08-01-2022 Council Work Session Packet

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Custom Fire Apparatus, Inc. The frame shall consist of double rails running parallel to each other with cross members forming a ladder style frame. The frame rails shall be formed in the shape of a "C" channel, with the outer rail measuring 10.25 inches high X 3.50 inches deep upper and lower flanges X 0.38 inches thick with an inner channel of 9.44 inches high X 3.13 inches deep and 0.38 inches thick. Each rail shall be constructed of 110,000 psi minimum yield high strength low alloy steel. Each double rail section shall be rated by a Resistance Bending Moment (RBM) minimum of 3,213,100 inch pounds and have a minimum section modulus of 29.21 cubic inches. The frame shall measure 35.00 inches in width. Proposals calculating the frame strength using the "box method" shall not be considered. Proposals including heat treated rails shall not be considered. Heat treating frame rails produces rails that are not uniform in their mechanical properties throughout the length of the rail. Rails made of high strength, low alloy steel are already at the required yield strength prior to forming the rail. A minimum of seven (7) fully gusseted 0.25 inch thick cross members shall be installed. The inclusion of the body mounting, or bumper mounting shall not be considered as a cross member. The cross members shall be attached using zinc coated grade 8 fasteners. The bolt heads shall be flanged type, held in place by distorted thread flanged lock nuts. Each cross member shall be mounted to the frame rails utilizing a minimum of 0.25 inch thick gusset reinforcement plates at all corners balancing the area of force throughout the entire frame. Any proposals not including additional reinforcement for each cross member shall not be considered. All relief areas shall be cut in with a minimum 2.00 inch radius at intersection points with the edges ground to a smooth finish to prevent a stress concentration point. FRAME CLEAR AREA The chassis frame shall be left clear of chassis mounted components between the centerline of chassis and the left hand frame rail from 34.00 inches forward of the centerline of rear axle to 46.00 inches forward of the centerline of rear axle for OEM installed components. FRAME PAINT The frame shall be hot dip galvanized prior to assembly and attachment of any components. The components that shall be galvanized shall include: • Main frame "C" channel or channels • Front splayed rails and fish plates • Cross members (excluding suspension cross members) • Cross member gussets • Fuel tank mounting brackets • Fuel tank straps (unless material/finish is specified in 3130 subcat) • Air tank mounting brackets (unless material/finish is specified in 3205, 3305, or 2232 subcat) • Exhaust mounting brackets • Air dryer bracket 07/26/22 -31-