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Process Flow Analysis. Goldratt: Balance flow not capacity. Our Goal: For a single product. Given: the process design Given: operation time and scrap rates at each operation Given: product demand Find: The flow in each operation and the total time required for each operation.

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Process flow analysis l.jpg

Process Flow Analysis

Goldratt: Balance flow not capacity

Paul A. Jensen

Operations Research Models and Methods

Copyright 2004 - All rights reserved


Our goal for a single product l.jpg
Our Goal: For a single product

  • Given: the process design

  • Given: operation time and scrap rates at each operation

  • Given: product demand

  • Find: The flow in each operation and the total time required for each operation


To construct a model you must know the process l.jpg
To construct a model you must know the process

  • The process is described by its operations



What happens to product flows at junctions l.jpg
What happens to product flows at junctions?

  • Do they assemble?

  • Do they combine?

  • Do they mix?

  • Do they disassemble?

  • Do they separate?

  • Do they split?


And nodes model flows that assemble l.jpg
“And” nodes model flows that assemble

  • The flows are equal on all entering and leaving arcs


Or nodes model flows that combine l.jpg
“Or” nodes model flows that combine

  • The total flow in equals the total flow out


Proportionality nodes model arbitrary combinations l.jpg
“Proportionality” nodes model arbitrary combinations

  • Input and output proportions are given



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