Floating inventory explainer

Why Australia can keep receiving fuel after a disruption

On a long tanker route, several cargoes are already at sea at the same time. That fuel is inventory in motion. If departures stop today, Australia does not run out immediately, because those already-sailing tankers keep arriving until the offshore pipeline empties.

Core relationship

ships in transit × fuel per ship = fuel already on the water
In the default short-route example, one ship carrying ten fuel-days means about ten fuel-days are already committed offshore.
Route Length
10 days
How long a tanker is at sea before docking.
Ships Already At Sea
1
Cargoes already committed before any new decision is made.
Fuel Already Offshore
10 fuel-days
Inventory physically on the water, not yet in storage tanks.
If Departures Stop Now
10 days
How long arrivals continue before the last tanker already underway docks.

Why the long route buys time

The fairest comparison holds tanker size constant and changes only distance. A long voyage commits more cargoes before the disruption even begins.

Short-route benchmark
10 days on water
Ships
1
Fuel afloat
10
Arrival tail
10 days
Current route
10 days on water
Ships
1
Fuel afloat
10
Arrival tail
10 days
Compared with a short route, this setting does not yet add extra offshore inventory. Increase the route length to see why longer voyages keep feeding Australia after a cutoff.

Longer route, more overlapping cargoes

The blue line shows ships already underway. The amber line shows how many fuel-days are already afloat. Both are labeled directly at the current route.

Holding tanker size constant, moving from a short voyage to a long one forces more cargoes to overlap offshore.
Disruption Clock
Pipeline still being replenished
No cutoff is running. New departures are still replacing the tankers that arrive.

What is already on the water

The sea lane below shows the same inventory as moving cargoes. That is why a far-away importer can keep receiving fuel after departures stop.

Export terminal
Australia
Already committed offshore One tanker is already sailing toward Australia carrying about ten fuel-days.
Pipeline full: new departures are still replenishing the route.
100% of offshore inventory still available

Three things your friend should notice

The point is not that distance creates fuel. The point is that distance shifts some of the storage system offshore, onto ships that are already underway.

1. Distance creates overlap

A short route only needs about one cargo in motion at a time. A longer route needs several cargoes overlapping across the lane.

2. Overlap becomes inventory

Those overlapping ships are not theory. They are real fuel-days already purchased, loaded, and sailing toward the importer.

3. The cutoff hurts later

When departures stop, arrivals continue until the last already-sailing tanker docks. That arrival tail is longer on long routes.

Current interpretation: one tanker is already offshore carrying about ten fuel-days, so Australia keeps receiving fuel for roughly ten more days even if departures stop right now.