Uncertainty Quantification: SP0170 recognizes measurement uncertainties and variability in soil and coating properties. It encourages conservative thresholds for prioritizing excavations when data quality is poor and advocates sensitivity analysis in ranking outputs.
Stay safe, stay compliant, and always refer to the most current standard.
Austenitic stainless steels (like Types 304 and 316) and other austenitic alloys used in high-temperature, high-pressure refinery service are often in a condition called "sensitized." This means their grain boundaries are depleted of chromium and are therefore vulnerable to attack. When PTA attacks these sensitized grain boundaries, it can initiate . nace sp0170 pdf 2021
Be cautious when searching for "nace sp0170 pdf 2021" on unknown websites, as many provide outdated or unauthorized versions of the document. Always ensure you are using the official AMPP standards store or recognized technical document vendors.
Keeping the internal relative humidity low enough to prevent liquid water from condensing on the metal surfaces, blocking the acid formation chain. Summary of Mitigation Methods Primary Mechanism Best Used For Key Consideration Nitrogen Blanket Excludes Oxygen ( O2cap O sub 2 Vessels not requiring internal inspection Requires strict confined space safety monitoring. Soda Ash Wash Neutralizes Acids ( H2SxO6cap H sub 2 cap S sub x cap O sub 6 Equipment opened for physical inspection/cleaning Must dry completely; chloride content must be minimized. Dehumidification Excludes Water ( H2Ocap H sub 2 cap O Piping and large vessels during prolonged turnarounds Requires continuous power and monitoring equipment. Critical Operational Best Practices Austenitic stainless steels (like Types 304 and 316)
: Latest papers (2025/2026) discussing how SP0170 is evolving to include chemical treatments. AI responses may include mistakes. Learn more
Yes. Following the merger of NACE International and SSPC to form AMPP in 2021, the standard may be rebranded as AMPP SP0170. However, the technical requirements remain consistent with the 2018 NACE version until a new revision is issued. Always ensure you are using the official AMPP
PTA is not typically present during normal refinery operations. Instead, it forms during shutdowns or turnarounds when the following sequence occurs:
If you would like to tailor your shutdown protocol, let me know:
The 2021 annexes provide "pre-qualified" materials. For example: