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Process Equipment and Plant Design

Process Equipment and Plant Design
In a continuous distillation column, the optimum reflux ratio ranges from __________ times the minimum reflux ratio.

2.2 to 2.6
1.1 to 1.5
1.6 to 2
2.7 to 3

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Process Equipment and Plant Design
The necessary wall thickness for a metallic storage vessel is a function of the

Ultimate tensile strength (or yield point) of the material and operating temperature
Diameter of the vessel
All of these
Operating pressure and welding/joint efficiency

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Process Equipment and Plant Design
In a shell and tube heat exchanger having square pitch, the shell side equivalent diameter is given by (where, P = pitch, d = outside diameter of the tube)

Πd/4P²
(P² - πd²/4)/πd
4P²/πd
4(P² - πd²/4)/πd

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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
O.D. of the tube for square pitch
Shortest centre to centre distance between adjacent tubes
Shortest distance between two adj acent tube holes

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Process Equipment and Plant Design
Tube wall thickness depends on the cor-rosiveness of the fluids and their operating pressure & temperature and is specified by Birmingham wire gauge (B.W.G)-a number which varies from 8 to 18 with the numbers 14 and 16 being more commonly used. Outside diameter of tubes varies from about 15 to 50 mm; however a tube of less than __________ mm outside diameter is generally not recommended for fouling fluids.

28
38
16
19

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Process Equipment and Plant Design
Accidents in chemical plants are mostly due to

Failure of equipments
Faulty operating procedures
Improper layout of the equipments
Inadequate equipment design

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