Queueing Network — Warehouse Picking
Pick-to-despatch flow for 620 orders an hour with a mis-pick rework loop from quality check back to the pick face, identifying pack — not picking — as the station that breaks the 85% target.
Make it your own.
title "Fulfilment centre — pick to despatch"
target 85%
arrivals Induct 620/h
station Induct { servers: 3; service: 14s }
# Pick walk distance varies enormously across the building, so cv 1.35.
station "Pick face" { servers: 22; service: 105s; cv: 1.35 }
station "Quality check" { servers: 2; service: 40s }
station Pack { servers: 13; service: 68s }
station Despatch { servers: 5; service: 22s; capacity: 60 }
route Induct -> "Pick face" 1.0
route "Pick face" -> "Quality check" 0.18
route "Pick face" -> Pack 0.82
route "Quality check" -> "Pick face" 0.09 # wrong item — re-pick
route "Quality check" -> Pack 0.91
route Pack -> Despatch 1.0
route Despatch -> exit 1.0