Compressor’s Calculation Mode?
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The Calculation Mode for Compressors comes in two types: ASME and GPSA. Are there any differences between these two calculation modes?
GPSA Engineering Data Book Method: This method is most commonly used in the industry and is an option available in PRO/II. PRO/II employs two different equations, depending on the compression ratio; if the compression ratio is lower than the default value of 1.15, the “GPSA Temperature equation” is used, while for higher compression ratios, the “GPSA Head equation” is applied. ASME Method: The ASME Power Test Code 10 method is an analytical and more rigorous approach, and it is the default method in PRO/II. It tends to perform well across a wider range of compression ratios and feed compositions compared to the GPSA method.
There are differences: generally, those with a compression ratio of less than 1.15 belong to the GPSA category, while those with a higher compression ratio fall under the ASME category. Descriptions are available below the options.
However, in a simulated example I saw, the compression ratio was 13.76, yet GPSA was still the option chosen
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