Centrifugal Compressors Rerates and Retrofits

It is often desirable to modify process conditions to improve overall plant efficiency or to increase production. However, this often requires rerating an existing compressor.

Before spending a considerable amount of time and effort in redesigning the process, it is advisable to make a preliminary feasibility estimate to determine the rerate capabilities of the existing compressor. This will identify various limitations and help avoid completing a total process redesign only to find out that a compressor cannot meet these new requirements.

The major areas which require evaluation include capacity, pressure, speed, and power. Consider consulting the OEM, and/or a Company specialist before making significant changes to any critical (unspared) centrifugal compressor.

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