Setting of the buffer tank location and dimension specifications

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A buffer tank is installed at the pump outlet to stabilize pressure, and a flow meter is also present on the discharge pipeline. Existing issues: 1. After coming out of the pump, should it pass through the buffer tank first or the flow meter first? ； 2. When considering a buffer tank, is it sufficient to only take into account its volume, or does one also need to consider its shape (square, circular) and diameter (equivalent diameter)? The existing experimental equipment has a diameter of DN300, and the buffer tank is also designed with a DN300 diameter (this serves to extend the setup in front of the experimental equipment and act as a buffer). A sintered plate is used to separate the buffering device from the experimental apparatus (this creates some resistance, which helps to ensure a uniform pressure distribution). The medium used is compressed gas; I’m not sure if this approach is appropriate.