Bulk solids handling — short-distance conveying of granular materials For short-distance transport of grain, gravel, sand, ash, or asphalt, which conveyor type is most commonly used?

Introduction / Context:
Choosing a conveyor depends on material properties, distance, incline, and containment needs. For short runs inside plants, a compact, enclosed, and versatile unit is preferred for granular or powdery materials.

Given Data / Assumptions:

• Materials: grain, gravel, sand, ash, asphalt (granular to fine, sometimes hot).
• Short-distance conveying within a facility.
• Desire for enclosed transport to limit dust and spillage.

Concept / Approach:
Screw conveyors are ubiquitous for short distances. They are simple, enclosed, tolerant of a range of bulk densities, allow controlled feeding, and can be inclined modestly. Alternatives like drag (slat) or flight conveyors serve niche layouts but are bulkier or more maintenance-prone for general short-run duties.

Step-by-Step Solution:
Match requirements (short, enclosed, versatile) → screw conveyor.Check material compatibility: screws routinely handle grain, sand, ash, and even warm asphalt with proper materials of construction.Select “screw.”

Verification / Alternative check:
Vendor catalogs list screw conveyors for metering and transfer over spans typically up to 30–40 m per section, ideal for “short distance.”

Why Other Options Are Wrong:

• Flight and slat/drag: workable but often chosen for abrasive, long, or vertical lifts; more complex casing and chain wear.
• Ribbon: a screw variant used to mix/handle sticky materials; not the generic transfer solution.

Common Pitfalls:

• Assuming belt conveyors are always preferred; belts excel at longer distances and higher capacities but are not listed among the options here.

Final Answer:
screw