🔍 Key Concepts

• Fuel isolation procedures for boilers • The purpose of safety interlocks vs. manual valves • What must be done before opening or working on a burner assembly

💭 Think About

• Ask yourself: What is the first, most critical step to prevent fuel from entering the burner while you’re working on it? • Which option could actually create a false sense of safety if you rely on automatic systems instead of manual isolation? • Which choice removes the immediate energy/fuel hazard at the exact place you are going to work?

✅ Before You Answer

• Verify which step provides positive manual isolation of the fuel supply to the burner. • Check if any option would defeat safety devices instead of using them properly. • Confirm which action is standard practice before maintenance on fuel-burning equipment, not just during normal operation.