Which condition increases the likelihood of carryover?

• A. High boiler water solids
• B. Low boiler water solids
• C. Very low steam rate
• D. High feedwater temperature

Answer: (A)

Carryover happens when boiler water droplets and dissolved solids are carried into the steam. The biggest factor is how concentrated the boiler water is with solids. When boiler water has high solids, foaming and priming become more likely, and minerals can be carried with the steam as it forms. That’s why high boiler water solids increases the chance of carryover—there’s more material available to be entrained and to appear in the steam. In contrast, having low solids means less material to carry; a very low steam rate reduces the energy that could lift droplets into the steam; and high feedwater temperature doesn’t inherently raise carryover.