SIS system certification
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Once the SIS system is in place, how is authentication carried out and how is the safety instrument system evaluated? Starting from January 1, 2018, all newly constructed chemical processing units and hazardous chemical storage facilities that fall under the category of “two key areas and one major hazard” must have safety instrument systems designed in accordance with relevant requirements. For the safety instrument systems of other newly built chemical processing units and hazardous chemical storage facilities, starting from January 1, 2020, it is necessary to comply with the requirements of functional safety standards and design safety instrument systems that meet those requirements.
This post was last edited by Concave Blade Hero on 2019-3-8 at 16:48. **Guiding Opinions of the State Administration of Work Safety on Strengthening the Management of Chemical Process Safety Instrumentation Systems, Document No. An Jian Zong Guan San [2014] No. 116 – Subpoints 15 and 16 under item six, which is the latter point you cited. We need to hurry up with this task. First conduct HAZOP, then LOPA – that’s roughly the procedure
In my opinion, the verification of the SIS system for existing installations should be carried out in two steps: first, a HAZOP analysis (or other risk analysis) must be conducted, followed by the formulation of requirements for the installation of interlock circuits as well as a list specifying their priority levels. Then, based on this, verify whether the instruments, valves, etc. in the existing SIS system and related circuits meet the relevant requirements, and make up for any deficiencies as soon as possible. If there are any mistakes, please ask experts to point them out!
This post was last edited by Yunmu on 2019-3-26 at 12:35. Hello, what you are referring to should be the functional evaluation of safety instrument systems: the classification and verification of Safety Integrity Levels SIL. As for how to do it, it generally requires hiring a professional company for an assessment. Simply put: use Hazard and Operability Analysis (HAZOP) for risk assessment, and then employ Layer of Protection Analysis (LOPA) to identify safety requirements to be assigned to the various interlock SIF loops in your existing SIS system. Then, the verification calculation for the SIL level is carried out.
How is an instrumentation system certified? First, clarify the concepts of sis, sif, and sil. According to relevant IEC standards, SIF is verified at the SIL level. First, the unit must undergo a Hazop study; based on the severity and frequency of the potential hazards, it is determined whether a safety instrumented system is necessary, and the SIL level is established according to the factor by which such systems can reduce risks. Then, SIL verification is performed on the designed safety instrument function loops. Check if it meets the requirements
First, the unit must undergo a Hazop study; based on the severity and frequency of the potential hazards, it is determined whether a safety instrumented system is necessary, and the SIL level is established according to the factor by which such systems can reduce risks. Then, SIL verification is performed on the designed safety instrument function loops. Check if it meets the requirements.