PERT — Refinery Unit Turnaround
Shutdown network for a catalytic reformer turnaround from feed-out and nitrogen purge through catalyst change and vessel inspection to reinstatement, with the reactor internals on the critical path.
Make it your own.
title "Catalytic reformer turnaround — 21-day shutdown"
unit hours
task A "Feed out and depressurise" duration 12
task B "Steam out and nitrogen purge" duration 18 after A
task C "Blind and isolate battery limits" duration 16 after B
task D "Open reactor manways" duration 8 after C
task E "Unload spent catalyst" duration 30 after D
task F "Inspect reactor internals" duration 24 after E
task G "Repair scallops and centre pipe" duration 36 after F
task H "Load fresh catalyst" duration 26 after G
task I "Heat exchanger bundle pull and clean" duration 40 after C
task J "Furnace tube inspection and decoke" duration 34 after C
task K "Relief valve overhaul and certification" duration 28 after C
task L "Box up and leak test" duration 14 after H,I,J,K
task M "Remove blinds and reinstate" duration 10 after L
task N "Dry out and nitrogen circulation" duration 16 after M
task O "Feed in and on-spec product" duration 20 after N
milestone Q "Unit back on line" after O