🔍 Key Concepts

• 46 CFR Subchapter F – Marine engineering regulations for boilers and machinery • Purpose of a flame safeguard system on an automatic boiler • Required shutdown response time when flame is lost

💭 Think About

• Ask yourself: What is the primary safety purpose of a flame safeguard system – to restart the boiler, to sense temperature in a stack, to limit ignition time, or to quickly stop fuel when there is no flame? • Compare each choice with a worst-case scenario: a flame goes out but fuel keeps flowing. Which option directly addresses this specific danger? • Think about time: which function of the safeguard must happen very quickly to prevent an accumulation of unburned fuel in the furnace?

✅ Before You Answer

• Identify which option deals with fuel shutoff after flame failure, not normal operating features like relighting or water level protection. • Check which choices mention a maximum time limit and decide which time limit is reasonable to prevent a fuel-rich, explosive mixture. • Eliminate any answer that describes a feature normally handled by a different protective device (e.g., low water cutoff, stack switch, or ignition programmer), not the flame safeguard itself.