There is indeed a conflict. In the Hydrogen Power Systems mod he changes the properties of the default centrifuge to allow it to have a fluid connection. The fundamental reason why our mods conflict is because the HPS mod maker changes the properties of a default item, I then clone that default item and extend its properties to make it bigger, except that when I do that there is now a fluid box that shouldn't exist.
There are numerous ways to fix this, I opted to just explicitly declare that my bulk centrifuge doesn't have a fluid box. In reality though, expect HPS to conflict with a lot of mods because of the mod maker changing base-game items. That's a no-no in general, you want to make a copy of the item and create a new version specific to your mod. The new version will be available in a few seconds.
