Closed cooling loops are used to provide the required cooling to critical industrial equipment and processes that cannot tolerate the variability from open recirculating cooling towers. The key challenges in operating a closed loop are corrosion control and microbiological growth. A new non-toxic closed loop corrosion inhibitor program was developed that does not contain nitrite, heavy metal, P, B, or filming amine. This paper will present results from recent field trials using this new digitally-enabled, sustainable corrosion inhibitor program. The first field trial was conducted at a refinery in the Middle East that provided an opportunity to evaluate the new program in a hot loop (>90 °C) that experienced upsets and hydrocarbon ingress. A second field trial was conducted at a steel mill in Europe with a significantly more challenging makeup water that included moderate chloride and no hardness. Positive results from both field trials will be presented that will include coupon weight loss measurements, dissolved Fe concentration, and product actives monitoring

Subject
Makeup water, Water, Nitrites, Corrosion rate, Steel coupons, Iron, Corrosion loops, Corrosion inhibitors, Steel, Corrosion protection, Corrosion coupons, Biocides, Chlorides
Keywords:
Chemical treatment, corrosion inhibitors, corrosion management, water treatment
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2022
Association for Materials Protection and Performance (AMPP)
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