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City of South Bend, IN <br />Bid Exceptions and Other Required Additional Information <br />RE: Vacuum Air Street Sweeper Bid <br />• Engine (cont'd) <br />o 2000 Engine rpm required for impeller fan speed of 3,400 rpm. <br />• Blower <br />o Blower is direct drive through step-up gear box. There are no belts, which means <br />a more efficient transfer of horsepower to the blower and decreases fuel <br />consumption. This system requires no adjustments and maintenance interval is <br />500 hours. Layout diagram is as follows; <br />AUX ENGINE STEP-UP GEAR BOX SYSTEM <br />1 <br />1 engine <br />2 coolingffan <br />3 splined shaft <br />4 exhauster fan impeller <br />5 step-up gearbox <br />6 fluid flywheel coupling <br />i gear -driven hydraulic pump <br />• Blower <br />o Engine RPM requires for impeller to reach 4000 rpm is 2,234 RPM. <br />0 20,000 CFM is achieved at an impeller speed of 3,400 RPM <br />• Sweep Path <br />o Minimum sweep with nozzle only: 31" <br />o Maximum sweeper: 144" <br />• Dust Separator <br />o Centrifugal dust separator not provided. Centrifugal dust separators are not <br />required on pure vacuum street sweepers to achieve dust separation from the <br />air stream. <br />• Wide Sweep or Extension Broom: <br />