Cableflow tubular cable drag conveyors are suitable for handling friable materials. They operate with reduced clearances and run at reduced speeds. In addition, these conveyors operate in multiple planes and provide totally enclosed, dust- and contamination-free, gentle handling of delicate materials. An optional DART (Dynamic Automatic Rope Tensioner) rope tensioning system maximizes rope life and minimizes manual maintenance. Cable discs are manufactured from ultra high molecular weight polyethylene (UHMWP) and are suitable for temperatures up to 176 degrees F.