🔍 Key Concepts

• Follow the piping lines from the symbol labeled "DEAERATOR" to see which major components it directly serves. • Recall that a deaerator is normally placed in the hotter, main closed fresh‑water system where dissolved gases (like oxygen) are most likely to cause corrosion. • Notice which system also supplies heat to the evaporator (EVAP) for freshwater production, and which engine components are tied into that loop.

💭 Think About

• From the deaerator symbol, which engine component does the cooling water next flow to—main engine jackets, fuel injectors, SSDGs, or pistons? • Which of the four listed subsystems would logically be large, hot, and important enough that you would want to remove dissolved gases from its cooling water? • Look at where the expansion tank on the right side of the diagram connects—does that expansion tank serve the same circuit that contains the deaerator?

✅ Before You Answer

• Verify which cooling loop the deaerator is drawn in by tracing only the solid lines (ignore dashed lines showing alternatives or vents). • Confirm which items are clearly labeled in the same circuit as the deaerator (e.g., EVAP, turbocharger, main engine, etc.). • Before choosing, be sure that the subsystem you pick is the one whose return or supply line actually passes through the deaerator symbol on the diagram.