How to determine the SIL level when selecting instruments
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I would like to ask everyone: in a coal-water slurry gasification project, which instruments within the various processes (coal grinding, gasification to produce syngas, oxygen supply, and slag treatment) are required to have an SIL rating? Or do all the control loops of the entire project need to meet SIL requirements? How to determine what SIL level the instrument requires?
First, it is necessary to determine an SIL level; the level can be increased or decreased depending on the circumstances during the HAZOP analysis. So how should this level be determined now?
Based on the Hazop analysis, risks and risk events are identified; certain measures can be taken to avoid these risks. Further LOPA analysis can be conducted, along with the addition of additional protective layers. A SIL rating can be determined for each SIF loop by using the instruments and components employed in that loop to calculate the PFD
First, conduct a HAZOP analysis; it will identify the instruments that require a certain SIL level. After that, perform a SIL assessment to determine the appropriate SIL level
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For such devices, the SIL level is set at 3; as for the exact locations of the control points, these can be determined only after conducting a HaZoP analysis in collaboration between the process engineering and instrumentation teams