Once again, you have several options. 1. The tanks are too low relative to the source. They will fill and either overflow or if you have a altitude valve, shut off. Raise the top of the tanks so you can use the storage. Plus, if you make tank 2 taller, you may not need that air valve in front of it. 2. Set up three pressure zones, with a PRV between the reservoir and first tank setting the HGL in that zone and a PRV between the two tanks setting the HGL in that zone. You will need to cycle the PRV's so that you get some tank turnover. 3. Install a throttling control valve or PSV on the fill lines to each tank slowly. You will need a separate drain pipe with a check valve. Why do you have that booster pump in your system when the pressures are adequate without it? You could have a booster pump on a parallel line that could turn on during a fire but continuously running a pump doesn't make sense. Plus, get rid of those FCVs. You don't need them and they would be hard to control.
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