Process Equipment and Plant Design
Optimum economic pipe diameter for fluid flow is determined by the

Density of the fluid
Viscosity of the fluid
None of these
Total cost considerations (pumping cost plus fixed cost of the pipe)

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of a horizontal tube evaporator.

Its usual dimensions are: tube dia = 2-3 cms; evaporator body dia = 1-4 metres and evaporator height = 2.5-4 metres
Liquor flows inside the tube, while the steam is outside submerging the tube
It is unsuitable for concentrating those liquids, which form a scale or deposit salt
It is suitable for process, in which the final product is a liquor instead of solid

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