There are 6 types of Waterproof Pipes: Wooden, Cobblestone, Stone, Iron, Gold and Redstone. Waterproof pipes are made from normal pipes by adding Pipe Waterproof. Waterproof pipes can transport Water, Lava, Oil, and Fuel.
In addition, Mining Pipe is a pipe that can be used as any kind of pipe.
Pipe placement is important. If you want to remove items from a furnace, for example, then a wooden pipe needs to be attached to the side of the furnace. A pipe connected to the top of a furnace places items into the top spot, and a pipe connected to the bottom of a furnace puts items into the bottom spot. If this is glitchy, wait for the power (any source) to, in a way, heat up
If you connect pipes in a loop, the world/server may deteriate.