Water Drawoff Leg
The water surge volume in the drawoff leg is found from criteria in Section 333. This is the volume between maximum and minimum levels shown in Figure 300-6. The rate at which 100-micron oil droplets will move upward is found from Equation 300-8 (or 300-7). Size the diameter of the drawoff leg so that the water velocity downward is less than the oil droplet velocity upward.
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