In the refining and petrochemical industries, the reliability of equipment during shutdowns is critical. One of the most severe corrosion threats during these periods is . NACE SP0170 (now commonly referred to by its latest revisions, including updates up to 2021) provides the industry-standard practices for mitigating this threat.
The system must remain pressurized under nitrogen for the entire shutdown. This strategy is perfect for units that do not require internal inspections or catalyst changes. 2. Alkaline Chemical Washing (Neutralization) nace sp0170 pdf 2021
The 2018/2021 approach encourages a risk analysis to determine the appropriate method (wash vs. dry air) based on equipment history, metallurgy, and severity of exposure. The system must remain pressurized under nitrogen for
: Covers the entire shutdown process, including downtime and the periods immediately preceding and following it (start-up). Target Materials : Focuses on common refinery alloys like UNS S30400 (304 SS) S31600 (316 SS) , and stabilized grades like If you’d like
: Using dry nitrogen to exclude oxygen and moisture from the equipment, preventing the formation of polythionic acid. Alkaline Washing
For engineers, integrity managers, and technical professionals working in petroleum refining and petrochemical industries, the standard known as is indispensable. It is one of the key documents for ensuring plant safety during critical periods.
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