Nace Sp0170 Pdf 2021 !!better!! Jun 2026

Compared to previous versions (2003, 2012), the 2021 revision includes:

As of 2021, NACE International merged with SSPC to form AMPP. The standard is available for purchase and download through: (formerly NACE Store) ANSI Webstore GlobalSpec/Accuris

The standard outlines several strategies to prevent the formation of polythionic acid or to neutralize it before damage occurs: NACE SP0170-2018 nace sp0170 pdf 2021

) is pumped into the system to maintain a slight positive pressure.

This includes residual stresses introduced during fabrication and welding, as well as operational or structural loads. Corrosive Environment (PTA): Polythionic acids ( Compared to previous versions (2003, 2012), the 2021

) reacts with iron in the equipment walls to form iron sulfide ( FeScap F e cap S ) scale. During a shutdown, if ambient oxygen ( O2cap O sub 2 ) and water ( H2Ocap H sub 2 cap O

The standard, titled "Protection of Austenitic Stainless Steels and Other Austenitic Alloys from Polythionic Acid Stress Corrosion Cracking During a Shutdown of Refinery Equipment," is a critical standard practice used by the petroleum refining industry. While users often search for a "2021" edition, it is important to note that as of May 2026, the NACE SP0170-2018 edition remains the most current and active version of the standard. In 2021, NACE International merged with the Society for Protective Coatings (SSPC) to form AMPP (Association for Materials Protection and Performance), which now maintains the standard under Task Group 173. Overview of NACE SP0170 Corrosive Environment (PTA): Polythionic acids ( ) reacts

During normal refinery operations (particularly in hydroprocessing, desulfurization, and catalytic cracking units), hydrogen sulfide (