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maybe the pumping speed is wrong the tooltip says 12.000 after a ~60sec test i had ~1450 units/sec
so i think is a typing error and 1.200 will be correct

and i notice the pump have some issues to pump if the tanks runs low

See: viewtopic.php?f=11&t=45863, the actual throughput is reduced by the pressure drop of the connected entities I assume.

hmm i have pipes infront and after the the pump i think the max of pipes is 1800/s i test again with direct trank connection

ok you are right my testsetup was limited by the pipe, with a direct tank connection its 12.000/s so its "not a bug" a tooltip for pipes will be nice