Vertical Knockout Drum – Vessel Outlet Nozzle Clearance

The distance between the outlet nozzle opening and top of the mist elimination device is recommended to be a minimum of 12 inches, increasing in relation to the diameter of the mist elimination device. The objective is to prevent channeling by promoting equal velocities across the entire surface area of the mist elimination device. Two policies are commonly used for determining the appropriate distance. The rule of thumb is 12 inches minimum or half the diameter of the mist elimination device, whichever dimension is greater. Figure P-9 illustrates examples for minimum nozzle outlet distance.

Minimum Recommended Clearance Between Outlet Nozzle and Top of Mist Elimination Device


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