A recent failure from the roof tube section of No. 3 Boiler at IHDNSWC, Indian Head, MD occurred. Evaluation of the tube failure indicated extremely heavy waterside deposits that had migrated from other areas of the boiler. These deposits led to local overheating and creep rupture on the hot crown of the roof tube. Waterside pitting accentuated the applied tube stresses and decreased the time to rupture. The boiler should be examined for other occurrences of heavy boiler deposits. Affected roof tube sections should either be removed or the boiler chemically or mechanically cleaned.
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