October 2022

Maintenance and Reliability

Case studies: Evaluation of the soundness and remaining life of PSA vessels with weld defects

Multiple defects were found in pressure swing adsorption (PSA) vessels during an outage of one of four PSA process units.

Lee, S., SK Energy; Kwon, O., Quest Integrity

Multiple defects were found in pressure swing adsorption (PSA) vessels during an outage of one of four PSA process units. The option for immediate repair during the shutdown was infeasible due to time constraints, particularly without new catalysts for replacement. The concerns were whether the equipment was safe to start up again after the outage and how long the vessels could continue to be operated. A fitness for service (FFS) assessment and remaining life assessment were undertaken to assess the current status of the cracks (defects), and to assist in future outage plans and inspection based on the remaining life results. A 3D finite element (FE) model of a PSA vessel was generated to d

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