Since we're on the topic, I have to add to the mix. The last sentence from IBC§903.3.5.2 reads:
".... The secondary water supply shall have a duration of not less than 30 minutes as determined by the occupancy harzard classificaiton in accordance with NFPA 13." Since many of these high-rises have merchantile or a parking garage included, doesn't this mean that the required duration is now for Ordinary Hazard Occupancy - 60 minutes? Regards MK ***************************************************** Ken Miller Asst. Fire Protection Engineer Las Vegas Fire & Rescue 500 N Casino Center Blvd Las Vegas, Nevada 89101 Phone: 702-229-4709 Fax: 385-0718 email: [email protected] ***************************************************** -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Saturday, December 13, 2008 11:10 AM To: [email protected] Subject: Re: Hi Rise Secondary Source ... again Thom, I checked IBC after posting. It says the tank is to be sized for 30 minutes of the "hydraulically calculated sprinkler demand, including the hose stream allowance". There is no mention of standpipe demand. I might be wrong, but I have never seen "hose stream allowance" used in context of anything but sprinkler calculations. Is it? Please let me know. Could it be that the code writers know that a hose stream allowance is part of a sprinkler demand calculation and that it might be confusing if they did not flat out say standpipe demand if that is what they really meant? I think that is a fair assumption, of course sometimes it seems like the code committees conspire together over drinks and with rousing laughter to, "make'm scratch their heads for hours over this one." Allan Seidel St. Louis, MO _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
