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Process Equipment and Plant Design

Process Equipment and Plant Design
The equivalent diameter for fluid flow through a channel of constant non-circular cross section of area 'A' is given by (where, P = perimeter of the channel in contact with the fluid)

√A
4 A/P
4 P/A
A/P

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Process Equipment and Plant Design
In a shell and tube heat exchanger, the shortest centre to centre distance between the adjacent tubes is

Called tube pitch
Called tube clearance
None of these
Always less than the diameter of the tube

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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

300 and 500
5 and 10
180 and 300
45 and 75

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Process Equipment and Plant Design
The circumferential (hoop) stress in a thin walled cylinderical vessel under internal pressure is

pd/4t
pd/3t
pd/2t
pd/t

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Process Equipment and Plant Design
Rotary driers are most economically designed for the number of heat transfer units (HTU) from

0.01 to 1
10 to 20
5 to 10
1.5 to 2.5

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Process Equipment and Plant Design
The normal range of velocity of steam in pipes is __________ m/sec.

0.1-0.5
10-20
1-5
80-100

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