An Assessment of the Severity of a Metal Loss Defect Detected on the Steam Boiler Drum of a Thermoelectric Power Plant and the Development of a Repair Technology.

In this paper we present an assessment procedure consistent with the level 3 methods recommended by API 579 / ASME FFS-1, of a local metal loss defect detected on the outer surface of the steam boiler drum mantle of a thermoelectric power plant. We analyze several solutions for corrective maintenance work to restore and re-commission the drum mantle. In selecting the optimal solution conforming to the requirements of the ISCIR PT C1-2003 and C4/2-2003 Technical Prescriptions we employed criteria addressing mainly the welding suitability and the behavior of the materials involved, during and after welding. [ABSTRACT FROM AUTHOR]