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Process Equipment and Plant Design

Process Equipment and Plant Design
Which of the following is the best tube material from thermal conductivity point of view alone?

Carbon steel
Aluminium
Copper
Stainless steel

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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.

38
19
28
16

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Process Equipment and Plant Design
Angled baffles are preferred in the agitation tank to control the swirling action; if the viscosity of the liquid to be mixed is about 200 poise. However, the baffle may be completely eliminated for mixing liquids having viscoisty above __________ poise.

300
1500
1000
600

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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)

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

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Process Equipment and Plant Design
In a cylinderical vessel subjected to internal pressure, the longitudinal stress σL and the circumferential stress, σh are related by

σh = σL/2
σh = 2 σL
σh = σL
No relation exists

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

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

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