🔍 Key Concepts

• Low pressure distilling plant operation and purpose • Meaning of brine overboard density and what it indicates about concentration • Effect of scale formation and high salinity on heat transfer and plant capacity

💭 Think About

• Think about what happens to heat transfer surfaces when the brine leaving the evaporator becomes more and more concentrated. • Which condition would most likely lead to faster scale buildup inside the plant and therefore reduce efficiency and output? • How does the density (concentration) of the brine overboard relate to safe, efficient operation versus operating the plant too close to scaling limits?

✅ Before You Answer

• Identify which choice represents high brine concentration versus relatively low brine concentration. • Recall the typical maximum recommended brine density for efficient distiller operation before scaling risk becomes serious. • Confirm which options (if any) describe normal/desired operating conditions versus a condition that would clearly cause reduced capacity and more frequent cleaning.