When running a large, dual fuel, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching from heavy fuel oil to diesel oil?
• Behavior of viscosity and temperature for heavy fuel oil vs. diesel oil • Purpose of fuel heaters / preheaters in large slow-speed diesel engines • Risks of thermal shock and fuel pump/injector damage during changeover
• How does the required temperature of heavy fuel compare to diesel oil for proper atomization and viscosity? • What happens to fuel system components if you suddenly change fuel temperature or viscosity too quickly? • During a proper changeover, what should you do with the heating system as the fuel type at the three-way valve changes?
• Compare the normal operating temperatures for heavy fuel oil and marine diesel oil in the same engine • Consider whether a gradual or sudden change in temperature is safer for the fuel system • Think about whether some mixing of heavy fuel and diesel is normal and even necessary during a controlled changeover
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