05:30 · Oil trunk pipeline · before sunrise
This oil sets like wax below thirty degrees.
Every heating point along the line burns gas so it keeps moving across the steppe.
Keeping heavy oil warm
Too little heat stops the pipe. Too much heat burns money.
Each heater is set from experience, one batch at a time. But batches differ: a heavier one cools faster and thickens sooner, and the person setting the furnace sees only the temperature leaving it, not the temperature it will have 150 km later.
So the safe habit is to overheat, every hour of every day.
One batch, kilometre by kilometre.
06:10
A heavier batch enters the line.
The pumping plan changes the oil in the pipe. Viscosity and pour point both go up. Nobody touches the heaters yet; nothing has gone wrong.
06:25
Fact against model.
Pressure at station 2 is 0.4 MPa below what the hydraulic twin expects. Before raising anything, the agent checks the sensors, the valve positions and the plan. The new batch explains it. No alert is needed.
06:40
The heating agent looks ahead.
At the current gas rate, the batch will reach heater 3 at 33 °C: a 3 °C margin above the point where it starts to set. Too close for a cold morning.
06:45
The twin prices the options.
Raise heater 2’s outlet by 2 °C and the batch arrives with a 5 °C margin, for a little more gas at one furnace instead of more gas at all of them.
06:50
The dispatcher approves.
The recommendation arrives with the batch passport, the thermal model and the procedure. The setpoint changes at one heater.
09:30
The batch arrives warm enough.
Heater 3 sees 35 °C, as the twin said. The agent records the forecast against the result and the next batch starts from a better model.
Who was on shift.
On a pipeline the crew is different. Fact versus model compares every pressure and flow with the hydraulic twin. Pumping regime picks pump combinations for each batch. Heating balance sets the furnaces. Pump-unit health compares every unit with its passport and its neighbours. They read the SCADA you already run; nothing is replaced.
Station 2 outlet 0.4 MPa below twin. Batch change at 06:10 explains it. No action needed.
Heater 2: raise outlet by 2 °C. Arrival margin at heater 3 rises from 3 °C to 5 °C.
Illustrative story
Built on the same ontology and digital-twin approach Faceplate runs on a national grid, read-only over the pipeline’s existing SCADA and leak-detection systems. Leak detection keeps the final word; the agents add a second, independent view.