Duration is critical. You can not guarantee that the fire will be controlled in only 45 minutes regardless of how soon the local fire brigade responds. Plus, are you relying on them to bring additional water if needed? Their supply within the trucks is very limited so as they run out they may have to leave the site to refill but in any case that could result in a delay in their attack and an out of control fire scenario.
I would never for any reason see the reduction of the duration as specified in NFPA having any value. Quite the contrary, it would result in a non-compliant system and put you responsible for any damage due to the ineffectiveness of the inadequate system. In the building codes we have there is wording stating that even if a particular fire system is not required by the code, if you install it, you must still install it according to the applicable codes. So even if no one was going to review or approve it, you must still design and install it according to the codes that govern it. Craig L. Prahl, CET Fire Protection Group Mechanical Department CH2MHILL Lockwood Greene 1500 International Drive PO Box 491, Spartanburg, SC 29304-0491 Direct - 864.599.4102 Fax - 864.599.8439 [EMAIL PROTECTED] http://www.lg.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Reza Esmaeili Sent: Tuesday, September 25, 2007 10:52 AM To: [email protected] Subject: How much Water Supply Duration is Important? Hi, I know it is very important to take care of water supply duration, but how much important? Imagine fire brigade is very close to the factory and will come to extinguish fire in less than 5 minutes. If for an extra hazard occupancy which I need at least 90 minutes of water supply for my wet pipe sprinkler system demand, I reduce it to 45 minutes, then what will happen? If I don't care about my required pressure and flow, then the entire system will fail, but if I reduce water supply duration, then system will work properly but only for 45 minutes, so if the fire brigade can come in 5 minutes, there wouldn't be a serious problem, Imagine that no one is going to approve the system (No insurance, ...). I just want to analyze fire behaviour in this case, it is not a real project. Thanks, Reza --------------------------------- Be a better Globetrotter. Get better travel answers from someone who knows. Yahoo! Answers - Check it out. _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
