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• Page l of 3 Jim Trussell - Re: HTS Hangar From: "George Crosiar" <george.crosiar@state.or.us> To: "Aron Faegre" <faegre@earthlink.net> Date: 11/07/2011 2:17 PM Subject: Re: HTS Hangar CC: "Rod Yoder" <ryoder@aurorafire.org>, "Jim Trussell" <jtrussell@co.marion.or.us> Aron, I can make this work for what is proposed. Hope this is acceptable to Marion Co. Bldg. I am including them in this e-mail so they are aware of our conversation. I have included a copy of your revised proposal so we all have it for review if needed. Aron Faegre, AIA, PE 520 SW Yamhill Street Portland Oregon 97204(503) 222-2546 FAX/222-6529 faegre@earthlink.net Alternative Methods Appeal for Helicopter Transport Services Hangar, Aurora Airport October 25, 2011 (revised 11-7-11) Code Section being appealed: 412.2.6 Fire suppression. Aircraft hangars shall be provided with fire suppression as required by NFPA 409. The following additional related code items are noted for context in the discussion: a. NFPA 409 does not require foam systems when aircraft in the hangar are defueled. [It is noted that when an aircraft is undergoing major maintenance and overhaul it is defueled per the standards of NFPA 409 in advance. According to the State Fire Marshal and the State Codes officials, the reason for the foam Is when there are 4.1 extremely large amounts of fuel in a hangar, there is a risk of a"pool fire". Foam is not required for similar auto, truck, or bus storage/maintenance areas because it is believed that there is not enough fuel to create a"pool fire" requiring foam to fight it.] b. OSSC 2007 and OSSC 2010 412.2.6 Exception 2 allows any fuelled aircraft in Group I hangars (i.e. larger than 40,000 sf) as long as door less than 28 feet and no major maintenance or overhaul is being done on the aircraft. Proposed Design: 1. Fire water sprinklers upped from normal 0.17 gpm flow to 0.25 gpm flow so that any fire that might occur unrelated to a major fuel fire is more rapidly extinguished. 2. Place a 6 foot x 4 foot sign on four prominent walls of the hangar that says: "Not allowed in this Hangar: 1. Doping.2. Hot work including but not limited to welding,torch cutting, and torch soldering. 3. Fuel transfer. 4. Fuel tank repair or maintenance not including defueled tanks in accordance with NFPA 409, inerted tanks or tanks that have never been fueled. 5. Spray finishing operations. 6. Aircraft with more than 500 gallons fuel, and not more than 7,500 gallons fuel in all aircraft in hangar." 3. Require that an up-to-date worksheet always be present in the hangar for inspection by the Fire Marshal or Building Official that identifies any aircraft in the hangar that has fuel and lists the quantity.This will force monitoring to ensure compliance with keeping total fuel load in hangar under item 6 above. HTS Alternative Methods Construction October 25, 2010 (revised 11-7-11) Page 2 4. Place one 33 gallon foam cart 20-A:160-B in each of the four corners of the hangar and establish an annual training program for all FM licensed mechanics in the facility as to the use of those foam carts (see attached sample catalog cut). Invite fire staff from the Aurora Fire District to each annual training session.This will ensure that the foam carts, staff, and local fire staff are well coordinated. Note that this size foam extinguisher is the standard fire protection for a rooftop helicopter landing facility of H-1 category helicopters per Section 5.7 NFPA 418. • fir Reason for Alternative: 1. The FITS hangars will normally involve only defueled aircraft. So on that basis there is no requirement for foam under NFPA 409. file://C:\Documents and Settings\jtrussell\Local Settings\Temp\GW}00001.HTM 11/07/2011