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Protection of Condensers in Power Plants with High Performance Polymeric Compounds

Protection of Condensers in Power Plants with High Performance Polymeric Compounds. Written By: Ricardo Chang. Presented By: Don Hilliard. Essential Parts of a Condenser. Types of Corrosion. Pitting Corrosion Crevice Corrosion. Types of Corrosion.

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Protection of Condensers in Power Plants with High Performance Polymeric Compounds

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  1. Protection of Condensers in Power Plants with High Performance Polymeric Compounds Written By: Ricardo Chang Presented By: Don Hilliard

  2. Essential Parts of a Condenser

  3. Types of Corrosion • Pitting Corrosion Crevice Corrosion

  4. Types of Corrosion • Intergranular Corrosion - Corrosion Fatigue • Galvanic Corrosion

  5. Types of Corrosion • Stress Crack Corrosion • Flow Induced Corrosion • Impingement Corrosion • Entrainment Corrosion • Cavitation

  6. Corrosion is… • “A gradual wearing away or alteration by a chemical or electromechanical oxidizing process”

  7. Ferrous Alloys Corrode • Water • Velocity • Acidity • Motion • Temperature • Bacteria / Salts / Aeration

  8. Basic Corrosion Cell • Anode • Cathode • Conductor between Anode and Cathode • Electrolyte (salt or acid solution)

  9. Galvanic Series • CORRODED END (ANODIC) Magnesium Lead Silver Solder Magnesium Alloys Tin Nickel (passive) Zinc Nickel (active) Inconel (passive) Aluminum 2S Inconel (active) Hastalloy C (passive) Cadmium Hastelloy C (active) Silver Aluminum 17ST Brass Graphite Steel or Iron Copper Titanium Cast Iron Bronzes Zirconium Carbon Steel Copper – nickel alloys Gold Stainless Steel Monel Platinum PROTECTED - END (CATHODIC)

  10. Galvanic Corrosion • The # 1 Problem in Condensers • Also • Pitting • Crevis

  11. Solutions to Prevent Corrosion • Cathodic Protection • Specialty Alloys • Barrier Coatings

  12. Belzona 1321

  13. Belzona 1341

  14. Belzona 1391

  15. Belzona 1591

  16. Belzona 5811

  17. Some Considerations • Surface must be cleaned with an angular abrasive to obtain a near white metal finish with a 3-mil surface profile. • Surface must be dry and free from contaminants. • Often several coats must be applied. • Cure times may be excessive. • Finished surface must be free from pin holes or holidays (detection is required). • Low heat transfer coefficients.

  18. In Conclusion: • Equipment in wet operating conditions will corrode!!!!!

  19. Barrier Coatings can Provide: • Low Cost • Long Lasting Solution To the overall problem of corrosion

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