Compressor and pump controls are normally used to manage the injection of a fluid (compressible and incompressible) into a reservoir or pipeline. Some of the ? uids that are injected include water, methanol, carbon dioxide, natural gas and other gases. When injecting compressible ? uids, large centrifugal single and multi-stage compressors are used. However, correct control of these large units is essential if the operation is to be fault-

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