Do you know any tips for removing rust in dissolved air flotation (DAF) equipment?

DAF equipment is commonly made of either carbon steel or stainless steel. While stainless steel is often preferred in the food industry, the cost factor often leads to the predominant use of carbon steel. However, after several years of usage, carbon steel equipment may develop rust, ranging from minor corrosion to severe degradation, potentially compromising its operational efficiency. In such cases, it becomes imperative to employ appropriate rust removal methods.

Surface rust removal for carbon steel in DAF machines typically involves manual grinding using a wire brush or employing sandblasting techniques, ensuring a rust removal grade of Sa2.5.

Interior coating of the DAF machine is crucial. For general water quality, it is recommended to apply two coats of epoxy coal asphalt. In instances of complex water quality, a more comprehensive approach includes two coats of epoxy rich zinc primer, followed by two coats of epoxy rich zinc intermediate paint, and a final coat of epoxy rich zinc topcoat. Alternatively, employing a lining method may be considered.

As for the exterior coating of the DAF machine, the standard practice involves applying two coats of alcohol-acid rust-proof paint primer, followed by one coat of alcohol-acid rust-proof paint topcoat. In cases with specific requirements, it is advisable to administer two coats of epoxy rich zinc primer and one coat of epoxy rich zinc topcoat.

By implementing these recommended rust removal techniques, the DAF equipment’s aesthetic appeal can be preserved, while simultaneously optimizing its operational efficiency and extending its service life.