Title: How to eliminate standby corrosion in HRSGs and steam turbines

You can just hear someone on the plant staff saying to an HRSG inspector regarding unexpected waterside corrosion damage, “But we didn’t do anything to cause this condition.” Precisely the point: It was important to do something. That thought prompted Thermal Chemistry Ltd’s David Addison to give the editors a short course on shutdown and layup practices designed to assure a flexible return to service for combined-cycle plants. He asked, “What is HRSG standby corrosion? Not getting a response (what do editors know, anyway), Addison answered his own question: Standby corrosion is the unwanted formation of non-protective iron oxides from Rankine Cycle materials—bluntly, rust. It occurs under stagnant, low-pH, and oxygen-saturated water and when high-humidity (more than 30% RH) conditions exist. The condition is often ignored. Plants in reserve, two-shifting, and frequent start/stop service are most prone to standby corrosion damage (Fig 1). Addison said there are several risks associated with standby corrosion, including these:

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   Person Information
   Application Sequencing
Company  Product  Process  Other  Subjects  Event  Event  Date  Location  Publication  Publication  Date Text  Descriptor

  • Corrosion Inhibitor

  • Heat Recovery Steam Generator

  • Steam Turbine

  • Corrosion

 

 

 

 

  • CCJ

 

  • 9/9/2013

 

  • Article