🔍 Key Concepts

• Difference between a bottom blow and a surface (continuous) blow on a boiler • Where sludge and sediment tend to collect inside a boiler • What operating problems are linked to dissolved solids/foaming versus settled solids

💭 Think About

• Ask yourself: What part of the boiler is actually reached when you open the bottom blow valve, and what type of contamination would be removed from there? • Which problem on the list is normally handled by adjusting chemical treatment and surface blow, rather than suddenly opening a bottom valve? • Which of these conditions would be most directly improved by quickly discharging water from the very lowest point of the boiler?

✅ Before You Answer

• Identify which option is most clearly related to settled solids at the lowest part of the boiler • Eliminate any options that are usually managed by water level controls or surface blow/chemistry control instead of a bottom blow • Make sure the condition you pick would realistically be corrected by a short, high-velocity discharge from the bottom of the drum