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CONTINUED | 11 <br />8.4. Dual fuel, natural gas primary and propane <br />secondary: Some applications use a dual fuel system <br />where the primary source may not be available during <br />a power outage. Dual fuel systems use natural gas as <br />the primary fuel and LPG or LPL withdrawal as the <br />secondary fuel. For dual fuel units, the specific fuel <br />pressure, volume, and pipe sizing requirements for <br />each fuel type must be observed. <br />Figure 6: Typical dual-fuel system. <br />Figure 5: Typical LP liquid withdrawal system. <br />Generator Frame <br />FULL FLOW <br />SHUT OFF <br />VALVE <br />The piping system connecting the liquid line from the tank connection to the connection <br />on the generator set, must be sized to provide the correct volume of liquid propane <br />(gallons per hour) to the generator set as noted on the unit specificatotion sheet. <br />Flexable Fuel Line <br />LP FUEL TANK MAXIMUM <br />FILL LEVEL 80% <br />LP tanks set-up to <br />provide liquid fuel are <br />equipped with a dip tube <br />connection to provide <br />liquid withdrawal of fuel <br />from the tank.FULL FLOW <br />SHUT OFF VALVE DRIP LEG <br />Generator Base <br />Mixer/Actuator <br />Liquid <br />Vaporizer <br />Regulator <br />Heated Coolant <br />Connections <br />Unit Mounted <br />Solenoid Stop Valve <br />FULL FLOW <br />SHUT OFF VALVE <br />Flexable <br />Fuel Line <br />Generator Base <br />Unit Mounted <br />Regulator Flexable <br />Fuel Line <br />FULL FLOW <br />SHUT OFF VALVE <br />DRIP LEG DRIP LEG <br />MIXER <br />Primary <br />Regulator Second StageRegulator <br />PIPING FROM LP TANK FIRST STAGE REGULATOR <br />Natural Gas Supply System Design Guide for Generac Industrial Spark Ignited Generators <br />Docusign Envelope ID: 2F58BEE5-DDBE-42EB-8DFA-5E2508488B04