With the performance characteristics of a turbocompressor based on one gas, it is possible to predict the approximate performance with other gases. The need for performance correlation and the advantages and limitations of the method presented are discussed from a test and application standpoint. Parameters are derived and given on charts, with a discussion of the significant factors and effects. Experimental data are correlated, demonstrating the validity and simplicity of the method. It is proposed that similar parameters and charts be incorporated into the Power Test Codes.

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