The performance of many antisurge control systems is degraded because they do not adequately compensate for variable gas properties (primarily molecular weight). The consequences can range from inefficient operation to serious compressor damage due to surges.

To eliminate deficiencies previously experienced, a new, relatively simple (requires measuring only three process variables) system was developed for a machine which normally compresses a 24.2 molecular weight gas, but is also required to operate on other gas mixtures of approximately 40% lower molecular weight. The new method is explained and the results compared with two other widely used concepts.

This content is only available via PDF.