Process Equipment and Plant Design
Shortest distance between two tubes is

More in case of triangular pitch as compared to square pitch of tube layout
None of these
Called tube clearance
Called tube pitch

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

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
Flow at a very slow velocity

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