May 2021

Special Focus: Maintenance and Reliability

Restaging/rerating of centrifugal compressors: Fundamentals, practices and challenges

The primary requirement for rerating or revamping an existing centrifugal compressor is to match the new operating requirements, such as increased or decreased flow, increased or decreased head, or a combination of both. Rerating or revamping is necessary where the existing compressor or compressor train is incapable of meeting the new operating requirement efficiently.

The primary requirement for rerating or revamping an existing centrifugal compressor is to match the new operating requirements, such as increased or decreased flow, increased or decreased head, or a combination of both. Rerating or revamping is necessary where the existing compressor or compressor train is incapable of meeting the new operating requirement efficiently. The rerating/restaging of operational existing compressors is an attractive cost-effective solution to address the latest development in process, changes in gas composition, debottlenecking of the existing plants and production maximization. Successful rerating/restaging plays a significant role in capital cost optimization

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