Lay-up Protection for Boilers and HRSGs - American Public Power ...

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Failure Mechanisms Affected by Poor Lay-up • Oxygen Pitting • Corrosion Fatigue • Under Deposit Corrosion – Hydrogen Damage – Caustic Gouging 8
Oxygen Pitting Causes: • Downtime Oxygen • Dissolved oxygen on Startup • Corrosion Products Location: • Anywhere where water and oxygen coexist 9
Page 1 and 2: Lay-up Protection for Boilers and H
Page 3 and 4: Goals of Proper Lay-up • Minimize
Page 5 and 6: Lay-up is Critical for HRSG’s •
Page 7: Your Choice Passivation and Protect
Page 11 and 12: Normal Passivation Half Reactions F
Page 13 and 14: Oxygen Pitting Deposits create a lo
Page 15 and 16: Corrosion Fatigue Causes: • Oxyge
Page 17 and 18: Underdeposit Corrosion Causes: •
Page 19 and 20: Lay-up Considerations Quick return
Page 21 and 22: Corrosion Triangle 21
Page 23 and 24: Wet Lay-up — Excludes Oxygen 23
Page 25 and 26: Design Issues Affecting Layup • C
Page 27 and 28: Dry Lay-up Advantages • Only opti
Page 29 and 30: Steps for Dry Lay-up • Drain HRSG
Page 31 and 32: Dehumidified Air • Air must circu
Page 33 and 34: Vapor Phase Inhibitors • Used on
Page 35 and 36: VPI Preservation After 30 days Afte
Page 37 and 38: Wet Lay-up Disadvantages • Requir
Page 39 and 40: Nitrogen Cap Cap should be applied
Page 41 and 42: Nitrogen Addition Points Vent HP Tu
Page 43 and 44: Nitrogen Cap- Drums • Enters the
Page 45 and 46: Wet Chemical Lay-up • pH of water
Page 47 and 48: Wet Chemical Lay-up • Requires si
Page 49 and 50: Transitions Wet to Dry (Cold) • D
Page 51 and 52: Startup Chemistry Dry Lay-up Boiler
Page 53 and 54: Startup Chemistry Wet Lay-up (Nitro

Lay-up Protection for Boilers and HRSGs - American Public Power ...

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