Process Equipment and Plant Design
Wind load consideration in the design of a support can be neglected, when the vessel is

None of these
Tall but empty
Tall (say 30 metres), but is full of liquid
Short (< 2 m) and housed indoor

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Process Equipment and Plant Design
In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be

More than that for fluid flow
Less than that for fluid flow
Same as that for fluid flow
D₂ - D₁ (D₁ and D₂ are I.D. of inner and outer pipes respectively)

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