Acid &loride corrosion of geothermal well casings, sigdficant levels oE chloride in steam and require treatment. preventing corrosion damage to the steam gathering system and production piping and power plant equipment has resulted in frequent curtailments Of power plants The corro$ion mitigation system has power plant, with surface piping corrosion rates typically below very in corrosion and the permanent shut-in of wells in certain areas of The mihear and turbine inlet below 0.05 ppm, Geysers. Techniques have been developed to mitigate these corrosion problems, allowing continued production of steam from high chloride wells with minimal impact on production and power generation facilities. The optimization of water and caustic steam scrubbing, steamfliquid separation and process fluid chemistry has led to effective and reliable corrosion mitigation systems currently in routine use at The Geysers. When properly operated, these systems can yield steam purities This paper outlines the design basis of acid-chloride corrosion mitigation systems currently in use at The Geysers. equal to or greater than those encountered in areas of The Developments in corrosion monitoring techniques, steam computer of the vapor-liq;id chemical sampling and analytical methodologies for trace impurities, and dynamin, and mechanical equipment ansiderations in computer modeling of the fluid chemistry has been instrumental maintaining high mass transfer and separation efficiencies. After ;he first nine months of operation, a' full turbine inspection was performed, including non-destructive testing and scale deposit analysis, which revealed no corrosion damage or evidence of acid-chloride or caustic deposits within the turbine. The operating results for this system encouraged the application of acid-chloride corrosion mitigation technology throughout The Geysers where corrosion is not a problem' Details of the process chemistry are discussed, including in the success of this technology.

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