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Tube Failures in a Paper Mill Black Liquor Boiler

A major paper and pulp mill experienced degradation of steam tubes in a black liquor recovery boiler. APTECH was retained by the paper mill's insurance carrier to determine if the cause of the tube degradation was due to inadequate boiler design or to plant operations. Our investigation included a site visit, during which time we reviewed plant operations and the recovery boiler design. We also investigated current boiler operating practices and compared these to the design conditions. Recommendations were made to mitigate the degradation.

Satish Almaula		Plant failure and root cause analysis; process and design engineering analysis; process technology development and testing; plant engineering, operations, maintenance and safety management; plant and process control system management.

Eric Sullivan, P.E.		Metallurgy, welding, failure analysis, fire and explosion investigations, equipment, piping.

Philip Lindsay, P.E.		Corrosion failure analysis, metallurgy, piping systems, corrosion mitigation, materials selection.

Steve Paterson		Metallurgy, welding, boiler pressure part and machinery failure analysis.

Geoffrey Egan, Ph.D.		Engineering mechanics, welding engineering, stress and fatigue analysis, risk analysis, nondestructive examination, project management.