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Process Equipment and Plant Design

Process Equipment and Plant Design
In a cylinderical vessel subjected to internal pressure, the longitudinal stress σL and the circumferential stress, σh are related by

No relation exists
σh = 2 σL
σh = σL
σh = σL/2

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Process Equipment and Plant Design
Heat transfer co-efficient, hG(Kcal/hr.m² .°C) and mass velocity of air, G (kg/hr.m² ) for air flow parallel to the surface in case of constant drying rate in batch drying is related as hG = 0.0176G0.8. But when the flow of air perpendicular to the surface is encountered, this equation changes to

1.004G0.8
HG = 0.0176G0.37
HG = 1.004G0.37
0.0176G1.37

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Process Equipment and Plant Design
In case of a shell and tube heat exchanger, the minimum shell thickness for carbon steel (inclusive of corrosion allowance) depends on shell diameter and is in the range of __________ mm.

43962
43895
44058
44183

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Process Equipment and Plant Design
Most of the storage vessels/tanks are made cylindrical, because of the fact that a cylinder

Is easy to fabricate
Both A & B
Has greater structural strength
Neither A nor B

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Process Equipment and Plant Design
The main purpose of providing stepping on the trays is to

Improve the flow condition
Decrease the pressure drop
Increase the residence time
Facilitate handling of large flow rate of liquid

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Process Equipment and Plant Design
For laminar flow (NRe < 2100) in steel pipe, the optimum inside pipe diameter is given by

Di, opt = 3 Q0.36 ρ0.18
Di, opt = 3 Q0.36 . ρ1.86 μ0.08
Di, opt = 3.9 Q0.45 . ρ0.23
Di, opt = 7.6 Q0.36 . ρ0.9

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