A refinery’s cooling program looked healthy on paper. Cycles, chemistry, program residuals, product usage, and general corrosion rates all sat in the green — quarter after quarter. Yet the site was still replacing failed heat exchangers every year and overbuilding systems to survive the changeouts, at a cost of millions annually. Everyone had accepted it as “just the type of water here.” An independent review found the real story hiding behind the green dashboard, rebuilt the metrics and baseline chemistry, cut treatment cost by nearly a third, and eliminated the failures.
Everything appeared to be operating “in the green.” Cycles of concentration, water chemistry, chemical program targets, inventory and product usage, and general corrosion rates all read on target — yet the refinery kept failing heat exchangers.
The site was replacing failed exchangers every year and overengineering systems just to survive the changeouts. The losses ran into the millions annually, and the problem had been written off as “just the type of water here.”
The supplier reported everything as fine and routinely delivered value projects that helped the customer — while total cost kept climbing. No single number on the dashboard pointed to the real problem.
Ran a 3-year water-quality and operational review, cross-checking service reports against what the system chemistry should actually produce.
Performed an onsite system evaluation with operator and service-company interviews to reconstruct real operating practice — then re-ran the corrosion data properly.
Applied advanced saturation modeling and a full risk review, including seasonal and manganese variation in the supply water — then rebuilt the metrics and baseline chemistry working with both the supplier and the customer. No plant capital required.
The service company had never run a pitting analysis on the corrosion coupons. General corrosion read a healthy <3 mpy — but the first proper pitting analysis showed 127 mpy of localized attack, fast enough to drill through a heat-exchanger tube wall in under a year. That is what was failing the exchangers, and it never appeared on a single “green” report.
Copper corrosion had never been measured correctly either. Done properly, the admiralty brass showed 0.9 mpy with active dezincification. The cause: free chlorine held at 0.5–0.8 ppm was destroying most of the tolyltriazole, leaving the yellow metal largely unprotected. The phosphate program was all orthophosphate with no cathodic inhibitor, and seasonal manganese swings in the supply water were driving additional risk the program never accounted for.
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