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Update – Anodic Protection of Continuous Digesters to Prevent Caustic and General Corrosion

Author(s): Ian Munro

Anodic protection systems have been installed in eight hydraulic continuous digesters and one impregnation vessel. Results indicate that corrosion and caustic cracking have been mitigated by the application of anodic protection. Operating characteristics, hardware improvements and digester inspection results are discussed. Potential and coupon monitoring systems using existing nozzles in digesters has proven to be an economical way to determine the susceptibility to corrosion and/ or caustic cracking.

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