She pulled up the crude assay for the next two years. TAN: 1.2. Temperature at the heater outlet: 620°F.
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. She pulled up the crude assay for the next two years
She frowned. The unit processed a heavier, more acidic crude slate than last year. She grabbed the tattered, coffee-stained copy of from her shelf—the "bible" of damage mechanisms. It fell open to Section 5.1.10: Naphthenic Acid Corrosion . Marta grabbed her hard hat and walked to the heater
She re-read the classic line: "High temperature naphthenic acid corrosion (NAP) is characterized by sharp, knife-edged pits or grooves with a scalloped appearance, often in high-velocity areas."
She taped a note above her desk: "The damage mechanism doesn't care about your schedule." Would you like a version focused on a different damage mechanism from API RP 571, such as High-Temperature Hydrogen Attack (HTHA) or Chloride Stress Corrosion Cracking (CSCC) ?