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 <[email protected]> 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: [email protected] > [mailto:[email protected]] On Behalf Of Ron Greenman > Sent: Wednesday, October 24, 2012 11:06 AM > To: [email protected] > 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 <[email protected]> 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 >> [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, 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/attachments/20121024/57fe47b6/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 _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
