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<strong>Case</strong> 5: The SH coil bends had come close to<br />
the casing, that the bends had got eroding. The<br />
shields were not placed properly during a<br />
maintenance & it led to failure of SH.<br />
<strong>Case</strong> 6: The protection shield at bends was not<br />
placed properly during maintenance. This had<br />
led to a stoppage of the plant. There is a gas<br />
baffle to prevent the gas going along the<br />
bends.<br />
<strong>Case</strong> 7: <strong>Erosion</strong> at the top rows of a convection phenomenon depends on the arrangement of<br />
pressure parts layout. A shabby work of shields can lead to poor availability of the boiler. We<br />
can see how the shields are disoriented. The waterwall is seen eroded due to shields. The<br />
distorted shields have led to multiple failures within the bank. Simply all the shields were<br />
removed and all tubes were replaced in a scheduled manner.<br />
Planned replacement of tubes can improve the availability of the boiler than simply resorting to<br />
shields. Shields & baffles are to be engineered depending on various parameters, such as present<br />
velocity & temperature profile, tube to tube clearances.
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