Factorio Forums

In an Angel & Bob-modded game I created a pipe connection between two chemical plants with the expectation that the pipe transports the fluid from the output port of the first chemical plant into the input port of the second chemical plant. However the fluid disappears and does not even appear in the pipe.
Here is a screenshot of the setup: In this attached savegame the situation is that the bug is present: As a workaround I am able to get the expected behavior by the following procedure:
1. delete the pipe between the two chemical plants (the left one in the screenshot)
2. place a new pipe at the same location

In the savegame I am able to trigger the bug more or less reliably (20% of all cases or more often) by
1. deleting the two plants and all surrounding structures (with ctrl-x)
2. pressing ctrl-z in order to let bots build the setup new

I have not managed to trigger this bug when placing the structures by hand - it seems like this only happens when building with bots.

Thanks for the report. Issue is now fixed for 1.1.31.

This was yet another weird corner case for the automatic fluid system purge logic which failed to detect that the fluidsystem had fluids above the threshold. It failed because the fluid content was able to cross 2 connections (50.0 from producer to pipe, then 50.0 from pipe to consumer) during single fluidbox update which messed with the purge check. The automatic purge logic was changed to one that will never fail again - it was removed entirely.

Thank you for resolving this problem so quickly.