklerforum-boun...@firesprinkler.org] On Behalf Of Mike Cabral > Sent: Thursday, October 25, 2012 10:40 AM > To: sprinklerforum@firesprinkler.org > Cc: sprinklerforum@firesprinkler.org > Subject: Re: trip time per nfpa 25 > > I would check to make sure that the air supply to the DPV is working as it > should. The time to trip should never be that long. Is the by-pass open? > Sounds like the make-up air is supplying to much air. The make up air needs > to be restricted. The supply line to the Inspectors Test can be larger than > 1" it can't be less than 1" however the standard does no say it can't be > larger than 1". > > Sent from my iPhone > > On Oct 24, 2012, at 1:13 PM, Todd Letterman <tletter...@haifire.com> wrote: > >> It is also not going to trip or be severely delayed if there is a water > column occurrence holding the clapper shut. >> >> -----Original Message----- >> From: sprinklerforum-boun...@firesprinkler.org >> [mailto:sprinklerforum-boun...@firesprinkler.org] On Behalf Of Ron >> Greenman >> Sent: Wednesday, October 24, 2012 11:06 AM >> To: sprinklerforum@firesprinkler.org >> Subject: Re: trip time per nfpa 25 >> >> I don't believe their is any reference to "how long is too long" >> except in >> 13 (pre 2010) where a system of between 500 & 750 gallons is required to > have a QOD if the water delivery time to the inspectors test exceeds 60 > seconds. I think there is a presumption that a system of less than 500 > gallons will trip in a "timely" manner, that over 750 gallons won't without > a QOD, and that in between one is questionable. From there the one minute > trip time came to be the conventional standard, although the book only > referred to water delivery time after the trip occurred. In the 2010 edition > times are specified. See section 7.2.3.6 Dry Pipe System Water Delivery. > Although entitled as "water delivery time" it tells you that the delivery > time countdown starts at normal air pressure which suggests pre-trip, tto > the actual trip, and finishing with water at the test port. >> >> On Wed, Oct 24, 2012 at 10:27 AM, Gregg Key <gr...@keyfps.com> wrote: >> >>> Our inspector ask an interesting question today. How long is too long >>> of a time for a dry valve to trip before it is considered a >>> deficiency? 25 does not specify but 15 min seams too long. Don't have >>> the previous report to compare it to. >>> >>> C.Gregg Key, SET >>> Key Fire Protection Services,Inc >>> Project Manager >>> (O) 706-790-3473 >>> (C) 706-220-8821 >>> >>> >>> _______________________________________________ >>> Sprinklerforum mailing list >>> Sprinklerforum@firesprinkler.org >>> http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum >> >> >> >> -- >> 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: >> ASEE, SFPE, ASCET, NFPA, AFSA, NFSA, AFAA, NIBS, WSAFM, WFC, WFSC >> >> 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/atta >> chments/20121024/57fe47b6/attachment.html> >> _______________________________________________ >> Sprinklerforum mailing list >> Sprinklerforum@firesprinkler.org >> http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum >> _______________________________________________ >> Sprinklerforum mailing list >> Sprinklerforum@firesprinkler.org >> http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@firesprinkler.org > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@firesprinkler.org > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
