NEWS August 19 - HRSG Forum Major Cycle Chemistry Aspects for HRS copy

HRSG Forum: Major Cycle Chemistry Aspects for HRSGs

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‘SI is proud to have SI Expert and Senior Associate, Dr. Barry Dooley presenting at the HRSG Forum on August 19that 11 am (EST).  

TOPIC:  Introduction to the Key Cycle Chemistry Features for HRSG Reliability

HRSG ForumThe basic rules for providing optimum cycle chemistry control for HRSGs will be outlined. The latest statistics from over 100 HRSG plants worldwide will show how the lack of basic cycle chemistry controls leads to the major failure/damage mechanisms. The following two presentations will provide information on what is acceptable for the two top situations involving monitoring iron and continuous instrumentation.

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News & View, Volume 45 | The Importance of HRSG HP Evaporator Tube Internal Deposit Evaluation

News & Views, Volume 45 | The Importance of HRSG HP Evaporator Tube Internal Deposit Evaluation

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By:  Barry Dooley

News & View, Volume 45 | The Importance of HRSG HP Evaporator Tube Internal Deposit EvaluationEvaluation of High Pressure (HP) Evaporator Tube Deposits is important for several reasons:

  • Determining if flow-accelerated corrosion (FAC) might be occurring in the lower pressure circuits.
  • Regular evaluations can provide information on the internal deposit deposition rate, which is information necessary to help prevent under-deposit corrosion damage mechanisms.
  • Provides information necessary to develop an optimized cycle chemistry for HRSGs.
  • Can help determine if the HRSG needs to be chemically cleaned.

The leading heat recovery steam generator (HRSG) tube failure mechanisms are FAC, thermal and corrosion fatigue, and under-deposit corrosion (UDC) and pitting. The corrosion products released by the FAC mechanism are transported from the affected area (typically the feedwater or lower pressure systems) and can eventually reach the HP evaporator tubing, so understanding the deposition in the HP evaporator is an important step in determining if FAC might be occurring. Deposition on the inside of HP evaporator tubing is also a precursor to any of the under-deposit corrosion HRSG tube failure mechanisms.

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