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Process Equipment and Plant Design

Process Equipment and Plant Design
Holes of a sieve tray are arranged in triangular pitch of __________ times the hole diameter.

10 to 15
5 to 10
2.5 to 5
1.5 to 2

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Process Equipment and Plant Design
Elastic failure of a material occurs, when the tensile stress equals yield strength, yield point or the elastic limit. Also, the elastic failure occurs according to maximum strain theory, when the maximum tensile strain equals (where, σ = yield strength and E = modulus of elasticity)

Σ/E
E/σ
Σ
E

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Process Equipment and Plant Design
In packed towers provided with pall rings liquid redistributors are positioned at heights of every 6 metres or 5-10 times the column diameter, whichever is less. Maximum size of the pall rings should not exceed __________ of the column diameter.

1/5-1/10th
1/10-1/15th
1/2 to 1/4th
1/20-1/30th

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Process Equipment and Plant Design
In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the

Lower skirt clearance
Lower static submergence
Small downcomer liquid seal
Liquid gradient on the tray

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Process Equipment and Plant Design
Joint efficiency (J) for a seamless pipe is

1.2
< 0.5
0.85
1

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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.

19
28
38
16

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