Seeking advice on nitrogen flow rate, consumption, and tank heating issues

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Good evening, everyone. I have just started working on the design of the tank area, and there are some basic questions I’m not sure about, so I’d like to ask for your help. 1. There are two benzene tanks in this tank area, equipped with hot water heating; there are two hot water inlets and two outlets in front of the tanks. I want to know whether the heating water is supplied to both tanks at the same time, or one after the other? When supplying water, are two inlet pipelines used simultaneously? Or separately? 2. What is the typical gas flow rate in steam, nitrogen, and instrument air pipelines? I checked some standards; some state that for nitrogen purging, the flow rate should be above 20 M/S, while others suggest calculating it based on a maximum allowable pressure drop of 7 KPa per 100 meters. I’m completely confused. . . . Does this flow rate refer to the flow rate in utility pipelines such as those for nitrogen, or to the flow rate when nitrogen is used for purging in other pipelines? If calculated based on pressure drop, the flow velocity is only around 5 m/s. For example, in a DN50 nitrogen pipeline used for purging, how should the nitrogen supply volume be calculated?