🔍 Key Concepts

• Function of a fuel oil heater relief valve and where it discharges when it opens or leaks slightly • Difference between normal flow path of fuel oil and leakage/by-pass paths (to drain, return, or sludge systems) • What parameter would show a gradual increase over time if small amounts of fuel are continuously leaking

💭 Think About

• If a relief valve is leaking slightly, where does that leaking fluid actually go in this system? Trace the piping mentally. • Which of the listed tanks or lines would receive unintended oil from a relief valve on the fuel oil heater? Think about what each tank is normally used for. • Which option reflects something that would collect liquid over time, rather than just change temperature or pressure locally?

✅ Before You Answer

• Verify which tanks (e.g., contaminated drain tank, sludge tank) are connected to heater and purifier drains on a typical fuel oil system. • Check whether a leaking relief valve would more likely cause a level change in a tank or a change in temperature/pressure in a line. • Confirm which of the listed choices is specifically intended to collect leaked or contaminated oil from equipment like heaters and filters.