You have 820,000 sq. ft. and only one run-in? Say it isn't so. You have all your sprinklers and standpipes off a single system run-in. Bad plan. If there is a single impairment on that run-in your entire building is without any fire protection. That's a major 6:00 news event waiting to happen.
So how many risers are going to be on the manifold at that run-in, assuming light or ordinary hazard you'd have 16 risers at minimum off one run-in. No, no, no, bad plan. FM has told us countless times that they prefer no more than 5 systems off one run-in, actually they prefer less than that when possible. With multiple run-ins if one area's sprinkler system is down for whatever reason, you at lest have hose available from an adjacent area. You need to break up these systems and provide for multiple run-ins. If the fire pump is necessary to make the systems work then I see no problem with submitting a primary and backup fire pump for this size and occupancy of a building. I mean almost a million sq. ft and 10,000 people? What's the value of one life versus a fire pump, for the legal award for one loss you could buy quite a few pumps. Craig L. Prahl, CET Fire Protection Specialist 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.ch2m.com -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of å... .... Sent: Sunday, January 25, 2009 9:25 AM To: [email protected] Subject: when is redundancy a good thing... 1 vs 2 water lead-ins to a building scenario: 820,000 square foot building 4 levels open to each other. multiple occupancy, non-separated more than 10,000 occupants expected building service life: 75 years. Type I-B (IBC) II (2 2 2) NFPA construction Code: NFPA set the water supply to the sprinkerl lateral is looped and redundant, but after that, we are unique. that is, we currently have on the design table, 1 fire pump and 1 fire lateral into the building. My fear is not so much that the fire lateral or spool piece will fail, which in 75 years is a possibilty with high chloride content soil, but that some other trade will break the lateral while digging around for their own system's maintenance. Too conservative in the design choice of redundant fire pump and laterals? Or is it normal and reasonable design for this occupancy and construction to have 1 sprinkler lead-in and 1 fire pump. scot deal excelsior fire engineering _______________________________________________ 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) _______________________________________________ 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)
