Manage heat input strictly during the welding process to control the cooling rate of the HAZ.
Key requirements covered in the standard include:
Refinery environments often expose processing equipment to aggressive mechanisms like Sulfide Stress Cracking (SSC). SSC occurs when tensile stress, a susceptible microstructure (high hardness), and a corrosive environment containing wet H2Scap H sub 2 cap S interact simultaneously. Controlling weldment hardness serves several key functions: nace rp0472 pdf
: The primary goal of this recommended practice is to offer a comprehensive approach to the planning, execution, and reporting of in-line inspections of buried pipelines. It aims to enhance the detection, characterization, and reporting of anomalies that could potentially lead to pipeline failures.
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Correct application of RP0472 has a direct impact on safety and economics. Documented weld failures in pressure vessels, heat exchangers, tanks, and piping have been caused by environmental cracking. By following the guidelines, refineries can dramatically reduce the risk of such catastrophic failures, preventing dangerous leaks, fires, and explosions, while avoiding costly downtime and repairs.
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NACE RP0472, titled "Methods and Controls to Prevent In-Service Environmental Cracking of Carbon Steel Weldments in Corrosive Petroleum Refining Environments," establishes guidelines for the design, fabrication, and maintenance of carbon steel equipment.