In a shell and tube heat exchanger, triangular pitch arrangement as compared to square pitch arrangement

Process Equipment and Plant Design
In a shell and tube heat exchanger, triangular pitch arrangement as compared to square pitch arrangement

Facilitates easier shell side cleaning; hence is more suitable for handling high dirt factor shell side fluid

Creates relatively lower turbulence on the shell side resulting in lower shell side heat transfer co-efficient

Can accomodate less number of tubes for a given shell diameter

Results in higher shell side pressure drop

Facilitates easier shell side cleaning; hence is more suitable for handling high dirt factor shell side fluid

Creates relatively lower turbulence on the shell side resulting in lower shell side heat transfer co-efficient

Can accomodate less number of tubes for a given shell diameter

Results in higher shell side pressure drop

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Process Equipment and Plant Design
Which tube arrangement in a heat exchanger would facilitate highest heat transfer rate?

Triangular pitch

Square pitch

Diagonal square pitch

Heat transfer rate is independent of tube arrangement

Triangular pitch

Square pitch

Diagonal square pitch

Heat transfer rate is independent of tube arrangement

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Process Equipment and Plant Design
Pressure drop due to pipe fittings can be estimated by the equation, ΔP/p = 4f.Le/D.V2/2gc, where, Le = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of Le/D (dimensionless) for 45° elbow and 180° close return bends would be respectively around

5 and 10

180 and 300

300 and 500

45 and 75

5 and 10

180 and 300

300 and 500

45 and 75

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of a basket type evaporator.

There is no central downtake

Downtake is formed by the annular space between the bundle and the shell

It is used for high viscosity liquor having large rate of scaling

The tube bundle is suspended on bracket

There is no central downtake

Downtake is formed by the annular space between the bundle and the shell

It is used for high viscosity liquor having large rate of scaling

The tube bundle is suspended on bracket

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the use of valve tray, seive tray and bubble cap trays in continuous distillation column.

Bubble cap trays though most expensive are the best in situations, where low vapour rates is to be handled and a positive liquid seal is essential at all flow rates

Murphree efficiency of all the three trays are nearly equal, however the peak efficiency is generally higher for seive and valve trays than the bubble cap

Maintenance cost for valve and seive trays are comparatively more than bubble cap tray due to their relatively complicated construction features

Valve trays have the highest turn down ratio (i.e. the ratio of the highest to the lowest vapour flow rates) and thus provides the maximum flexible operating range

Bubble cap trays though most expensive are the best in situations, where low vapour rates is to be handled and a positive liquid seal is essential at all flow rates

Murphree efficiency of all the three trays are nearly equal, however the peak efficiency is generally higher for seive and valve trays than the bubble cap

Maintenance cost for valve and seive trays are comparatively more than bubble cap tray due to their relatively complicated construction features

Valve trays have the highest turn down ratio (i.e. the ratio of the highest to the lowest vapour flow rates) and thus provides the maximum flexible operating range

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Process Equipment and Plant Design
Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchanger

Both B and C

Permits the use of less tubes in a given shell diameter

Facilitates comparatively easier external cleaning because of large clearance

Permits the use of more tubes in a given shell diameter

Both B and C

Permits the use of less tubes in a given shell diameter

Facilitates comparatively easier external cleaning because of large clearance

Permits the use of more tubes in a given shell diameter

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Process Equipment and Plant Design

Process Equipment and Plant Design In a shell and tube heat exchanger, triangular pitch arrangement as compared to square pitch arrangement

Process Equipment and Plant Design Which tube arrangement in a heat exchanger would facilitate highest heat transfer rate?

Process Equipment and Plant Design Pick out the wrong statement pertaining to the design of a basket type evaporator.

Process Equipment and Plant Design Pick out the wrong statement pertaining to the use of valve tray, seive tray and bubble cap trays in continuous distillation column.

Process Equipment and Plant Design Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchanger

Process Equipment and Plant Design
In a shell and tube heat exchanger, triangular pitch arrangement as compared to square pitch arrangement

Process Equipment and Plant Design
Which tube arrangement in a heat exchanger would facilitate highest heat transfer rate?

Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of a basket type evaporator.

Process Equipment and Plant Design
Pick out the wrong statement pertaining to the use of valve tray, seive tray and bubble cap trays in continuous distillation column.

Process Equipment and Plant Design
Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchanger