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Process Equipment and Plant Design

Process Equipment and Plant Design
Welded joint efficiency in the design of chemical process equipment is taken as

0.95
0.55
0.75
0.85

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Process Equipment and Plant Design
Diameter of rivet hole (d, mm) and the plate thickness (t, mm) are related by Unwin's formula as

D = 3√t
D = 1.6 √t
D = 1.5 t
D = 1.1 t

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Process Equipment and Plant Design
Needle valves are generally not used for

Very large diameter pipes
Smaller sizes of pipe
High pressure throttling service
Very accurate flow control

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Process Equipment and Plant Design
Normally, the length to diameter ratio of rotary dryers varies form 4 to 10 and for its economic operation, the number of transfer units (NTU) for such dryers varies from

1.5-2.5
3.5-5.5
7.5-10.0
44119

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Process Equipment and Plant Design
__________ of water makes it a widely used coolant in heat exchangers.

Low corrosiveness
Low dirt factor
Low viscosity
High specific heat

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Process Equipment and Plant Design
Fouling factor must be included in the calculation of over all design heat transfer coefficient, when the liquid

Is of high specific gravity
Containing suspended solids flows at high velocity
Containing suspended solids flows at low velocity
Is highly viscous

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