🔍 Key Concepts

• Purpose of recirculating fuel oil before a cold boiler start • Effect of fuel oil temperature and viscosity on burner performance and atomization • Which components (fans, meters, heaters) are directly involved with fuel circulation versus combustion air

💭 Think About

• Ask yourself: Before ignition, what is the MAIN reason we recirculate fuel oil through the system? Heating, measuring, or supplying air? • Which choice would best help get the fuel oil to the correct temperature and viscosity for good atomization at start-up? • Which items on the list (forced draft fan, meter bypass, heater bypass) are normally adjusted only when you are actually preparing to FIRE the boiler, not just recirculating fuel?

✅ Before You Answer

• Verify which device directly changes fuel oil temperature/viscosity (not air flow or fuel measurement). • Check which action would be counterproductive to warming cold fuel oil before start-up. • Confirm standard boiler light-off procedures in your steam plant manual or training materials regarding fuel heater line-up during recirculation.