Pipe maybe standard in some countries, but not in others. Most often electric reistance welded (ERW) tubing is used. This has a more accurate TIR and balance measure than pipe.

Pipe is for slow conveyors. It comes with more mishapen diameters, varying wall thickness, more run-out or banana shape and higher imbalance. Not good for belts running above 4 m/s, idlers with greater than 500 rpm, and roll diameters less than 152 mm. Even at these limits pipe has questionable use. But, its cheap.

You should have a third selection for ERW tubing. Even then, for high speed conveyors further refinement is required.

Plastic has its place. ■