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 = 1.66 - 0.25 log μ

Η = 24.6 (Δp/μ)

Η = 0.25 log μ - 1.67

Η = 17 - 61.1 log μ

Η = 1.66 - 0.25 log μ

Η = 24.6 (Δp/μ)

Η = 0.25 log μ - 1.67

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Process Equipment and Plant Design
In a shell and tube heat exchanger, the 'tube pitch' is defined as the

None of these

Shortest distance between two adj acent tube holes

O.D. of the tube for square pitch

Shortest centre to centre distance between adjacent tubes

None of these

Shortest distance between two adj acent tube holes

O.D. of the tube for square pitch

Shortest centre to centre distance between adjacent tubes

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Process Equipment and Plant Design
Ratio of tube length to shell diameter for a shell and tube heat exchanger is

4 : 1 to 8 : 1 for liquid-liquid exchanger

Both B & C

8 : 1 to 12 : 1 for both liquid-liquid and gas-gas heat exchangers

< 4 : 1 for gas-gas exchangers

4 : 1 to 8 : 1 for liquid-liquid exchanger

Both B & C

8 : 1 to 12 : 1 for both liquid-liquid and gas-gas heat exchangers

< 4 : 1 for gas-gas exchangers

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to shell and tube heat exchanger.

Tie rods are fixed at one end in the tube sheet by making blind holes and the minimum number of tie rods is 4 with at least 10 mm diameter

Baffles are supported independently of the tubes by tie rods and positioned by spacers

Bracket supports are used for horizontal shell, while saddle support is used for vertical shell

Clearance between shell & baffles and between tube & baffles should be minimum to avoid by-passing of the fluid, but it should be enough to permit the removal of tube bundle

Tie rods are fixed at one end in the tube sheet by making blind holes and the minimum number of tie rods is 4 with at least 10 mm diameter

Baffles are supported independently of the tubes by tie rods and positioned by spacers

Bracket supports are used for horizontal shell, while saddle support is used for vertical shell

Clearance between shell & baffles and between tube & baffles should be minimum to avoid by-passing of the fluid, but it should be enough to permit the removal of tube bundle

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Process Equipment and Plant Design
Steam economy is defined as the amount of evaporation per unit amount of steam used, while the capacity is the total evaporation obtained per hour. Use of multiple effect in evaporation

Both B & C

Increases capacity

Increases economy

Does not affect the capacity

Both B & C

Increases capacity

Increases economy

Does not affect the capacity

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Process Equipment and Plant Design
In a double pipe concentric heat exchanger, the equivalent diameter of annulus for heat transfer would be (where, D₁ and D₂ are I.D. of inner and outer pipes)

(D₂² - D₁²)/D₂²

D₂ - D₁

None of these

(D₂² - D₁²)/D₁²

(D₂² - D₁²)/D₂²

D₂ - D₁

None of these

(D₂² - D₁²)/D₁²

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Process Equipment and Plant Design

Process Equipment and Plant Design In a shell and tube heat exchanger, the 'tube pitch' is defined as the

Process Equipment and Plant Design Ratio of tube length to shell diameter for a shell and tube heat exchanger is

Process Equipment and Plant Design Pick out the wrong statement pertaining to shell and tube heat exchanger.

Process Equipment and Plant Design Steam economy is defined as the amount of evaporation per unit amount of steam used, while the capacity is the total evaporation obtained per hour. Use of multiple effect in evaporation

Process Equipment and Plant Design In a double pipe concentric heat exchanger, the equivalent diameter of annulus for heat transfer would be (where, D₁ and D₂ are I.D. of inner and outer pipes)

Process Equipment and Plant Design
In a shell and tube heat exchanger, the 'tube pitch' is defined as the

Process Equipment and Plant Design
Ratio of tube length to shell diameter for a shell and tube heat exchanger is

Process Equipment and Plant Design
Pick out the wrong statement pertaining to shell and tube heat exchanger.

Process Equipment and Plant Design
Steam economy is defined as the amount of evaporation per unit amount of steam used, while the capacity is the total evaporation obtained per hour. Use of multiple effect in evaporation

Process Equipment and Plant Design
In a double pipe concentric heat exchanger, the equivalent diameter of annulus for heat transfer would be (where, D₁ and D₂ are I.D. of inner and outer pipes)