Situation A -- We have 10+ silos that house flour, oil, sugar, and gluten. We receive multiple loads into silo's on a regular basis (daily, every other day). Silo's are sometimes completely emptied and are cleaned 2x/year.
Situation B -- We have 10+ minor ingredients that are each put into bins (maybe 1000-2000 lb/ bin). Once placed in the bin, the rest of the system is closed as each ingredient is weighed, mixed together, and put into a bag. The system can be 'purged' on a regular basis, but not fully cleaned, and the bins can be completely emptied.
In either situation if Lot A of an ingredient is put into a silo or bin, we have record of that. Since the bin/silo isn't completely emptied, at what point (amount of time) is Lot A considered negligible for tracking purposes? Does emptying out all bins an adequate 'reset' for lot #'s, or does a full cleaning of the system need to take place?
We are moving towards an electronic method of lot tracking for these ingredients, and we are struggling with at what point do we no longer consider Lot A being in the system. Any suggestions/recommendations/guidance?