Overall distillation column efficiency for most of the refinery columns can be given by (for μ = 0.07 - 1.4 cp and relative volatility < 4) (where η = overall column efficiency, % μ = molal average viscosity of feed at average column temperature and pressure, cp Δp = pressure drop per tray, psi)

Process Equipment and Plant Design
Overall distillation column efficiency for most of the refinery columns can be given by (for μ = 0.07 - 1.4 cp and relative volatility < 4) (where η = overall column efficiency, % μ = molal average viscosity of feed at average column temperature and pressure, cp Δp = pressure drop per tray, psi)

Η = 17 - 61.1 log μ

Η = 24.6 (Δp/μ)

Η = 1.66 - 0.25 log μ

Η = 0.25 log μ - 1.67

Η = 17 - 61.1 log μ

Η = 24.6 (Δp/μ)

Η = 1.66 - 0.25 log μ

Η = 0.25 log μ - 1.67

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Process Equipment and Plant Design
A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator

Employs high velocity, high heat transfer rate and less heating surface requirement

Is economical in operation

Employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle

Both B & C

Employs high velocity, high heat transfer rate and less heating surface requirement

Is economical in operation

Employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle

Both B & C

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Process Equipment and Plant Design
Maximum acceptable total liquid gradient over a tray is about __________ mm.

30.5

45.5

12.5

5.5

30.5

45.5

12.5

5.5

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Process Equipment and Plant Design
The wall thickness for a large high pressure pipeline is determined by the consideration of the

Temperature stresses

Forces exerted by static and dynamic action at bends

Axial tensile stress in the pipe

Circumferential pipewall tension

Temperature stresses

Forces exerted by static and dynamic action at bends

Axial tensile stress in the pipe

Circumferential pipewall tension

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Process Equipment and Plant Design
Normally, the plate thickness of the bottoms and roofs of vertically cylindrical storage vessels as compared to that of the cylindrical shell is

More or less depending upon the pressure & temperature inside the vessel and the nature of the fluid contained therein

More

Same

Less

More or less depending upon the pressure & temperature inside the vessel and the nature of the fluid contained therein

More

Same

Less

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Process Equipment and Plant Design
Baffles are provided in a shell and tube heat exchanger to increase the turbulence and velocity of the shell side fluid. Which of the following shaped baffles does not fall in the category of transverse baffle?

Segmental baffle

Flat plate extending across the wall

Helical type baffle

Disk type baffle

Segmental baffle

Flat plate extending across the wall

Helical type baffle

Disk type baffle

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Process Equipment and Plant Design

Process Equipment and Plant Design A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator

Process Equipment and Plant Design Maximum acceptable total liquid gradient over a tray is about __________ mm.

Process Equipment and Plant Design The wall thickness for a large high pressure pipeline is determined by the consideration of the

Process Equipment and Plant Design Normally, the plate thickness of the bottoms and roofs of vertically cylindrical storage vessels as compared to that of the cylindrical shell is

Process Equipment and Plant Design Baffles are provided in a shell and tube heat exchanger to increase the turbulence and velocity of the shell side fluid. Which of the following shaped baffles does not fall in the category of transverse baffle?

Process Equipment and Plant Design
A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator

Process Equipment and Plant Design
Maximum acceptable total liquid gradient over a tray is about __________ mm.

Process Equipment and Plant Design
The wall thickness for a large high pressure pipeline is determined by the consideration of the

Process Equipment and Plant Design
Normally, the plate thickness of the bottoms and roofs of vertically cylindrical storage vessels as compared to that of the cylindrical shell is

Process Equipment and Plant Design
Baffles are provided in a shell and tube heat exchanger to increase the turbulence and velocity of the shell side fluid. Which of the following shaped baffles does not fall in the category of transverse baffle?