🔍 Key Concepts

• Boiler water treatment and why it's necessary • Effects of scale, sludge, and oxygen on boiler metal and heat transfer surfaces • Difference between preventing a substance from forming and forcing it to form and settle out

💭 Think About

• Think about what happens inside a boiler if you have untreated feed water with dissolved minerals and gases—what damage or inefficiencies can occur? • Which option describes an effect that would actually protect the boiler and improve efficiency, rather than harm it? • Is the goal of chemical treatment to make solids and corrosion worse, or to control where and how they appear (or don’t appear)?

✅ Before You Answer

• Identify which choice would improve heat transfer and protect metal surfaces, not reduce performance. • Distinguish between sludge (solid deposits) and dissolved gases like oxygen—do treatments normally try to create more of these, or control/remove them? • Ask yourself: does this option match what a typical boiler water treatment program is designed to accomplish (corrosion prevention, scale control, and deposit control)?