The NACE standard formerly known as has been updated and renamed to NACE SP0472 , with the most current major revision being the 2020 edition . A standout "good feature" in recent updates is the introduction of mandatory hardness survey layouts for new welding procedure qualifications. Key Features of NACE SP0472
Many websites claiming to offer a "free PDF" provide outdated (e.g., 2005) versions of the standard. Always verify you are using the 2020 version to ensure your welding procedures are legally compliant.
The standard dictates specific locations for hardness tests on cross-sections of the weld, including base metal, HAZ, and weld metal.
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The standard focuses on two primary categories of in-service refinery cracking: 1. Cracking From Hydrogen Charging
: Focuses on material hardness, welding procedures, and PWHT to prevent cracking. Hardness Limit
Look for NACE SP0472-2020 or the most recent updates on the AMPP Standards Store. The NACE standard formerly known as has been
NACE SP0472 (formerly RP0472) serves as a critical guideline for the oil, gas, and petrochemical industries. Its primary objective is to prevent in-service environmental cracking—specifically and Stress Corrosion Cracking (SCC) —in carbon steel piping systems.
: Focused strictly on controlling the hardness of the weld deposit to prevent cracking.
Related search suggestions (terms you can use for further research): Always verify you are using the 2020 version
The standard was originally introduced in 1972 as a Recommended Practice () by NACE International (now merged into AMPP, the Association for Materials Protection and Performance ). Over the years, NACE updated its nomenclature system, transitioning "RP" (Recommended Practice) documents to "SP" (Standard Practice).
You can find official copies or previews of the 2020 version through these platforms: AMPP Store : The official source for NACE SP0472-2020 ANSI Webstore : Provides a preview PDF showing the table of contents and foreword. Accuris (formerly IHS Markit) : Offers the current standard for purchase. Accuris Standards Store Do you need specific hardness requirements material exemptions for a particular project? NACE SP0472-2020 - Accuris Standards Store
The 2020 revision (reaffirmed from 2015) refined the guidelines based on years of field experience and laboratory research.