Journal of Failure Analysis and Prevention

, Volume 12, Issue 3, pp 300–304 | Cite as

De-nickelification of 70/30 Cupronickel Tubing in a Cooling Heat Exchanger

  • Silvia Cincera
  • Silvia Barella
  • Mattia Bellogini
  • Elena Bresciani
Technical Article---Peer-Reviewed

Abstract

A cupronickel heat exchanger failed after 10 years of service. The cooling heat exchanger was in service in a marine environment, with water flowing along shellside and natural gas along tubeside. Many tubes showed leakages during a regular maintenance test. A comprehensive failure analysis of the heat exchanger revealed the de-nickelification process on the external side of the damaged tubes (shellside). The de-nickelification originated from a large deposit of sea water scale, over tube lengths, which completely covered the area just outside the internal portion of the tubesheet, and occurred because of a failure of the regular cleaning operation. Stagnant water and possible hot spot formations on the tubes probably caused the phenomenon.

Keywords

De-nickelification Cupronickel Sea water Heat exchanger 

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Copyright information

© ASM International 2012

Authors and Affiliations

  • Silvia Cincera
    • 1
  • Silvia Barella
    • 2
  • Mattia Bellogini
    • 2
  • Elena Bresciani
    • 3
  1. 1.LF EngineeringBusseroItaly
  2. 2.Dipartimento di MeccanicaPolitecnico di MilanoMilanItaly
  3. 3.ExovaCremaItaly

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