: Newer methods that stabilize the scale, potentially replacing traditional soda-ash washes in complex risk-based inspection programs. Key References for your PDF Search
The standard applies to equipment susceptible to PTA SCC, including: Desulfurizing units Hydrocracking units Hydrotreating units Fluid Catalytic Cracking Units (FCCU) Crude and lube distillation units
). These acids, in conjunction with the sensitized (sensitization occurs due to Chromium Carbide precipitation) microstructure of the stainless steel, lead to rapid intergranular cracking, often causing failure upon restart. Key Requirements of NACE SP0170-2021
The NACE SP0170 standard, also known as "Standard Practice for Corrosion Prevention of Carbon Steel Pipelines by Coatings and Cathodic Protection," is a widely adopted industry guideline for ensuring the integrity and longevity of carbon steel pipelines. Published in 2021, the latest version of this standard provides critical recommendations for corrosion prevention and control in pipeline systems. In this article, we will explore the key aspects of NACE SP0170 PDF 2021, its significance, and best practices for corrosion prevention in pipelines. nace sp0170 pdf 2021
The latest version of the standard for protecting equipment during refinery shutdowns is . While some search for a "2021" version, the 2018 edition remains the current active standard practice.
: Maintaining a dry environment with air to ensure no liquid water is present to react with sulfur species. Material Selection
NACE SP0170 is a critical standard practice used in the petroleum refining industry to prevent Polythionic Acid Stress Corrosion Cracking (PTA SCC) : Newer methods that stabilize the scale, potentially
To protect stainless steel equipment that has been sensitized (sensitization occurs when exposed to temperatures between , common in hydrotreating/hydrocracking) from SCC.
Industry professionals following SP0170 typically employ one or more of the following primary protection methods: Nitrogen Purging
: These acids are relentless. They seek out "sensitized" areas—grain boundaries in the metal weakened by heat—and cause rapid, catastrophic cracking. A pipe that looked perfect yesterday can literally shatter today. Key Requirements of NACE SP0170-2021 The NACE SP0170
Updated to a "Standard Practice" designation to align with modern metallurgical definitions.
) is often added to the wash to minimize the risk of chloride stress corrosion cracking, which can be triggered by standard wash water.
NACE SP0170 is an industry standard practice officially titled