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Discussion

Consider the following pairs of design document and what it shows:

Process flow sheet - Sequence of unit operations and streams

Material balance - Quantities of every stream in the process

Layout drawing - Physical positions of equipment on site

Flow sheet - Electrical single line arrangement

How many of the pairs given above are correctly matched?

  • A.Only one
  • B.Only two
  • C.All four
  • D.Only three

Answer: D

Correct answer: Only three

Three pairs are right: the flow sheet shows the sequence of operations and streams, the material balance the quantities in each, and the layout the physical positions. The fourth is wrong - the electrical single line diagram is a separate drawing altogether, and a process flow sheet says nothing about it.

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