Help! Is it necessary to install a SIS in an operational tank farm?
Thread Content
In existing old crude oil storage areas, if there are circuits with a SIL rating of SIL1–SIL2 as determined by the SIL assessment, is it necessary to install a SIS system? Are there any mandatory requirements? Which file is it?
Not all storage tanks are required to be equipped with a SIS; those that handle toxic gases, liquefied gases, or highly toxic liquids and constitute Class 1 or Class 2 major hazard sources must have an independent Safety Instrumented System (SIS). For more details, please refer to the post at https://bbs.hcbbs.com/thread-2986869-1-1.html
If it is not a major hazard source or a hazardous process falling within the scope of \"two major and one key\" categories, there is no mandatory requirement to install an SIS. If the SIL assessment indicates a risk level of SIL1-2, and there are no effective ways to avoid this issue through design changes (such as redesigning or eliminating certain scenarios), it is still advisable to install an SIS system.
Why do you evaluate? Since a rating has been determined, then instruments and equipment that meet the safety rating must be used. Can ordinary DCS or PLCs meet the safety requirements of SIL2?
It is generally required; it depends on whether you fall under the category of major hazard sources – first, conduct a HAOZP analysis
The parent company requires that a SIL assessment be carried out
It belongs to major hazard sources; it is the SIL that is determined after conducting a HAZOP analysis
Currently, tank areas are under strict supervision in the chemical industry; HAZOP analyses that are updated every three years, along with assessments for classifying major hazard sources, are mandatory. In the absence of a SIS safety system, rectification is generally required within a specified time frame; devices that were in use previously should complete the process by the end of 2018 (I think so).
It is required; GBT 50770-2013 \"Code for Design of Safety Instrumented Systems in Petrochemical Industries\" specifies this
For hazardous chemicals and major hazard sources that are subject to strict supervision, an SIS is required; specific details can be found in Document No. 116 issued by the Safety Supervision Bureau