Process Equipment and Plant Design
In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones ; because the smaller diameter tubes

Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less
None of these
Are less prone to fouling
Are easier to clean

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Process Equipment and Plant Design
A stuffing box is used for

Reducing the resistance of fluid flow
Prevention of fluid leakage around moving parts
Absorbing the contraction/expansion of pipeline due to temperature changes
Facilitating smooth opening and closing of a valve

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