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

Liquor flows inside the tube, while the steam is outside submerging the tube
It is suitable for process, in which the final product is a liquor instead of solid
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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Process Equipment and Plant Design
When one of the fluids is highly corrosive and has fouling tendency, it should

Perferably flow outside the tube
Flow at a very slow velocity
Preferably flow inside the tube for its easier internal cleaning
Flow outside the tube, when the flow is counter-current and inside the tube when the flow is co-current

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