The standard covers both new fabrication and repair welds, addressing various cracking mechanisms including and Alkaline Stress Corrosion Cracking (ASCC) . Key Technical Requirements
First, a critical nomenclature update. NACE International (now part of AMPP: The Association for Materials Protection and Performance) transitioned from “RP” (Recommended Practice) to “SP” (Standard Practice) in the early 2010s. Therefore, the current official designation is (or the most recent revision).
, Methods and Controls to Prevent In-Service Environmental Cracking of Carbon Steel Weldments in Corrosive Petroleum Refining Environments , is the industry standard for minimizing the risk of cracking in welded P-No. 1 carbon steels. nace rp0472 pdf new
Controlled primarily through hardness limits. The standard typically mandates a maximum weldment hardness of 200 HBW (Brinell) to prevent cracking in wet H2Scap H sub 2 cap S environments.
: Originally prepared in 1972 to address a spike in SSC failures in the late 1960s. The standard covers both new fabrication and repair
: It maintains a maximum weld deposit hardness of 200 Brinell (HBW) for P-No. 1 steels, which is more stringent than the 22 HRC limit found in other standards like MR0175 to account for production testing variations.
Primarily used for carbon steel equipment and piping in refining environments, such as sour water, amines, or caustic service. Key Aspects of NACE SP0472-2020 Therefore, the current official designation is (or the
For materials engineers, welding inspectors, and asset integrity managers, downloading the official NACE SP0472 PDF via the ANSI Webstore provides the precise technical criteria needed to prevent stress corrosion cracking and hydrogen-induced failures in downstream processing units. Overview and Scope of NACE SP0472
Because this is a copyrighted industry standard, you cannot legally download a "new" or free PDF version from unauthorized sources. You must obtain it through the official publisher.