The document outlines the procedure for acid cleaning a boiler, which involves two main steps: [1] Acid cleaning to remove deposits using citric acid and inhibitors, monitoring pH and other parameters; [2] Flushing and passivation to avoid corrosion and passivate metal surfaces using ammonia and sodium nitrite. It also describes an optional wet lay up procedure to store the boiler by flooding superheaters with treated water and maintaining chemical levels.
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