For decades, engineers and integrity managers have relied on a single, critical standard to mitigate this risk: (formerly NACE MR0175). The 2021 revision of this standard represents the cutting edge of materials selection for sour service.
For engineers, integrity managers, and technical professionals working in petroleum refining and petrochemical industries, the standard known as is indispensable. It is one of the key documents for ensuring plant safety during critical periods.
While many search for a "free PDF," it is imperative to note that NACE SP0170 is a copyrighted document published by AMPP (formerly NACE). The 2018 version is the current standard. You cannot legally download it for free from distribution websites. Using stolen or unlicensed PDFs exposes your company to legal liability and risks using potentially outdated or corrupted information. nace sp0170 pdf 2021
Do not rely on a bootleg copy from a forum. Purchase the official PDF from AMPP, read it cover to cover, and integrate its requirements into your material selection and quality assurance workflows. In the sour service arena, the standard is not a suggestion—it is the law of physics, enforced by the potential for catastrophic failure.
Official digital PDF downloads and printed versions of this standard can be secured directly through authorized nodes like the Accuris Standards Store NACE SP0170-2018 Page or the ANSI Webstore . For decades, engineers and integrity managers have relied
: Sometimes, industry-specific associations or organizations provide access to relevant standards for their members.
In the oil and gas industry, equipment failure is not just an operational downtime issue—it is a safety and environmental catastrophe waiting to happen. When we talk about transporting and processing "sour" hydrocarbons (containing hydrogen sulfide, or H₂S), the stakes are exponentially higher. Hydrogen sulfide doesn't just poison personnel; it destroys metal through a vicious mechanism known as . It is one of the key documents for
This includes residual stresses introduced during fabrication and welding, as well as operational or structural loads. Corrosive Environment (PTA): Polythionic acids (
This is the most common method. The goal is to neutralize the acids that form on the metal surfaces. A mixture of soda ash ( Na2CO3cap N a sub 2 cap C cap O sub 3 ) and water is used, typically a soda ash solution (or lower, e.g., with a surfactant).