Should the low-low level interlocks for the propylene oxide tank and the 3-chloropropene tank be connected to SISI? Which standard is the basis for this?
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Should the low-low level interlocks for the propylene oxide tank and the 3-chloropropene tank be connected to SISI? Which standard is the basis for this? Orders No. 40 and No. 16 issued by the State Administration of Work Safety do not specify this in such detail. The design institute only includes the high and high limits in the SIS, without addressing the low and low limits. Is there any standard or regulatory basis for including the low and low limits in the SIS?
SH3007 requires the setting of interlock shutdown for high and low liquid levels, but there is no requirement to integrate it into the SIS; likewise, no such requirement exists for high liquid levels
Yes, but in our area, the high and low liquid level sensors are connected to the SIS system; this is mainly done through various inspections and corrective actions carried out later on
Should the low-low level interlocks for the propylene oxide tank and the 3-chloropropene tank be connected to SISI? Which standard is the basis for this? Orders No. 40 and No. 16 issued by the State Administration of Work Safety do not specify this in such detail. The design institute only includes the high and high limits in the SIS, without addressing the low and low limits. Is there any standard or regulatory basis for including the low and low limits in the SIS? Is it necessary to integrate a SIS? First, it is necessary to determine whether a SIS is required through analyses such as PHA and LOPA, and the structure of the SIS (from a technical perspective) should be confirmed via SIL verification ； If SIS is not used in the analysis, it is still necessary to consider the assessment of major hazard sources specified in No. 40, as well as the safety instrumented systems that meet the standards regarding the design of major hazard sources as outlined in Document No. 116 (from a management perspective). As long as it is a spherical tank, the volume is definitely large; in most cases, it constitutes a major hazard source. From a management perspective, it is necessary to implement a SIS system. As for which systems should be equipped with such a SIS, this depends on analysis – generally, high liquid level monitoring systems are used more often, while low liquid level monitoring systems are less common. The original principle was to focus on technology first and then on management, but nowadays the approach is mostly to focus on management first and then on technology……
Order No. 40 of the State Administration of Work Safety and Article 3 of Order No. 79 stipulate that for major hazard sources of Grade 1 or 2 involving toxic gases, liquefied gases, or highly toxic liquids, an independent Safety Instrumented System (SIS) must be installed; this system includes monitoring for high and high liquid levels as well as low and low liquid levels, and both the inlet and outlet points must be connected to it.
Safety Supervision Administration General Order No. 3 [2014] 68 **Notice from the Safety Supervision Administration on Further Strengthening the Safety Management of Chemical Storage Areas: (1) Further improve the monitoring and control facilities in chemical storage areas. In accordance with regulatory requirements, high and low liquid level alarms are installed for the storage tank; automatic interlocks are employed to shut off the tank’s feed valve when the liquid level is too high, and to stop material transfer when the liquid level is too low. Ensure that the alarm systems for leaks of flammable, explosive, toxic, and harmful gases are in good working condition. Emergency shut-off valves must be installed on key storage tanks such as those for large-scale liquefied gases and highly toxic chemicals. Order No. 53 of the Su An Safety Supervision Department: Basic Requirements for the Diagnosis and Improvement of Inherent Safety issued by the Provincial Emergency Management Department:
Don’t say I won’t help you – by adhering to GB/T 507703, the Design Code for Safety Instrumented Systems in the petrochemical industry, we can ensure that your SIS meets the requirements of various inspection levels.
Whether to be included in SIS is not decided by an individual; it is determined after a SIL classification is carried out. SIL1 and above need to be integrated into the SIS. It will be considered as appropriate if needed.
Whether to be included in SIS is not decided by an individual; it is determined after a SIL classification is carried out. SIL1 and above need to be integrated into the SIS. It will be considered as appropriate if needed.
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