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/attachments/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
