A flow diagram that marks what and where materials flow, the unit operations and equipment needed, and additional information like operating temperature and pressure.

An example of this diagram is pictured below:

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- Qualitative 
- Quantitative 
- Combined-Detail

Flow Diagram Types

Peters, M. S., et al. Plant Design and Economics for Chemical Engineers. 4th ed., McGraw-Hill, 2003. 

Plant Design and Economics for Chemical Engineers: Fourth Edition

Qualitative Flow Diagram 

A flow diagram that indicates the specific quantities and materials required in a process, in addition to showing where materials flow.

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