You can't get 4800-gpm at 20-psi with that flow test, no matter what you do (the best you can do is 4018-gpm); and you can't get 4800-gpm through that fire pump, no matter what you do. The city wants their Needed Fire Flow for the building and there are several methods to figure the NFF but most municipalities get it from a chart in the IFC. I had a project where the water supply from the city was not adequate to meet the NFF for the project. The only thing to do is to store water or get a variance.
Mark Hasenmyer, PE MEH Fire Protection Engineering LLC 1311 River Oaks Drive Flower Mound, TX 75028 Office (972) 874-2662 Fax (972) 874-5591 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bobby Gillett Sent: Wednesday, October 03, 2007 7:14 AM To: [email protected] Subject: Fire Flow requirements Hello Forum, I have a situation where a city is requiring 4800 gpm to be flowed @ a min of 20 from all hydrants within 500 ft of the bldg. This particular bldg has 5 hydrants on a 12" city line. I have received a flow test of 96-S 64-R 2519-GPM and set all five hydrants to flow 960 GPM. This will not produce the requirement. We do have a pump being installed inside the bldg.(2000 GPM / rated pressure of 60). If I pipe out from the pump room and add hydrants around the bldg. I still cannot meet this requirement. Has anyone run into this problem or had a similar situation? Any suggestions? Bobby Gillett Project Manager [EMAIL PROTECTED] (731)-424-0130 _______________________________________________ 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)
