The selection of materials of construction for Wet Electrostatic Precipitators (wet ESPs, or WESPs) is a challenging problem. With metals, over specifying the alloy can make the project non-economical, while selecting an insufficient alloy may threaten the longevity of the equipment. To further complicate matters, vendors of wet ESPs cannot be expected to offer long-term warranties with respect to corrosion, but this is exactly what end users want – reasonable assurance that the installed equipment will hold up to the application environment.
Plastic materials can be a solution to this problem but are certainly not a perfect solution. Plastics are subject to damage due to excessive temperature. They are also subject to arc damage from high voltage sparking. Finally, even with plastic designs the high voltage electrodes must be metal, so the same challenge of alloy selection is present…
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