🔍 Key Concepts

• Study the right-hand side of the diagram where items 21 and 22 are located and trace the piping connected to each component. • Think about what normally has to be removed continuously from a distillation condenser: one line for liquid brine and another for non‑condensable gases/air. • Use the direction of flow arrows and connection points (top of condenser vs. bottom/drain points) to infer whether each device is handling liquid or gas.

💭 Think About

• Follow the line from the condenser shell (24) to items 21 and 22. Does it come from a high point (gas vent) or a low point (liquid drain)? • Look at where the outlet from 21/22 discharges. Does it tie into a drain/overboard/brine line or a suction line to a vacuum/air ejector? • Ask which answer choices describe two different things being removed versus the same thing from two places, and compare that to how many separate lines you see feeding 21 and 22.

✅ Before You Answer

• Verify which of 21 and 22 is connected to the top of the condenser (likely removing a gas) and which is connected to the bottom/side (likely removing liquid). • Confirm whether the discharge from these items goes to a brine overboard/drain or into a suction/vent line associated with vacuum equipment. • Before choosing, be sure that your option matches two distinct removal functions you can clearly trace on the schematic, not just a guess based on terminology.