Oh yeah, no, the tiny copper pipe was not for 64 RU/t, of course, but enough to make a Bronze Centrifuge run. Sorry my bad for confusing
For 64 RU/t, I think a tiny Bronze pipe would do, but anyway it's really tricky to get to that point and not go over 64 RU/t, where the Bronze Centrifuge will stop working.
Best is to use the Steel Centrifuge and work with it.
64 RU/t is the utmost limit of Tier 1, true, but in GT I've learned that limits are blurred, and that's what's fun with it