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DNB

Under normal conditions steam bubbles are formed in discrete parts. Boiler water solids develop near the surface . However on departure of the bubble rinsing water flows in and redissolves the soluble solids. However at increased rates the rate of bubble formation may exceed the flow of rinsing water , and at higher still rate, a stable film may occur with corrosion concentrations at the edge of this blanket. The magnetite layer is then attacked leading to metal loss.
The area under the film may be relatively intact.

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DEPARTURE FORM NUCLEATE BOILING

Under normal conditions steam bubbles are formed in discrete parts. Boiler water solids develop near the surface . However on departure of the bubble rinsing water flows in and dissolves the soluble solids. However at increased rates the rate of bubble formation may exceed the flow of rinsing water , and at higher still rate, a stable film may occur with corrosion concentrations at the edge of this blanket. The magnetite layer is then attacked leading to metal loss.
The area under the film may be relatively intact.
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