13-494 Log #356 AUT-SSD Final Action: Accept (23.1.2) ________________________________________________________________ Submitter: Kenneth E. Isman, National Fire Sprinkler Association, Inc. Recommendation: Revise text to read as follows: 23.1.2 Capacity. Water supplies shall be capable of providing the required flow and pressure for the remote design area determined using the procedures in Chapters 11 through 22 for the required duration as specified in Chapter 11, Chapter 12 and through Chapter 21. Substantiation: The water supply only needs to provide the duration for the remote area, not the closer sprinklers in the system that will discharge more water. Also, all of the discharge chapters need to be specified, not just the basic storage Chapter 12. Committee Meeting Action: Accept Number Eligible to Vote: 25 Ballot Results: Affirmative: 22 Ballot Not Returned: 3 Brown, T., Hogan, A., McNamara, T.
Bill Brooks William N. Brooks, P.E. Brooks Fire Protection Engineering Inc. 372 Wilett Drive Severna Park, MD 21146-1904 410-544-3620 410-544-3032 FAX 412-400-6528 Cell -----Original Message----- From: sprinklerforum-boun...@firesprinkler.org [mailto:sprinklerforum-boun...@firesprinkler.org] On Behalf Of craig.pr...@ch2m.com Sent: Tuesday, August 09, 2011 1:14 PM To: sprinklerforum@firesprinkler.org Subject: RE: Water storage Assuming Ord. II at .20/gpm sf over 1500 sf would be 300 gpm flow rate minimum. Now remember that sprinkler system flows will always exceed the base design criteria because the .20gpm/sf is the hyd. remote sprinkler and those upstream will put out more. So typically you will see a 10-15% overage in actual system flow. To be conservative for a wet system if you take that 300 gpm and than increase that by 15% you'd get 345 gpm. Just say 350 for simplicity. Then add the 250 gpm for hose stream allowance and you've got 600 gpm total system demand. For total capacity at 60 minutes (IF THE SPRINKLER SYSTEM WATERFLOW, TAMPER SWITCHES AND SUPERVISORY DEVICES ARE ELECTRICALLY SUPERVISED) 600 GPM X 60 MINUTES = 36000 gallons. If you have to use the higher value you'd be looking at 54000 gallons. Fire department hydrant hose streams fall under the category of Fire Flow within the Fire Code. This is a whole other topic of discussion that can get rather muddied and is very often totally overlooked by the EOR or others designing underground fire service piping systems. If the local Fire Service requires a site or building to provide Fire Flow the flow rates and durations can be considerably higher. One recent project I had was requiring over a million gallons of storage for fire flow based on unprotected building size and construction types. IFC Appendix "B" was applied as the "approved method". I have encountered few fire protection system designers and engineers who understand or even implement the fire flow section of the Code. Craig L. Prahl, CET Fire Protection CH2MHILL Lockwood Greene 1500 International Drive Spartanburg, SC 29304-0491 Direct - 864.599.4102 Fax - 864.599.8439 CH2MHILL Extension 74102 craig.pr...@ch2m.com -----Original Message----- From: sprinklerforum-boun...@firesprinkler.org [mailto:sprinklerforum-boun...@firesprinkler.org] On Behalf Of A.P.Silva Sent: Tuesday, August 09, 2011 12:41 PM To: sprinklerforum@firesprinkler.org Subject: Water storage The duration of water supply for a hydraulically calculated ord. hazard sprinkler system is 60 to 90 minutes. So if the sprinkler demand is 250 gpm the required water storage is 15,000 gallons using the lower duration. There used to be a requirement (which I don't see now) that the water supply should be 150% of the pump rating. Is that still required? The rated capacity of the pump in this case is 250 gpm. Also, is 60 minute duration enough for fire department hose streams? So, water storage for hose streams is another 15,000 gallons? Tony _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: supp...@firesprinkler.org To Unsubscribe, send an email to:sprinklerforum-requ...@firesprinkler.org (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: supp...@firesprinkler.org To Unsubscribe, send an email to:sprinklerforum-requ...@firesprinkler.org (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: supp...@firesprinkler.org To Unsubscribe, send an email to:sprinklerforum-requ...@firesprinkler.org (Put the word unsubscribe in the subject field)
