Is the SIL assessment of instruments applied to all instruments in all control loops, or only to those in the SIS and ESD systems?
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Which instruments need to be included in the SIL assessment for refinery units? Do the instruments of the compressor’s built-in shutdown protection system require a SIL assessment? Do fire and gas detection systems require a SIL assessment? **Document No. 116 issued by the State Administration of Work Safety states that a chemical process safety instrumented system (SIS) includes safety interlock systems, emergency shutdown systems, as well as detection and protection systems for toxic and harmful gases, flammable gases, and fires. According to this definition, when conducting a SIL assessment for safety instrumented systems, it is also necessary to assess toxic and hazardous substances, flammable gases, as well as fire detection and protection systems. So how is a SIL assessment carried out for toxic and hazardous substances, flammable gases, and fire detection and protection systems?
A chemical process safety instrumented system (SIS) includes safety interlock systems, emergency shutdown systems, and detection and protection systems for toxic and harmful gases, flammable gases, and fires. The detection and protection systems for toxic and harmful gases, flammable gases, and fires must pass the inspection
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