Compressor Case and Impellers

Tables 18-9A and 18-9B are a guide to a specific compressor case’s capabilities. This is not a standard for each manufacturer. On the contrary, they differ considerably. Figure 18-73 is also useful as a guide to inlet suction condition capacities for various case sizes. These case sizes have no relation to the cases in Table 18-9.
Figure 18-74 is an approximate guide for the number of impeller wheels that will be required to develop the compression ratio, P2/P1, for a selected group of gases using uncooled compressors. That is, no diaphragm cooling or liquid injection and no exterior cooling between wheels. This is the most common condition. Figure 18-75 is also useful in estimating wheel selection and head/stage or ...

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