NACE SP0170-2018 is the current reaffirmed version available from AMPP .
NACE SP0170 PDF: Protecting Refinery Equipment from Polythionic Acid Stress Corrosion Cracking
The standard outlines several acceptable protection methodologies depending on whether the equipment needs to be opened for internal inspection/maintenance or kept closed during the turnaround. 1. Exclusion of Oxygen (Nitrogen Purging)
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NACE SP0170 outlines standard practices to prevent the formation of polythionic acids or protect sensitized alloys from coming into contact with them when equipment is out of service. The standard applies to:
What is Polythionic Acid Stress Corrosion Cracking (PTA-SCC)?
Based on field experience, here are the top five implementation tips for using the effectively:
The specific standard SP0170 likely deals with a detailed methodology or protocol for a particular aspect of corrosion management. As an example, standards might cover:
This comprehensive guide examines the technical foundations of PTA-SCC, the critical role of the NACE SP0170 standard, and industry best practices for protecting valuable metallurgical assets during downtime.
This stress can be residual (from welding, forming, or fabrication) or operational (from thermal expansion and mechanical loads).
NACE SP0170 (2018 edition), titled "Protection of Austenitic Stainless Steels and Other Austenitic Alloys from Polythionic Acid Stress Corrosion Cracking During a Shutdown of Refinery Equipment," is a copyrighted standard available through AMPP. The document provides crucial mitigation methods for refinery equipment, focusing on preventing Polythionic Acid (PTA) Stress Corrosion Cracking (SCC) during shutdowns through techniques like alkaline washing. Purchase the standard at the AMPP Standards Store
The primary objective of the document is to prevent the simultaneous occurrence of the three factors listed above, specifically targeting the elimination of oxygen and liquid water from interacting with sulfide scales on sensitized metallurgy. Core Mitigation Strategies in NACE SP0170
The NACE SP0170 PDF is an indispensable tool for refinery engineers, inspectors, and fabricators. It provides a proven, safe method to prevent catastrophic weld corrosion in high-temperature sulfur service. However, resist the temptation of free, shady downloads. Purchase the official standard from AMPP to ensure you have the latest, legally compliant, and complete information.
To successfully deploy NACE SP0170 protocols during a refinery turnaround, asset integrity managers should integrate the following steps into their execution plans: Action Item NACE SP0170 Alignment
Refinery heaters, heat exchangers, piping, and pressure vessels. Standard austenitic stainless steels (300 series).
If equipment must be opened to the atmosphere for inspection, cleaning, or repairs, excluding oxygen is impossible. In these scenarios, NACE SP0170 mandates neutralizing the environment using an alkaline solution. A solution of sodium carbonate (soda ash, Na2CO3cap N a sub 2 cap C cap O sub 3
