A P&ID on the wall cannot tell you what happens next.

Twenty-two refinery units, each one a live drawing. Hover a vessel and it says what it does and what it takes with it when it fails. Trace a system and the rest of the sheet dims. Walk a real failure step by step, with the alarms it raises on the board.

Built by OEG for the trainers who have three weeks to get a new operator ready - and for the operator who has to run the unit at three in the morning.

One page per unit, and the page is the drawing.

ISA symbols, real tag numbers, hairline instrument signals - a sheet an engineer recognises and a new hire can interrogate. Nothing asks the reader to correlate a diagram with a paragraph three pages later.

Five ways to ask the drawing a question, all of them on every unit:

P-101, the charge pump, just tripped.

Feed flow dies and FC-101 rings LOW-LOW. Step forward and the failure moves through the preheat train, the heater and the tower in the order the board would see it - with the operator's move at every step. Six of these ship on CDU-100 alone; 106 across the series.

The sheet is not the only way in.

Two more tools sit on the CDU-100 page. One puts the reader in the unit; the other takes the sheet away and asks them to draw it.

Crude Distillation, open end to end.

Cuts 200 kbpd of crude into naphtha, kerosene, diesel and atmospheric residue. No reboiler anywhere on the unit - every drop of vapour in that tower comes from the fired heater and the stripping steam, which is exactly why it is the unit we hand people first.

The other 21 units are catalogued below and ship with the library. Seven advanced modules - the operator round, the console, the procedures - are in build on top of this same unit.

A check per unit, marked against the drawing.

423 questions across 22 checks, each with a pass mark set for that unit. Four kinds, and the last one is the kind trainers ask for by name.

Every question links back to the exact vessel, loop, stream or scenario it came from, so a review session is spent on the drawing rather than on the answer key.

Twenty-two units from crude receipt to blending, joined by 40 numbered inter-unit streams. The map ships with the library and traces plant-wide systems - hydrocarbon, hydrogen, sulfur, relief - the same way the unit pages do.

Walk one unit with your own experts in the room.

Tell us which unit your next turnaround or new-hire class is about. We will open that page with your people, take their redlines, and show you how the check is marked.