NFPA 13 refers you to 409 (21.27, 2007) for aircraft hangers that are governed by 409. If they are not governed by 409 then they are EH2 per 13. If your hanger is subject to 409 then space according to 409 and you'll be fine since 13 has no applicability.
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 Ray Vance Sent: Thursday, February 25, 2010 2:22 PM To: [email protected] Subject: Aircraft Hangar Question of the Day! To my esteemed colleagues: I have an aircraft hangar I am looking at and would like clarification on sprinkler / branchline spacing. I know what I think ;-) However, I would like the combined knowledge of all of you as to the actual requirements of the NFPA standards. The hangar is a 32,000 suare feet Group-I hanger with a door opening to accomodate a 36 ft tail height. The chosen fire protection scheme is Option-3, a closed-head wet-pipe sprinkler system at .17 gpm / 15,000 square feet and a low-level hi-ex foam system. The building is a metal-purlin building with 25 ft bay spacing. NFPA-409 requires a maximum 130 sf sprinkler spacing with a maximum distance of 12 feet between the sprinklers or the branch-lines. NFPA-409 does not reference NFPA-13 for sprinkler or branch-line spacing. Question: In a building with 25 ft bays would one be allowed to space the branch-lines at 12'-6" as indicated in NFPA-13 for storage bays at 25 feet spacing in lieu of the 12 feet as indicated in NFPA-409? Thanks, Ray Vance - SET Chief Sales Designer Wayne Automatic Fire Sprinklers, Inc. www.waynefire.com<http://www.waynefire.com> 407-877-5563 office 321-436-2184 mobile _______________________________________________ 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)
