If we use L = 1.3 x D we have:

i.e. D = 1.23 m

Length of cylindrical vessel = 1.23 x 1.3 = 1.6 m

The interface for the required volumes of the light and heavy phase in the separator should be:

X = 0.46; Y = 0.54

Let the distance from the bottom of the separator to the reference line = C = 0.6 m

Light phase overflow height from the reference line

H₂ = X+Y+C = 0.41+0.59+0.6

The distance between overflow leg and underflow leg

Heavy phase underflow height

For practical reasons and to compensate for fabrication problem. Height H₁ should be designed 25 mm short and make the adjustable spool with 50 mm offset. Final heavy phase underflow height

H₁ = 1.5 - 0.025 + 0.05 = 1.525 m

Let the interface in the separator is located 0.15 m below the designed evaluation during the initial run. To raise the interface level, raise the adjustable spoul piece by

Thus for adjusted ΔH value of 0.032 m, the interface position in the separator moves by 0.15m in the same direction.