🔍 Key Concepts

• Trace the seawater flow path from the feed side (valves A–H) through to the evaporator/condenser section (valves J–M). • Identify which lines are for inlet/feed, which are discharge/brine, and which are bypass or isolation for securing the plant. • Think about what must be open for normal distillation operation versus what would only be used for dumping, draining, or testing.

💭 Think About

• Looking at the illustration, which single path takes seawater from the feed pump, through the heater/condenser, and then overboard or to brine discharge? Match that path to the valve letters in the choices. • For each choice, ask yourself: does this combination leave any part of the flow path blocked (a dead end) or does it unintentionally bypass the evaporator/condenser? • Which valves (D, H, I, etc.) appear to be in lines that could be used as alternate suction/discharge or recirculation rather than the normal operating line?

✅ Before You Answer

• Verify which side of the plant (top vs bottom of the condenser/evaporator) represents seawater cooling and which represents evaporator feed/brine discharge. • Check that your selected arrangement provides a complete, continuous path: from the feed source, through the evaporator/condenser, and out via the discharge, with no required valve left closed. • Confirm that none of the opened valves in your chosen option would allow flow to bypass the distillation unit entirely (i.e., straight from suction to discharge without going through units 23 and 24).