: Neutralizes any PTA that may form. The standard emphasizes that solutions must be properly applied to all surfaces and warns of potential effects on catalysts.
The standard (last officially updated in 2018 but widely applied through 2021) tells a "deep story" not of people, but of the silent, invisible war against Polythionic Acid Stress Corrosion Cracking (PTASCC) . nace sp0170 pdf 2021
To prevent this, the standard outlines four primary strategies: : Neutralizes any PTA that may form
The most direct way to stop the acid from forming is to prevent oxygen from ever touching the internal metal surfaces. To prevent this, the standard outlines four primary
At its core, this technical document is a survival guide for massive oil refinery components—like hydrotreating reactors and piping—during their most vulnerable moments: . The Story of a Shutdown
However, as of 2025, remains the active, current standard. A 2024 revision has not been released; typical cycles are 5–8 years.
Indirect Inspection