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The air headspace in steel circulating tanks can become rusty over time. Rust is a hard contaminant that can cause abrasion, promote oxidation and emulsify water. If there are no other options to control water ingression and rust, consider coating the area of the tank exposed to air and water condensation with a thin layer of grease that is compatible with the circulating oil. This should be done after a system drain and tank cleaning. The grease can be easily applied with a clean squeegee. (Michael Lofald, SAPPI Fine Paper)
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