Issues regarding storage tanks containing highly toxic and extremely toxic hazardous materials
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Dear sea friends, our company currently has a new project that involves the design of several atmospheric-pressure storage tanks with volumes in the dozens of cubic meters each; these tanks have a flat-bottom and conical-top design, and they are used to store substances that are extremely or highly toxic. The design code adopted by the design unit is GB50341, but the general provisions of this standard clearly state that it is not applicable to extremely toxic and highly toxic hazardous media. As shown in the figure below. Other standards were also checked; NBT47003 and SH3167 state the same thing, indicating that they are not suitable for extremely toxic or highly toxic hazardous media. I would like to ask everyone: aside from the aforementioned standards, are there any other design standards for atmospheric pressure storage tanks?
Hello, regarding the design codes for atmospheric pressure storage tanks, in addition to GB50341, NBT47003, and SH3167, there are also internationally recognized design codes such as ASME BPVC Section VIII Division 1, API 650, and EN 14015 that can be used as references. These specifications generally include design requirements related to highly toxic and severely toxic hazardous substances. It is recommended that you choose the appropriate standard for design based on the actual circumstances. At the same time, it is necessary to ensure that the design complies with local laws, regulations, and safety standards. .
Since it contains toxic substances, why not design it as a cylindrical shape?
This post was last edited by AtlantisH on 2023-6-13 at 14:55. Highly toxic and extremely toxic hazardous substances can cause significant damage in the event of a leak, which is why there are specific requirements in place. Atmospheric pressure storage tanks don’t seem to exist; it is likely that they can only be designed in accordance with GB/T 150 and NB/T 47042-2014 for horizontal vessels. Since the operating pressure is at atmospheric level, such tanks are not subject to the regulations set out in TSG 21. The compilation guidelines for NB/T 47003.1-2022 also recommend using 150.
Be sure to clearly identify whether it is a medium with extreme and high hazards, not just a highly toxic or poisonous medium – the two are not the same thing.
At present, there are no relevant standards in China for storage tanks that hold extremely hazardous media. However, many large-scale storage tanks do contain such highly hazardous materials, especially those with a capacity of several hundred or even thousands of cubic meters; such tanks cannot be treated as pressure vessels. In terms of design, material selection, construction, testing, and acceptance, GB/T50341 and GB/T50128 are used as references. Additional strict requirements are imposed regarding ultrasonic testing of the steel plates, the type of flanges used on connections, the requirement that all welds be full welds, as well as non-destructive testing. Higher standards are also set for detecting leaks, and corresponding enhancements are necessary for ensuring the leakproofness of the tank foundations
Since the update of HG/T20660, the toxicity of some media such as benzene and sulfuric acid has increased; however, many design firms still use GB50341 as a reference for designing storage tanks
Follow industry practices and requirements
In-hospital review: to ensure compliance with the review technical regulations
Just use the API, right? We used to calculate based on normal pressure, but the standards for design, manufacturing, and inspection have been raised. In particular, material inspection, welding, non-destructive testing, testing, and bottom plate design (to prevent leakage from the bottom plate)
Just go to the design institute, and everything will be resolved