PUMP GP-PISTON 3406184 - Caterpillar

Changeover From HFO To Distillate Fuel With The Engine Running At 50 Percent Of Rated Load
1. Set the changeover valve time control for 45 to 50 minutes.2. Make sure that all distillate fuel line to booster module valves are OPEN.3. Change the fuel selector switch on the booster module control box from heavy to distillate.4. Monitor fuel temperature and viscosity during the changeover period. Adjust the bypass valve in the fuel lines to balance the fuel supply pressure to each engine at 550 to 620 kPa (80 to 90 psi).5. When the fuel viscosity is reduced to ten cSt, the fuel cooler should be opened slowly, allowing a full parallel connection with the fuel cooler.6. When the fuel viscosity reaches eight cSt, the steam feed to the Vokes filter should be slowly closed.7. When the fuel flow is totally through the fuel cooler, the viscosity will continue to reduce to a final level of four to five cSt. After the final viscosity level of four to five cSt is reached, operate the engine at constant load for 15 minutes to ensure full clean out of heavy fuel prior to reducing the load or increasing the load.8. If reducing the load to stop the engine, unload the engine and allow an appropriate cool down period before shutting the engine off.9. After the engine has stopped, close the fuel supply and fuel return lines at the engine. Close the injector tip cooling supply and return lines.Changeover From Distillate Fuel To HFO With The Engine Running At 50 Percent Of Rated Load
1. With the engine(s) running at 50 percent of rated load, move the fuel selector switch on the booster module from distillate to heavy fuel.2. Monitor fuel temperature and viscosity during the changeover to heavy fuel. Maintain the fuel supply pressure to each engine at 550 to 620 kPa (80 to 90 psi). Adjust the fuel bypass valve if necessary. Fuel temperature and viscosity should change at the same rate. Check the fuel valve routing. Sufficient fuel should be routed through the fuel cooler before returning to the booster module. Make sure fuel viscosity stabilizes at approximately 15 to 20 cSt at the unit injector.3. When everything is stable after the changeover, close the distillate fuel supply line valve to the booster module.Changeover From HFO To Distillate Fuel With The Engine Stopped
This procedure is based on the engine being previously stopped while operating on heavy fuel and the jacket water heater is operating.
1. Adjust the engine's fuel supply line from heavy to distillate fuel. The clean, distillate fuel will become contaminated with heavy fuel while the engine's fuel system is being flushed. Adjust the fuel return line to return the fuel to the heavy