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 = 24.6 (Δp/μ)

Η = 1.66 - 0.25 log μ

Η = 17 - 61.1 log μ

Η = 0.25 log μ - 1.67

Η = 24.6 (Δp/μ)

Η = 1.66 - 0.25 log μ

Η = 17 - 61.1 log μ

Η = 0.25 log μ - 1.67

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Process Equipment and Plant Design
Filtration rate is affected by the

Cake & filter medium resistance

Pressure drop across the cake & filter medium

All of these

Area of filtering surface & the viscosity of filtrate

Cake & filter medium resistance

Pressure drop across the cake & filter medium

All of these

Area of filtering surface & the viscosity of filtrate

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Process Equipment and Plant Design
Thin spherical shells subjected to internal pressure, develop __________ stresses.

Radial

Neither A nor B

Both A & B

Circumferential

Radial

Neither A nor B

Both A & B

Circumferential

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Process Equipment and Plant Design
A perforated plate has holes of diameter dh arranged in a pitch ph. Each hole has a tube of I.D. dt passing through it. The ligament efficiency is given by

(ph - dt)/ph

(ph - dh . dt/2)/ph

(ph - dh)/dh

(ph - dh)/ph

(ph - dt)/ph

(ph - dh . dt/2)/ph

(ph - dh)/dh

(ph - dh)/ph

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Process Equipment and Plant Design
Holes of a sieve tray are arranged in triangular pitch of __________ times the hole diameter.

5 to 10

1.5 to 2

2.5 to 5

10 to 15

5 to 10

1.5 to 2

2.5 to 5

10 to 15

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Process Equipment and Plant Design
In seive plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally __________ times the hole diameter to give the required hole area.

5 to 10

2.5 to 4.0

0.5 to 1.5

10 to 15

5 to 10

2.5 to 4.0

0.5 to 1.5

10 to 15

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Process Equipment and Plant Design

Process Equipment and Plant Design Filtration rate is affected by the

Process Equipment and Plant Design Thin spherical shells subjected to internal pressure, develop __________ stresses.

Process Equipment and Plant Design A perforated plate has holes of diameter dh arranged in a pitch ph. Each hole has a tube of I.D. dt passing through it. The ligament efficiency is given by

Process Equipment and Plant Design Holes of a sieve tray are arranged in triangular pitch of __________ times the hole diameter.

Process Equipment and Plant Design In seive plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally __________ times the hole diameter to give the required hole area.

Process Equipment and Plant Design
Filtration rate is affected by the

Process Equipment and Plant Design
Thin spherical shells subjected to internal pressure, develop __________ stresses.

Process Equipment and Plant Design
A perforated plate has holes of diameter dh arranged in a pitch ph. Each hole has a tube of I.D. dt passing through it. The ligament efficiency is given by

Process Equipment and Plant Design
Holes of a sieve tray are arranged in triangular pitch of __________ times the hole diameter.

Process Equipment and Plant Design
In seive plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally __________ times the hole diameter to give the required hole area.