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Marta opened the attached spreadsheet. It listed the usual suspects: thickness readings, hardness tests, and a few spot checks for creep in the heater tubes. She scrolled past the rows of standard checks, then paused. Her eyes landed on a small header: High-Temperature Naphthenic Acid Corrosion (NAP) — marked "Not Required."

Marta grabbed her hard hat and walked to the heater. The unit was humming, but she remembered an internal corrosion probe reading from three months ago—a spike in iron content. The operations crew had blamed a "blip in the feed." api rp 571 pdf

Marta Vasquez, a senior reliability engineer at the Gulf Coast Refinery, had just finished her third cup of coffee when the email arrived. It was from the turnaround manager, Leo. Marta opened the attached spreadsheet