Since NACE RP0472 is a copyrighted standard, it must be purchased from official distributors. Here are your options for obtaining the most current and legitimate PDF.
The official, active standard is . It can be purchased directly from the standards bodies or their authorized resellers.
To achieve its goal, the standard focuses on controlling three key variables:
Page 1. NACE SP0472-2020. Item No. SP0472-2020. Reaffirmed 2020-08-17. Revised 2015-03-14. Revised 2010-03-13. Revised 2008-11-07. gasplus.ir Nace RP0472 - 2005 | PDF - Scribd nace rp0472 pdf new
: A free preview of the 2020 edition covering the scope and general requirements. AMPP (NACE) Product Page
: Establish standard practices for producing weldments in P-No. 1 carbon steels that are resistant to environmental cracking (such as Sulfide Stress Cracking, or SSC) in corrosive refining environments.
Residual stresses from welding are a major driver of cracking. PWHT is often required to reduce these stresses to safe levels, particularly in thicker materials or more severe service environments. H2Scap H sub 2 cap S Cracking Mechanisms Since NACE RP0472 is a copyrighted standard, it
: Predominantly used for services containing wet hydrogen sulfide (H₂S) , often referred to as "sour service". Key Controls and Requirements
The transition from "RP" (Recommended Practice) to "SP" (Standard Practice) reflects a reorganization of the document into a specification-style format. The most recent active edition was reaffirmed in . Core Objectives and Scope
┌──────────────────────────────────────────┐ │ NACE SP0472 Environments │ └────────────────────┬─────────────────────┘ │ ┌───────────────────────┴───────────────────────┐ ▼ ▼ ┌───────────────────────────────────┐ ┌───────────────────────────────────┐ │ Hydrogen Charging Damage │ │ Alkaline Stress Corrosion (ASCC) │ ├───────────────────────────────────┤ ├───────────────────────────────────┤ │ • Sulfide Stress Cracking (SSC) │ │ • Caustic Cracking │ │ • Hydrogen Stress Cracking (HSC) │ │ • Amine Cracking │ │ • Stress-Oriented Hydrogen-Induced│ │ • Alkaline Carbonate Cracking │ │ Cracking (SOHIC) │ │ │ ├───────────────────────────────────┤ ├───────────────────────────────────┤ │ Mitigation: Hardness Control │ │ Mitigation: Residual Stress Relief│ │ Target: Max 200 HBW │ │ Target: Full Thermal PWHT │ └───────────────────────────────────┘ └───────────────────────────────────┘ It can be purchased directly from the standards
The standard formerly designated as has been officially updated and renamed to NACE SP0472 . This critical technical document outlines the required methods and metallurgical controls necessary to prevent environmental cracking in carbon steel weldments operating within corrosive petroleum refining environments.
[ Weldment Zone ] ___________________________________________________________ | Base Metal | Heat-Affected Zone | Weld Deposit | | (P-No. 1) | (HAZ) | | | | | Hardness Cap: | | | Controlled via Heat | 200 HBW | | | Input & Cooling Times | (Max Limit) | ___________________________________________________________ Hardness Testing and Caps
Testing frequency is determined by the severity of the service and the criticality of the equipment. Why You Need the "New" PDF Version
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The shift from "RP" to "SP" was part of a NACE International global standards initiative to more accurately classify its publications. A "Standard Practice" (SP) is a more definitive document containing requirements, whereas a "Recommended Practice" (RP) was historically more advisory. This change underscores the standard's authority as a mandatory reference for in-service performance.