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This paper will present the methodology employed to re-rate a centrifugal compressor for increased capacity of the station. The uniqueness of this re-rate is that a company performed it other than the original equipment manufacturer and the design utilized many existing components to minimize the cost of the re-rate. Items of concern of the end user that must be addressed when this is done include reliability, performance, minimization of down time in implementing the new hardware, parts interchangeability, review of special tools requirements, updated instruction manuals and changes in maintenance methods of the equipment. The particular compressor was in operation at Florida Gas Transmission’s Station 15 at Perry, Florida. The goal of the re-rate was to optimize the throughput capacity of the compressor due to changing operational conditions. Concerns addressed were matching compressor re-design to the newly uprated capacity of the turbine, minimization of the downtime associated with obtaining the required internal dimensions, integration of the new compressor design to existing auxiliary systems to minimize changes and cost, documentation of maintenance provisions and special tools requirements. The paper will detail the process employed and discuss the results obtained. Other end users can use this information as a framework of the process and key issues to be evaluated as part of the re-rate process.
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