I have questions as a beginner in storage and transportation design

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I’ve only been in the design industry for a short time and am still a complete beginner. I have a few quite basic questions that I’d like to ask the experts here; I hope they can help me figure them out. I am currently working on a tank farm design, and I have the following questions: 1. For example, there are two gasoline tanks and one centrifugal pump; the gasoline is delivered from the reforming unit. Should the fuel be fed into both tanks simultaneously, or should it first be filled into one tank before moving on to the second one? 2. Can the storage tank take in material while discharging it? 3. All four gasoline storage tanks are equipped with nitrogen seals. When calculating the nitrogen consumption, should it be the sum of the discharge volumes from all four tanks, or just the discharge volume of one tank? 4. Storage tanks for different types of oil are all equipped with purging systems. Should the purging be carried out simultaneously, or for multiple tanks containing the same type of oil at once, or one tank after another in sequence? According to the specifications, the speed of steam purging must be no less than 30 m/s. Does this refer to a flow velocity of no less than 30 m/s at the DN25 fitting, or a flow velocity of no less than 30 m/s in the DN50 steam pipeline? I hope fellow sailors can help me figure this out. Thank you all~