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Throughput Yield Definition

broken cookies - a throughput yield lossThroughput Yield Description

Throughput yield , sometimes called ‘first pass yield’ is a commonly used measure of material conversion efficiency .

What do we mean by yield? Put simply, it is “The ratio of optimal material usage to actual material usage”

Throughput yield = Optimal material usage/Actual material usage

Throughput Yield Calculation

Lets say that we have 20 raw beef steaks. I badly burn two of the, giving 18 edible cooked steaks.

The yield on the cooking process is 18/20 = 90%

Throughput Yield Example Losses

There are many types of yield losses, but some of the more common ones would include

  • Giveaway – where a product includes more material than specified. An example would be a carton of milk that contains 1050ml instead of the specified 1000ml per pack
  • Conversion losses – an example of this would be spillage during a mixing process or incomplete reaction.
  • Quality losses – where the raw material is converted but the finished product is not fit for purpose.

End-to-End Throughput Yield Calculation

In the steak example above the yield was just for the cooking part of the process. There may be further yield losses upstream and downstream of that process step. These process step yields need to be multiplied together to give the end-to-end process yield. For a process with subprocesses A, B and C..

Yield A x Yield B x Yield C = End to end process yield

 

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