The tubular screw conveyor, with flighting welded on shaft, or closed screw conveyor, is defined as such because the housing is a closed pipe to which inlets and outlets are placed to enable the feeding and discharge of the material, as well as any required inspection openings.
This type of equipment is suitable for materials whose handling could be difficult or dangerous. Such as, for example, greater sealing to avoid leakage of dust, odors and even semisolid. But also for installations that have significant working inclinations, being able to work vertically.
The diameter dimensions of this equipment usually come in standard pipe sizes.