🔍 Key Concepts

• Carryover in a boiler (what it is and why it happens) • Effect of water quality/contaminants on steam purity • How operating conditions (load, chemistry control) influence foaming and priming

💭 Think About

• Which choice directly leads to water droplets or impurities being carried with the steam, instead of dry steam? • Among the options, which factor most strongly promotes foaming or priming at the water surface inside the drum? • Are any of the choices actually routine or even desirable conditions in normal boiler water treatment and operation?

✅ Before You Answer

• Clarify the difference between normal treatment chemicals and contaminants in boiler water • Think about which condition would most likely create wet steam or visible water carryover into the steam line • Ask: does this factor primarily change the chemistry of the water surface in a way that encourages foam, or is it mostly about efficiency/ corrosion control?