Nace Sp0170 Pdf 2021 Instant

For projects outside North America, use ISO 15156. For any project in the U.S. (especially OCS and onshore sour gas), use NACE SP0170 PDF 2021 as the governing document.

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This is a common field procedure where internal surfaces are washed with an alkaline solution to neutralize any acids that might form. The standard notes that field experience has demonstrated austenitic stainless steels are effectively protected when alkaline wash solutions are properly applied to all wetted surfaces. nace sp0170 pdf 2021

The primary goal is to prevent the rapid, intergranular cracking of "sensitized" stainless steels (those exposed to high temperatures that cause chromium depletion at grain boundaries). Timeline Protection

This article provides a comprehensive overview of the standard, its significance, and how to implement its requirements. What is Polythionic Acid SCC? For projects outside North America, use ISO 15156

Massive internal surface areas with complex stainless steel fractionation trays.

To neutralize the polythionic acids formed on the surface of the metal. Here’s a useful, actionable piece of content about

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

The new edition provides updated charts for maximum H₂S partial pressure versus pH. Carbon steels that passed in 2015 may now be disqualified under the 2021 thresholds, especially in low-pH (acidic) environments.

To eliminate moisture and oxygen, thus preventing the formation of polythionic acids. 2. Alkaline Washing (Soda Ash Treatment)