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

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

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

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

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