Do the field instruments of the SIS system and the DCS system need to be separated?
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Do the field instruments of the SIS system and the DCS system need to be separated? Which expert can explain this?
There’s no need; in fact, the safety levels of the instruments on site are quite high these days
Different SIL levels have different requirements
The instruments of the SIS system and those of the DCS system must be separate. If a measurement point in a process is required to participate in both control and interlock functions, it depends on the SIL level. SIL0 can be achieved by using one instrument connected to the DCS system for control and interlocking, while SIL1 and above require a separate instrument connected to the SIS system for interlocking purposes. It is completely separated from the control of the DCS system. Therefore, interlocks do not necessarily require a SIS system; however, if a SIS system is already in place, the instruments related to that SIS system should be used solely for interlocking purposes within the SIS system, separate from the DCS system.
Someone asked about this not long ago; for more details, see \"GBT 50770-2013 Code for Design of Safety Instrumented Systems in Petrochemical Industries\"
I think so too, but the regulations aren’t clear
According to the LOPA definition, BPCS and SIS are independent protection layers. The respective on-site forms must of course be kept separate.
The SIS system is a safety interlock protection system; it must be separated from the DCS and installed independently. This is a **mandatory requirement, and the specific details can be found in the relevant documents. **Guiding Opinions of the State Administration of Work Safety on Strengthening the Management of Chemical Process Safety Instrumented Systems (Document No. An Jian Zong Guan San [2014] 116) http://www.chinacoal-safety.gov.cn/newpage/Contents/Channel_21111/2014/1119/243090/content_243090.htm
SIS instruments must have safety certification! ~
An independent S|s system is set up for the processes under key monitoring.