🔍 Key Concepts

• coil-type forced circulation boiler design and flow path • difference between steam circulation and water/steam mixture circulation • purpose of a flash chamber in some boiler systems

💭 Think About

• Think about what is being circulated in a coil-type forced circulation boiler: is it steam, water, or a mixture? • Which option describes what happens to water that has NOT yet turned into steam in this kind of system? • Does a compact auxiliary water-tube boiler normally have faster or slower response to steam demand compared with a fire-tube boiler?

✅ Before You Answer

• Identify which choice correctly describes the role of the coils in this boiler type. • Check which option would waste feed water and whether that would make sense in normal boiler operation. • Compare typical response time characteristics of water-tube vs fire-tube boilers before choosing.