When purchasing from Accuris (formerly IHS Markit), PDF files can be downloaded from the "My Downloads" page in your account. Additional options include:
). It is highly aggressive and can cause catastrophic, brittle failure of vessel walls, piping, and welds without prior warning or visible deformation. Stress Corrosion Cracking (SCC)
Utilize robust preheating schedules during welding to slow down the cooling rate, preventing martensite formation.
Legal PDF copies can be purchased through licensed distributors such as IHS Markit, Techstreet, or ANSI.
Dedicated to upstream oil and gas production and drilling environments. It accounts for reservoir pressures and complex downhole chemical matrices. Why Accessing the Official PDF Matters nace rp0472 pdf
The standard is broad in its application, covering almost all pressure-containing equipment in a refinery. This includes:
The standard dictates that every welding procedure specification (WPS) for sour service must be qualified using hardness traverses. You cannot just "guess" the hardness; you must measure it via microhardness testing (HV10).
NACE RP0472 is a standard practice published by the National Association of Corrosion Engineers (NACE) that provides guidelines for the "Design, Fabrication, and Surface Finish of Metallic Materials to Resist Corrosion in Refinery Environments".
Even if a welding procedure is qualified, field variables can introduce defects. Therefore, NACE RP0472 requires real-world production hardness testing on finished vessels and piping. When purchasing from Accuris (formerly IHS Markit), PDF
Where carbon steel is susceptible to Amine Stress Corrosion Cracking (ASCC). Sour Water Strippers: High concentrations of H2Scap H sub 2 cap S
The superseded date is . A superseded standard is one that has been fully replaced by another standard, typically a new edition of the same document.
Cross-sections are etched to visually inspect the HAZ and weld passes before hardness indents are made. 3. Post-Weld Heat Treatment (PWHT)
The core objective of NACE RP0472 is enforcing metallurgical limits on the weld metal and the Heat-Affected Zone (HAZ). 1. Hardness Limitations It accounts for reservoir pressures and complex downhole
Restrict the carbon equivalent (CE) of purchased carbon steels to minimize inherent hardenability.
To combat this, the National Association of Corrosion Engineers (NACE)—now part of AMPP (The Association for Materials Protection and Performance)—developed . This standard provides comprehensive guidelines for controlling weld hardness in carbon steel equipment to prevent cracking.
The standard specifically addresses and stress-oriented hydrogen-induced cracking (SOHIC) . These are nasty forms of cracking that occur when hard weldments are exposed to wet H₂S (sour service) environments.
) environments. To combat this, the National Association of Corrosion Engineers (now part of AMPP) established , a standard practice focusing on controlling weld hardness to mitigate cracking risks.