One minor problem -where you going to find a new exhauster? The reference to exhausters in NFPA 13 has been removed for the 2010 edition since they are no longer manufactured.
Even with one, any bets that a 2-1/2 minute water delivery after valve trip will still not make the combined 60 sec maximum? Roland On May 2, 2009, at 8:08 PM, Ed Vining wrote: > You point out that the valve now trips in 50 seconds, where before > it was > 80. This indicates the accelerator is working, but not fast enough. > Possibly because of the accelerator itself. A restriction in the IT > discharge line could cause it too. If the pipe to the ITV is very > long, > trip time could be reduced by upping the size. Even if the > accelerator > tripped much faster, it seems the delivery time would be too long > > An exhauster would certainly help, particularly if it is way out on > the > system. One has to be careful, though, when both an exhauster and > accelerator are used. The exhauster must trip first. > > A manufacturer could tell you if the 19 psi is outside the working > range of > his exhauster. Spec sheets usually list only the maximum rated > pressure. > The speed of operation of an exhauster can be adjusted, but it must > be done > carefully. If it is too sensitive, the system could trip on normal > variations in pressure. > > Ed > > -- > Ed Vining > 4819 John Muir Rd > Martinez CA 94553 > 925-228-8792 > _______________________________________________ > Sprinklerforum mailing list > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > For Technical Assistance, send an email to: techsupp...@firesprinkler.org > > To Unsubscribe, send an email to:sprinklerforum-requ...@firesprinkler.org > (Put the word unsubscribe in the subject field) > _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: techsupp...@firesprinkler.org To Unsubscribe, send an email to:sprinklerforum-requ...@firesprinkler.org (Put the word unsubscribe in the subject field)
