Keep in mind that when you have a greater hazard in an otherwise lesser hazard area, you still need to condier the water supply requirements for the greater area.
Your design area should include the 800 sq.ft. of storage area (with the sprinklers discharging at their appropriate density) and then add sprinklers in the light hazard area (with the sprinklers discharging at their appropriate density) until you reach your required design area of discharge. This will then dictate your required system demand AND your hose demand as well. Your hose demand should be appropriate for your larger hazard (ie-250 gpm for ordinary hazard) AND your duration should be that which also corresonds to your greater hazard. I know there are times when the "larger hazard" is small, such as ONE or TWO sprinklers in a SMALLER storage room, and at that time sound engineering judgements need to be made regarding the statements above, but the direction from the NFPA standards is pretty clear in this area when you have different hazards within the same area or areas. Thanks, Ray Vance Chief Engineering Tech. Wayne Automatic Fire Sprinklers, Inc. www.waynefire.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dewayne Martinez Sent: Wednesday, January 10, 2007 4:30 PM To: SprinklerFORUM Subject: water supply duration What would the appropriate water supply duration be for a building overall light hazard occupancy but with a storage room of approximately 800 sq ft in it. I need to size a water storage tank and 30 vs.. 60 min makes a difference. I saw the hose demand exception in NFPA for rooms less than 400 sq ft. but this did not address the duration. I tried to access the archives but they seem to be down. Any help and possibly a NFPA reference # would be appreciated. Thanks Dewayne _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum Wayne Automatic Fire Sprinklers, Inc. 2006 Inductee into "The Players Hall of Fame" at The Great Games of Business Wayne Automatic Fire Sprinklers, Inc. "Best Places to Work" Rated #1 in 2006 Large Business Category by Orlando Business Journal _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
