The solution is circulated through the equipment or used to thoroughly soak components. It must leave a protective alkaline film on the steel surfaces as they dry. 3. Dehumidification (Dry Air Blanketing)
What is Polythionic Acid Stress Corrosion Cracking (PTA-SCC)?
| Feature | NACE SP0170 | NACE MR0175/ISO 15156 | | :--- | :--- | :--- | | | Shutdown/Startup protection | Materials selection for sour service (H2S) | | Primary Threat | Polythionic acid SCC | Sulfide stress cracking (SSC) and HIC | | Applicability | During maintenance events | During normal operation | | Target Materials | Austenitic stainless steels | Carbon steels, low alloys, CRAs | | Key Measure | Neutralization washing | Hardness control, alloy composition |
This standard was first published in 1970 as a recommended practice (RP), designated as . It has since been updated several times, evolving to its current form as a standard practice (SP) numbered SP0170. Today, the standard is owned and maintained by Task Group 173 of the Association for Materials Protection and Performance (AMPP) . nace sp0170 pdf
To get the most out of NACE SP0170 PDF, industries should follow best practices for implementation. Some of these best practices include:
In the high-stakes world of oil and gas processing, corrosion is the silent enemy. While much attention is given to the corrosion of the pipe wall itself, a more vulnerable area often determines the lifespan of a facility: the and the underlying steel.
user wants a long article about "nace sp0170 pdf". This is likely about the NACE SP0170 standard, which is the "Standard Practice for Protection of Austenitic Stainless Steels and Other Austenitic Alloys from Polythionic Acid Stress Corrosion Cracking During Shutdown and Startup". I need to provide a comprehensive article covering what the standard is, its importance, key provisions, how to obtain the PDF, and related considerations. The solution is circulated through the equipment or
By obtaining the legitimate PDF from AMPP, reading it thoroughly, and embedding its requirements into your turnaround procedures, you will:
Because nitrogen is an asphyxiant, stringent confined-space entry rules apply to adjacent systems. 2. Alkaline Chemical Neutralization
If liquid washing is impractical, keeping the internal environment completely dry is an alternative. By introducing dehumidified air with a relative humidity (RH) below 20%, moisture is eliminated from the equation, preventing the chemical reaction that yields polythionic acid. Evolving Material Selection to Complement SP0170 Today, the standard is owned and maintained by
Searching for is your first step toward ensuring the integrity of your refinery, chemical plant, or gas processing facility. This standard is not a recommendation; in many jurisdictions and corporate policies, it is a mandatory practice.
By implementing the practices found in the , refiners can effectively protect their high-value equipment from sudden failure during maintenance shutdowns. A summary of specific alkaline solutions used in industry. The difference between SP0170 and other NACE standards. Guidelines on monitoring for sulfide scales. Let me know how you'd like to proceed. Share public link
What specific (e.g., 304, 347) is your equipment made of?
Provides a preview of the standard which includes the table of contents and foreword.
A comparison between the susceptibility of stainless steels under SP0170 guidelines.