Issue with the position of the tower bottom liquid level control valve
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When studying the PID diagrams of my own equipment, I see in many places requirements such as the minimum vertical distance between the liquid level control valve at the bottom of the tower (or tank) and the tangent line at that point being 3300 mm. What is the purpose of setting it this way? Why is it important to emphasize the location of the level control valve?
I haven’t encountered such a phenomenon here; we have many U-shaped bends, which are used to maintain the lowest possible liquid level in the tower.