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I have a cylindrical tank :

- inner diameter is 2 m

- capacity 50 m3

- hight over ground 0.5 m (50 cm) from ground to tank bottom

- the tank is 60% full of liqued and 40% gas , the pressure inside

the tank is 3 bar :

What is the drain size (diameter) that allow to get 2.8 m3/h of the liquid , without using any pumps , just by the pressure force inside the tank ?

and thanks for your help