Questions regarding the understanding of the anti-surge margin recalculation function block in Triconex
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I would like to ask the experts here: in the Triconex program, there is a functional block for recalibrating the margin related to compressor reverse surge. In other words, when surge occurs, it automatically recalibrates the MARGIN value in order to increase the overall safety margin and prevent surge from occurring again. What I don’t understand is how this functional block (Recal02) determines that the compressor has entered the surge zone – is it based on the MARGIN input parameter? Is it considered that the flow has entered the surge region when it drops to zero or a certain level? Thank you! As shown in the figure
When the actual margin is less than zero, that is, when the operating point is to the left of the surge line, it means that the system has entered the surge zone