Process Equipment and Plant Design
In perforated plate towers, the

All of these
Pressure drop is less compared is similar bubble cap towers
Hole sizes may be around 1/8" or 3/16"
Total hole area may be around 6 to 15% of tower cross-sectional area

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

Flow at a very slow velocity
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
Preferably flow inside the tube for its easier internal cleaning

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