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The block or rectangles used represent a unit operation. The blocks are connected by straight lines which represent the process flow streams which flow between the units. These process flow streams may be mixtures of liquids, gases and solids flowing in pipes or ducts, or solids being carried on a conveyor belt.
In order to prepare clear, easy to understand and unambiguous block flow diagrams a number of rules should be followed:
This figure depict a very small and simplified BFD:

Example - Block Flow Diagram
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