Emergency shut-off device
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Are there any size requirements for installing emergency shut-off devices on storage tanks? For example, is it necessary to install one on a 25-cubic-meter methanol storage tank?
It should be understood in accordance with the process requirements, rather than as a separate concept per tank or per device; this is for reference only.
Interim Provisions on the Supervision and Management of Major Hazard Sources of Hazardous Chemicals (**Order No. 40 of the State Administration of Work Safety**):. Emergency shut-off devices are installed for key facilities such as toxic gases, highly toxic liquids, and flammable gases among major hazard sources. The hazardous chemical storage areas that constitute Class I and Class II major hazard sources should be equipped with emergency shut-off functions and kept in operational status ； Primary or secondary major hazard sources involving toxic gases, liquefied gases, and highly toxic liquids shall be equipped with an independent Safety Instrumented System (SIS). Therefore, whether an emergency shut-off device is needed for this storage tank depends on whether it constitutes a major hazard source and what level of severity that hazard represents, as well as on whether it involves toxic gases, highly toxic liquids, or flammable gases.
Agree with what was said on the 2nd and 3rd floors!
In multi-tank systems, all tanks should be shut off at once; otherwise, how can isolation be achieved?
GB50160-2008 Code for Fire Protection Design of Petrochemical Enterprises 6.2.23 Storage tanks for flammable liquids should be equipped with automatic dehydrators, as well as level gauges and high-level alarms; where necessary, automatic interlock systems to cut off the feed supply can also be installed.
How large is the pipeline, and what size are the normal valves?