🔍 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.