I wish that existed many editions ago. One of our clients have 20+ group residences built in the 70's and 80's, more like large ranch houses, they house severely mentally retarded adults. Most have 3" or 4" DPV's and sch40 systems throughout the attics feeding uprights and dry pendents. Some of these systems we wait up to 2 minutes for a solid stream of water and they're not very large which is the strange part, maybe 2500 SF. We've done work on them, accelerators, repaired broken pipe, air compressors, etc., and even replaced some with perimeter soffitted cpvc wet systems. I just scratch my head (and get splinters) on some of these wondering about what might happen if they ever had to wait that long. I don't know if there was some sort of loophole allowing really small pipe in those days (early 13R?) but most were done by out of state contractors no longer around.
It's very humbling to spend time in one of these settings, even having a retarded brother. I had to go there on a Christmas Eve a few years ago for a head that started leaking and the system tripped, they have to wheelchair them out to vans with the heaters running, all freaked out, one at a time. 15 seconds is great. I don't mean to blab on but if it was any kind of use similar to this one, I'd find a way to provide a wet system if I could. Tom true but the text is weakly worded. The section that references the Table says "based on the hazard" not the type of sprinkler (as does the Table). I believe the intent was for residential sprinklers (for which a 15 sec requirement exists as part of the listing test standard) but writing what you mean can be a challenge. As pointed out by Ed, the 2010 clarifies it nicely. It was an interesting evolution. It started with the standard dry pipe rule: 60 sec for systems greater than 500 gal and said any size system protecting residential dwellings shall not exceed 60 sec. Then it was pushed down to 15 sec. Roland On Mar 31, 2009, at 9:29 AM, Thom McMahon wrote: > This requirement for 15 Sec. delivery in residential dry systems > already > exists in NFPA 13 2007, Table 7.2.3.6.1 > > Thom McMahon, SET _______________________________________________ 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)
