Regarding floating roof tanks and fixed roof tanks
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The petrochemical regulations state as follows: 6.2 Above-ground storage tanks for flammable liquids 6.2.1 The storage tanks shall be made of steel. 6.2.2 For storing liquids of Class A B and Class B A, floating roof tanks or internal floating roof tanks with metal float chambers should be used. For materials with special requirements, other types of storage tanks can be used. 6.2.3 For storing Class A, Group B liquids with a boiling point below 45°C, pressure or low-pressure storage tanks are recommended. 6.2.4 Fixed-roof tanks or low-pressure storage tanks for Class A B liquids shall adopt measures to reduce temperature rise due to sunlight exposure. For Class A and B liquids, when should a floating roof tank be chosen and when a fixed roof tank? What is used as the basis for making the distinction? If a fixed roof is used for volumes of 500 (or 200) cubic meters or less, and a floating roof is used for volumes above 500 (or 200) cubic meters, is it okay to determine this based on volume?
Personally, I think this cannot be classified based on volume; ordinary water tanks and sewage sedimentation tanks with a capacity of 5,000 cubic meters are also dome-shaped tanks； This mainly depends on the properties of the medium; for volatile mediums such as light oil, floating roof tanks are generally used to reduce losses of the medium due to the breathing action of the storage tank.
The choice of a floating roof tank depends mainly on the properties of the medium – whether it is volatile or not; only in such cases is a floating roof tank used!