🔍 Key Concepts

• Fuel oil heater operation and purpose of the steam drain system • Risk of fire and explosion when oil leaks into steam or drain systems • Principle of removing the source of contamination before taking secondary actions

💭 Think About

• Which action will most directly stop or isolate the source of oil entering the steam drain system? • Which choice focuses on safety and containment first, rather than cleaning up or adjusting boiler operation? • Does any option risk spreading the contamination (oil) further into the system or increasing boiler/fire risk?

✅ Before You Answer

• Identify which option immediately isolates the faulty heater from the system. • Check which action avoids putting more oil into the contaminated drain line or boiler. • Confirm that the first step should eliminate the leak path before any boiler blowdown or fuel suction changes.