Materials and Fabrication Requirements for Carbon Steel Pressure Vessels in Petroleum Refining Wet H2S Environments

This AMPP standard defines standard practices for new carbon steel (CS) pressure vessels to be used in petroleum refining wet hydrogen sulfide (H₂S)-containing environments, with the recommended steps for resisting the damage mechanisms listed below. It covers materials, welding, testing, and other fabrication requirements. It is intended to be used by refiners, equipment fabricators, engineering contractors, and construction contractors.

This Standard Practice (SP) was developed as a result of a previous Technical Committee Report (TCR), NACE Publication 8X194, which was titled “Materials and Fabrication Practices for New Pressure Vessels Used in Wet H₂S Refinery Service.” The objective of that TCR was to provide a state-of-the-art overview of the options for materials selection, fabrication, post-weld heat treatment (PWHT), inspection, and testing practices that have been applied to new pressure vessels (referred to in this document as equipment) intended for use in wet H₂S refinery service.