Is the building considered a high-rise? Is the Class I standpipe system an automatic or manual water supply?
The collective intent of 13 and 14 is that you have to hydraulically prove the most demanding condition(s) of the sprinkler and standpipe systems individually, but not concurrently. So if you're hydraulically calculating the Class I standpipe component you need to know if you're calculating from the automatic source or the FDC (manual system). To add Class II components, you will have to do an automatic calculation in accordance with 14. For the sprinklers, you would design hydraulically per 13. Contrary to popular practice, you don't have to take an inside hose when you have a sprinkler system, only when you have hose valves supplied by a sprinkler system that are not considered a standpipe system. The foregoing is my opinion only and does not necessarily represent the opinion or intent of the NFPA 14 Technical Committee on Standpipe and Hose Systems. Steve Leyton Protection Design & Consulting San Diego, CA -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Thursday, April 21, 2011 12:56 PM To: [email protected]; [email protected] Subject: Combination standpipe riser & hose flows Admittedly I'm kind of at an impasse. I've got a 4 level open process structure. Top level is about 85ft above grade. Non-occupied. The structure is provided with a dry sprinkler system and has 2.5" hose outlets at intermediate landings. The owner has requested 1.5" hose reels at each floor for their responders. The area of the upper floor is only about 1400 sq. ft. Due to obstructions and some equipment that requires impingment protection the number of heads flowing is about 33. The structure is fully sprinklered. When calculating the sprinkler flow I'm trying to decipher the text in NFPA 13 and 14 (2010) concerning how to include or not, the flow and pressure required for the 2.5" hose connections. If I flow 500 gpm through the top two 2.5" valves I'm good. If I have to provide for 250 gpm in addition to the sprinkler flow I'm good. Where I'm in the toilet is if I have to provide that 2.5" valve at 250 gpm AND at 100 psi. 13 makes it sound like I don't have to include the hose flow if my sprinkler flow is the higher value NFPA 13-2010 12.8.5(2) but this is referring to wet system, no reference to dry systems. But if that is true, and I don't have to include the extra hose flow, do I still need to provide 100 psi at that outlet? Am I missing something here? Is it assumed there will be simultaneous flow of the 2.5" hose AND sprinklers? 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 [email protected] _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.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 [email protected] http://fireball.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)
