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Process Equipment and Plant Design

Process Equipment and Plant Design
Maximum acceptable total liquid gradient over a tray is about __________ mm.

12.5
45.5
5.5
30.5

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Process Equipment and Plant Design
In case of a shell and tube heat exchanger, the effect of L/D on inside film heat transfer co-efficient (hi) vanishes after a Reynold number of

5000
10000
1000
3000

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

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

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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

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

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Process Equipment and Plant Design
The longitudinal stress induced in a thin walled cylinderical vessel under internal pressure is

pd/2t
pd/8t
pd/4t
pd/t

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Process Equipment and Plant Design
In hydrostatic testing of welded pipe (for leakage, strength etc.) the ratio of minimum hydrostatic test pressure to internal design pressure is around

2.5
3.5
0.5
1.5

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