Process Equipment and Plant Design
Any shell opening greater than 5 cms for a storage tank must be reinforced for reason of

None of these
Making the joint leak proof
Reduction of discontinuity in shape at the junction
Preventing the local overstressing of the shell around the opening

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Process Equipment and Plant Design
Overall tray efficiency of a distillation column is the ratio of the number of

Overall gas transfer units to the number of ideal trays required
Real trays required to the number of ideal trays required
Ideal trays required to the number of real trays required
None 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
Perferably flow outside the tube
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

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