I have two four-stage centrifugal air compressors (electrical driven) running in parallel, feeding a turbo-driven booster compressor. When an air compressor shuts down I lose the booster compressor because of overspeed or low suction pressure at the booster compressor. Can a DCS react fast enough to prevent loss of the booster compressor?
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Greg McMillan Forum Moderator 38 Posts
Re: Can a DCS react fast enough to prevent loss of the booster compressor?30 June 2010 at 1:29pmA DCS module execution time of 0.1 second should be fast enough. The bigger question may be whether the measurement, final control element, and feedback loop is fast enough. A feedforward action to preemptively change the final control element by an amount that corresponds to a required correction should be considered. If the final control element is pneumatically actuated valve or damper, feedforward action won’t save the day. The final control element needs to fast enough to significantly respond within the module execution time.