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The use of Damage Mechanisms (DM’s) has been successfully developed and applied in the Oil Refiningindustry for over 20 years. A damage mechanism is a specific combination of mechanical, chemical,physical, or other processes that result in equipment degradation (piping or equipment) during operation(active or shut down). These have been defined for Oil Refining (API RP 5711). API RP 571 issupplemented with some similar and some specific individual damage mechanism, by technical reports, recommended practices, publications, and bulletins from API, as well as from the National Association ofCorrosion Engineers (NACE - now known as the Association for Materials Protection and Performanceor AMPP), and the Welding Research Council (WRC).
Damage Mechanisms for oil refinery operating units have been well documented for over 20 years. Thesuccessful application of this methodology is the cornerstone of Risk-Based Inspection (RBI) and otherpredictive Asset or Mechanical Integrity technology that has provided improvements in equipmentreliability. Damage mechanism reviews have been applied to Ammonia Production Plants, which haveless variability in feedstocks and often very similar processing equipment. This paper provides anoverview of the potential unique damage mechanisms based on known process parameters, selectedthe appropriate inspection methods, and communicates relevant factors and possible mitigation optionsas a resource for ammonia production sites. This methodology has been implemented in numerousfacilities worldwide.
The purpose of this document is to provide materials and inspection guidelines to the corrosion engineer on the use of carbon and low-alloy steel vessels in anhydrous ammonia service. This also serves as a state-of-the-art report on stress corrosion cracking (SCC) of these materials in liquid ammonia storage operations.
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