🔍 Key Concepts

• Trace the sea water piping color and line style from the sea chest / sea water pumps to the various coolers. • Compare the connections of the central cooling water system versus the jacket cooling water system in the legend. • Notice which coolers are on the primary (sea water) side and which are on the fresh water / central cooling side of the system.

💭 Think About

• From the sea water pumps, which single heat exchanger do the teal-colored lines enter and leave directly? • For each of the four listed coolers, is it cooled by sea water directly, or by cooled fresh water coming from somewhere else? • Look at the legend: which line style goes into the M/E jacket water, camshaft lube oil, and M/E lube oil coolers—does that match sea water or central cooling water?

✅ Before You Answer

• Verify which line color and type represents sea water using the legend at the top left. • Confirm that only one cooler has sea water directly on one side, while the others are supplied by central cooling water (dashed line). • Before choosing, make sure you can point to the exact path: sea chest → sea water pump → [your chosen cooler] → overboard.