I would like to ask about the replacement of materials stored in spherical tanks when switching to a new product
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There are currently 2 spherical tanks: one holds Zeng C5 and the other holds Zeng C4. The gas phase inside these tanks is very complex, containing both propane and olefins. There is also some residue at the bottom of the tanks, and compressors can only reduce the pressure by half. It is now planned to replace the contents of these two tanks with new material, and the requirements for this new material are very strict – it must not contain any olefins. How can I clean the tank as thoroughly as possible? Please advise!
The question you raised isn’t detailed at all, and it’s actually quite dangerous. The first thing to consider is what pressure rating the design of your tank is based on, and whether it meets that requirement Is the set pressure of the safety valve sufficient? Are all spherical tank accessories, pipeline valves, and other related components satisfactory? It’s not simply about checking whether the mixed requirements can be met or not. If these conditions are met, nitrogen can be used for purging and pressure release. If there is concern about safety, the process should be repeated several times; under normal circumstances this will ensure complete purification. It is important to check that the valves connecting the gas lines can be closed properly; it is advisable to use blind flanges to prevent contamination due to cross-contamination of gases. :)