A New Methodology for Verifying Pressurized Start-Up of Centrifugal Compressors Driven by Direct-On-Line Electric Motor by Leveraging String Test Results and Dynamic Simulation Analysis
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Fixed Speed Electric Motors driving Centrifugal Compressors are designed considering the pressurized start-up as the most critical condition in terms of the torque requirement. Their capability is checked during the design phase by means of dynamic simulation, which unfortunately suffers from uncertainties, especially in the low speed range. String Test (Complete Unit Test as defined by API 617) is a powerful mean to validate and refine the dynamic simulation so to predict more accurately the behavior of the compressor train at site conditions and ensure the capability of the driver to start-up the compressor from Settled-Out condition. The present paper describes a new methodology to leverage Direct-On-Line Centrifugal Compressor String Test results to improve predictability of on-site pressurized start-up thanks to an enhanced dynamic simulation model. A case study is also presented showing how the methodology has been successfully applied to a reinjection compressor string.
Calosi, Mirco; Magnante, Luca; Ranieri, Riccardo; Kobbin, Ibrahim; Pelella, Marco; Lorenzini, Riccardo (2018). A New Methodology for Verifying Pressurized Start-Up of Centrifugal Compressors Driven by Direct-On-Line Electric Motor by Leveraging String Test Results and Dynamic Simulation Analysis. Turbomachinery Laboratory, Texas A&M Engineering Experiment Station. Available electronically from