The danger begins the moment the unit is turned off for maintenance. This is where steps in.
NACE SP0170 has a long history of updates to reflect evolving refinery practices: Polythionic Acid Stress Corrosion Cracking (PASCC) nace sp0170 pdf 2021
, specifically for in-situ testing and monitoring of feedstock impurities like free fatty acids and water, which significantly increase localized corrosion risks. step-by-step checklist for your next turnaround based on these NACE guidelines? The danger begins the moment the unit is
Displacing air with dry nitrogen to keep oxygen out so the acid can never form. nace sp0170 pdf 2021
The standard you're likely referring to is related to the mitigation of stray-current corrosion.