Jim, If you look at NFPA 409 Group III hangars are only required to have sprinkler systems installed when the list of hazards exist. If the hangar is used for storage only then the sprinkler system is not required. If you are installing a sprinkler system anyway I would use the .17 gpm/sqft over 5000 sqft, which is better than the extra hazard group 1 criteria. As an AHJ I would allow either to be used.
Duane Fox, Jr. DE State Fire Marshal's Office -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Phelps, Mark Sent: Tuesday, September 02, 2008 6:39 PM To: [email protected] Subject: RE: Protection of Group 3 Aircraft Hangars Jim, The design requirements for a group III hangar are in NFPA 13, I believe it is Extra Group II but look it up. Somewhere in the gobbledigook of NFPA 409 it refers you to 13 for the design requirements, but I don't remember where. Mark -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Thiesse, Jim Sent: Tuesday, September 02, 2008 3:21 PM To: [email protected] Subject: Protection of Group 3 Aircraft Hangars I could use some help regarding NFPA 409, specifically the design requirements for a group 3 aircraft hangar. I found the requirements for hangar groups 1&2, but section 8.9 (FIRE PROTECTION FOR GROUP 3 HANGARS) says: 8.9.1* <javascript:parent.loadDoc('/nfpa0400-0499/0409/codes-0197222',%20'',%20 'codes-id00040901511')> Where hazardous operations, including fuel transfer, welding, torch cutting, torch soldering, doping, and spray painting, are performed in any Group III hangar, the Group III hangar shall be protected with the fire protection specified in Chapter 7 <javascript:parent.loadDoc('/nfpa0400-0499/0409/codes-0196850',%20'/',%2 0'codes-id00040900688')> and also shall meet the requirements specified in 5.4.2 <javascript:parent.loadDoc('/nfpa0400-0499/0409/codes-0196560',%20'/',%2 0'codes-id00040900166')> . What if it's just a storage hangar and the above listed operations are not expected? Group 2 hangars require a .17/5,000 sq. ft. Does that also apply to ALL group 3 hangars? In NFPA 13 under extra hazard (group 1) occupancies it lists aircraft hangars (except as governed by NFPA 409). I don't see any exceptions in NFPA 409 exempting any hangars. Any help would be appreciated. Thanks, Jim Thiesse _______________________________________________ Sprinklerforum mailing list http://lists.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 http://lists.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 http://lists.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)
