Page 72 - Handbook of Materials Failure Analysis
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66 CHAPTER 3 Boiler tube failures: Some case studies
FIGURE 3.20
Micrograph showing ferrite and partial breakdown of pearlite.
FIGURE 3.21
Micrograph showing ferrite and pearlite.
corrosive contaminants within deposits on the inner tube wall. Deposits are formed
from feed water system corrosion from condenser in-leakage constituent.
Corrective action involves the restoration of boiler water chemistry to the proper
values and the consideration of boiler chemical cleaning. Chemical cleaning are per-
formed to remove the internal deposits and to further generation of hydrogen on the
tube surface.
