Nace Sp0170 - Pdf 2021

The standard NACE SP0170 (now managed by ) provides critical guidelines for protecting austenitic stainless steels and other austenitic alloys from Polythionic Acid Stress Corrosion Cracking (PTA SCC)

NACE (National Association of Corrosion Engineers) is a globally recognized organization that provides standards, guidelines, and best practices for corrosion prevention and control. One of its widely adopted standards is NACE SP0170, which provides guidelines for the design, fabrication, and inspection of equipment and components for corrosion prevention. This paper provides an overview of NACE SP0170 PDF 2021, highlighting its key aspects, updates, and implications for industries. nace sp0170 pdf 2021

The primary objective of SP0170 is to provide reliable mitigation methods to prevent Polythionic Acid Stress Corrosion Cracking (PTA SCC). This form of cracking occurs when sensitized austenitic stainless steels react with oxygen and water in the presence of sulfide corrosion products—common in refinery units like hydrocrackers and hydrotreaters—during shutdown periods. Core Mitigation Practices The standard NACE SP0170 (now managed by )

Benefits of Implementing NACE SP0170 PDF 2021 The primary objective of SP0170 is to provide

Technical Foundations and Modelling

SP0170 integrates corrosion science and probabilistic risk assessment. Important technical aspects include:

The standard provides essential mitigation methods for refinery equipment—such as desulfurizing, hydrocracking, and hydrotreating units—where the risk of PTA SCC is high. PTA SCC typically occurs when metal sulfides on equipment surfaces react with oxygen and moisture during a shutdown, forming polythionic acids that attack sensitized stainless steels.  Mitigation Methods Outlined in SP0170 

NACE SP0170-2021: "Impressed Current Cathodic Protection Systems for the Corrosion Protection of Steel Water Storage Tanks"