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Investigation of Probable Cause of Premature Cracking of Downcomer Nozzle of Heat Recovery Steam Generator

  • D. Ghosh
  • H. Roy
  • A. K. Shukla
Case History---Peer-Reviewed

Abstract

The premature failure (cracked) of a downcomer nozzle attached with intermediate pressure drum of heat recovery steam generator was investigated. The conventional wet fluorescent magnetic particle and dye-penetrant testing along with macro analysis, sulfur print, and microstructural examination were used in the investigation. In addition, energy dispersive spectroscopy was also carried out to understand the reason of premature failure. Finally, it was concluded that presence of excessive multiphase inclusions containing manganese in localized areas caused formation of cracks at those locations during forging.

Keywords

Downcomer nozzle HRSG Failure EDX Inclusions 

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Copyright information

© ASM International 2009

Authors and Affiliations

  1. 1.NDT & Metallurgy GroupCentral Mechanical Engineering Research Institute, CSIRDurgapurIndia

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