Process Equipment and Plant Design
For a given design of bubble cap, the number of bubble caps to be used per tray is set by the

Allowable gas velocity through the slots
Diameter of the column
Plate spacing
All of these

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Process Equipment and Plant Design
When one of the fluids is highly corrosive and has fouling tendency, it should

Preferably flow inside the tube for its easier internal cleaning
Flow outside the tube, when the flow is counter-current and inside the tube when the flow is co-current
Perferably flow outside the tube
Flow at a very slow velocity

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