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Process Equipment and Plant Design

Process Equipment and Plant Design
Value of Peclet number = ∞, is the representative of

Plug flow
Eddy diffusivity = 0
Laminar flow
Complete back mixing

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Process Equipment and Plant Design
The safe height (h) to diameter (d) ratio (i.e., h/d) for liquid/petro fuel storage tank of capacity more than 45 kilolitres is less than

1
3
3.5
2

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Process Equipment and Plant Design
Back-trapping in a distillation column results due to

Low gas velocity
Excessive liquid gradient over the tray
High gas velocity
Low reflux ratio

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Process Equipment and Plant Design
The ends of a cylinderical vessel can be closed by a head, which can be one of the four shapes. For the same thickness, choose the one which can withstand the highest pressure.

Torispherical
Ellipsoidal
Flat plate
Hemispherical

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Process Equipment and Plant Design
In a multipass shell and tube heat exchanger, the baffles on shell side is primarily provided for

Creating turbulence
Fixing the tubes
Reducing scale deposition
Increasing pressure drop

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Process Equipment and Plant Design
Normally, the length to diameter ratio of rotary dryers varies form 4 to 10 and for its economic operation, the number of transfer units (NTU) for such dryers varies from

1.5-2.5
7.5-10.0
3.5-5.5
44119

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