Knock out drum sizing for 10 times velocity reduction

Question

How can I size a drum such that the velocity is reduced by 10 times inside the vessel. My velocity in the pipe entering the drum is 9.77 m/s. Velocity inside the drum should be 10 times less than 9.77 m/s

Answer 1

Since you know the size of the inlet pipe, find the area of the hole using $A=\pi r^2$. Multiple the area by 10. Since the drum is round, find the radius using $r=\sqrt {\frac {A}{\pi }}$. Multiply the radius by 2 to get the diameter.