3003 W CASINO RD BLDG 45-01 2018-09-20

The Boeing Company P.O.Box 3707 Seattle,WA 98124-2207 March 9, 2006 , (� GPNPP-06-0309 `- RAAR Mr. Tony Lee En n Prb P EV RE ces City of Everett Building Department 3200 Cedar St. Everett, WA Subject: The Boeing Company, Everett Paint Hangars, Buildings, 4 BOE//VG ,4--83 and 45-04 Hazardous Classification Areas and Related Code Issues Reference: Meeting, Sept. 19, 2005 with Dirk Fieldcamp, Tony Richter, John Wood, et al from Boeing Dear Mr. Lee, As discussed in the reference meeting, the Boeing Company is in the process of upgrading the Paint Hangars at the Everett site. The design review process has revealed the use of non-rated equipment in the outer edge of the Class 1, Division 2 area. Based on the testing results obtained, we would like to request a change to the paint hangar Class 1, Division 2 area, and additionally, we would like to address the occupancy classification of this building, quantities of flammable liquids in storage and use, as well as the requirements for smoke vents and draft curtains. Hazardous Classification The design review process has revealed the use of non-rated equipment in the outer edge of the Class 1, Division 2 area as defined by the 2005 NEC. The Class 1, Division 1 area will continue to extend to 5 feet from the airplane surface. We have reviewed the NFPA codes in depth to look for ways of safely reducing the Class 1, Division 2 hazardous area. The National Electrical Code (NEC) Article 500.5 (B) (2) (3) states the following: "A Class 1, Division 2 location is a location That is adjacent to a Class 1, Division 1 location, and to which ignitable concentrations of gases or vapors might occasionally be communicated unless such communication is prevented by adequate positive-pressure ventilation from a source of clean air and effective safeguards against ventilation failure are provided.