Can manholes on containers for highly hazardous media be equipped with gaskets?
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Can gaskets be used for the manholes of ethylene oxide storage tanks? For example, HG/T21596.
It is possible; for the contact parts, materials such as 304 or fluorinated coatings will meet the requirements, while carbon steel can be used for welding the other non-contact parts.
It is not appropriate; in accordance with clause 5.3.3.2(c) of standard GB/T 151-2014, when the toxicity of the medium is classified as extremely high, a lining structure shall not be used.
It was after reading this that I had doubts
For manholes on containers handling highly hazardous media, gaskets can be used for sealing. In accordance with the relevant provisions of the \"Design Code for Ethylene Oxide Storage Tanks\" (HG/T21596), the appropriate gasket material for ethylene oxide storage tanks can be selected, and it should be installed and maintained in compliance with the code requirements to ensure the sealing performance and safety of the manholes. The use of gaskets can effectively prevent leaks of highly hazardous materials and the intrusion of external substances, thereby enhancing the safety performance of storage tanks. .
Regarding the owner’s question, for highly hazardous media, there are no standards that prohibit the use of lined manholes. However, in the case of ethylene oxide, it tends to polymerize in the presence of iron ions and other substances, which can lead to explosions. Out of caution, it is best not to use lined manholes.