NACE RP0472 is a recommended practice from NACE International (now part of AMPP) that provides guidance on corrosion control for pipelines and related infrastructure. Below is a concise, practical summary and actionable guidance for engineers, corrosion technicians, and asset owners seeking to understand or implement the document's recommendations.
In 2023, NACE International (National Association of Corrosion Engineers) merged with SSPC to form AMPP (The Association for Materials Protection and Performance). As part of this transition, older NACE standards were re-designated.
To understand the report, one must understand the failure modes the standard attempts to mitigate:
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. nace rp0472 pdf new
Summary: If you are looking for the latest requirements to prevent environmental cracking in carbon steel weldments, do not use NACE RP0472. You must use AMPP SP0472-2023.
The standard formerly known as NACE RP0472 has been updated and redesignated as NACE SP0472. The current active version is NACE SP0472-2020, which was reaffirmed in August 2020. Overview of NACE SP0472
This standard provides critical guidelines for the petroleum refining industry to prevent in-service environmental cracking of carbon steel weldments. It is widely used by refiners, equipment manufacturers, and construction contractors to ensure the safe operation of pressure vessels, piping, and heat exchangers. Key Technical Aspects NACE RP0472 is a recommended practice from NACE
The standard formerly known as NACE RP0472 is now officially NACE SP0472 . As of April 2026, the current active version is NACE SP0472-2020 (Reaffirmed) Current Standard Overview Official Name
: Methods and Controls to Prevent In-Service Environmental Cracking of Carbon Steel Weldments in Corrosive Petroleum Refining Environments. Active Edition NACE SP0472-2020 Organization : Maintained by
(the merged organization of NACE International and SSPC) under Task Group 326. Key Technical Scope Summary: If you are looking for the latest
This standard provides requirements for mitigating environmental cracking in carbon steel weldments within refinery environments.
AMPP - The Association for Materials Protection and Performance Application
: Covers pressure vessels, heat exchangers, and piping components. Requirements
: Focuses on material hardness, welding procedures, and PWHT to prevent cracking. Hardness Limit
: Generally specifies a maximum weld deposit hardness of 200 HB.