Should fixed-roof tanks be used for sulfuric acid and nitric acid storage?
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93% sulfuric acid storage tanks at normal temperature and pressure; 98% nitric acid storage tanks also at normal temperature and pressure. I would like to ask whether fixed-roof tanks should be used for these storage tanks? Especially the nitric acid tanks~ There are also mixture storage tanks; one of the substances is propyl B and it is dissolved in methyl B, and they are stored together. Should an internal floating roof design be used for these tanks?
In accordance with Article 6.2.2 of GB 50160-2008: 1. Sulfuric acid should be stored in a dome tank; note that a sulfuric acid liquid seal is generally used, without the need for a vent valve or exhaust pipe, to prevent water vapor from entering and causing corrosion at the top. 2. Nitric acid should also be stored in a dome tank (I have not used this type of tank before, so the following issues need to be considered: A. The volatile gases are toxic; it is necessary to determine whether the emitted gases need to be captured and contained. B. The pressure of the gas phase at the operating temperature – it is possible to use a tank at atmospheric pressure, and it is likely that this will suffice). 3. Propanol B and substances dissolved in methanol B should be stored in floating roof tanks (since I do not know the properties and components of your materials, I can only recommend using floating roof tanks based on the characteristics of methanol B; however, it is necessary to consider whether your materials are prone to polymerization or oxidation)
For sulfuric acid and nitric acid, it is not necessary to use internal floating roofs; a fixed arch-type roof is sufficient.
93% of sulfuric acid storage tanks are generally vertical fixed-arch top tanks, while 98% of nitric acid storage tanks are generally horizontal tanks.