The system is purged and pressurized with dry nitrogen gas ( N2cap N sub 2
(formerly RP0170) is the current standard for the Protection of Austenitic Stainless Steels and Other Austenitic Alloys from Polythionic Acid Stress Corrosion Cracking During a Shutdown of Refinery Units .
Because NACE standards are now managed under (Association for Materials Protection and Performance), the 2021 version is a protected, copyrighted document. nace sp0170 pdf 2021
This comprehensive technical guide details the mechanisms behind polythionic acid stress corrosion cracking and explores the primary engineering strategies mandated by the standard to ensure asset integrity during turnarounds.
To provide proven methods for protecting refinery equipment made of austenitic stainless steel from cracking caused by polythionic acid during a shutdown. The system is purged and pressurized with dry
Be cautious when searching for "nace sp0170 pdf 2021" on unknown websites, as many provide outdated or unauthorized versions of the document.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.
): Atmospheric oxygen entering the system when equipment is opened for inspection or catalyst dumping. To provide proven methods for protecting refinery equipment
). This causes chromium carbides to precipitate at the grain boundaries, depleting adjacent areas of localized corrosion resistance.
The following guide details the technical specifications, mechanics of PTA SCC, and mandatory mitigation procedures outlined in the NACE SP0170 PDF standard . What is NACE SP0170?
For PTA SCC to occur, three specific factors must align simultaneously:
The National Association of Corrosion Engineers (NACE) developed the SP0170 standard to provide a comprehensive framework for corrosion prevention in carbon steel pipelines. The standard outlines the requirements for coatings and cathodic protection (CP) systems, which are essential for mitigating corrosion and ensuring the safe and reliable operation of pipelines.