Process Equipment and Plant Design
Fouling factor must be included in the calculation of over all design heat transfer coefficient, when the liquid

Is of high specific gravity
Containing suspended solids flows at low velocity
Is highly viscous
Containing suspended solids flows at high velocity

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

The tube bundle is suspended on bracket
Downtake is formed by the annular space between the bundle and the shell
It is used for high viscosity liquor having large rate of scaling
There is no central downtake

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