🔍 Key Concepts

• Fuel oil service pump relief valves – purpose and normal discharge locations • Difference between recirculating within the system vs. sending oil back to storage or settling tanks • Why relief valves should avoid sending high-pressure discharge directly into tanks that are not designed for that pressure

💭 Think About

• Which option would safely handle sudden overpressure without risking tank damage or fire hazard? • Which destination would keep the fuel supply system stable while avoiding large temperature shocks or aeration of stored fuel? • Think about where excess fuel from recirculating systems commonly goes so it can be reused without contamination issues.

✅ Before You Answer

• Verify which line or tank is normally low-pressure and already connected into the fuel circulation/return system • Eliminate any option that would introduce high-pressure flow into a tank not designed as a relief destination • Check basic fuel system diagrams: where do return/overflow lines typically go from service/booster pumps?