Bulk Solids, Mining, Aggregates & Material Processing worked example

Screw Conveyor Throughput at 65% screw conveyor running uptime: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop screw conveyor running uptime to 65%, then walk the calculation through step by step. Estimate screw conveyor throughput for screw conveyor throughput for bulk solids, mining, aggregates, and material processing using plant-floor material, production, quality, capacity, or cost inputs.

The inputs for this scenario

  • Tonnage per screw fill cycle: 18 tons / cycle (held at the documented default)
  • Screw fill cycles available: 240 cycles (held at the documented default)
  • Screw conveyor running uptime: 65 % (the input this scenario stresses; the baseline uses 90)
  • On-spec discharge yield: 96 % (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Gross screw conveyor throughput = screw conveyor throughput output per cycle × available screw conveyor throughput cycles.
  • Screw Conveyor Throughput works out to 2,696 tons at these inputs, and this is the headline figure for the scenario.
  • Gross screw conveyor throughput works out to 4,320 tons at these inputs.
  • Screw Conveyor Throughput uptime loss works out to 1,512 tons at these inputs.
  • Screw Conveyor Throughput yield loss works out to 112 tons at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where screw conveyor running uptime sits at 90% and the headline result is 3,732 tons, this scenario comes in 27.78% below the baseline at 2,696 tons.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to screw conveyor running uptime, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It assumes a consistent fill ratio. Screw conveyors lose throughput fast when overfilled, when material packs at the trough, or when incline reduces effective fill, none of which a single uptime number captures.

Results at a glance

  • Screw Conveyor Throughput: 2,696 tons (headline result)
  • Gross screw conveyor throughput: 4,320 tons
  • Screw Conveyor Throughput uptime loss: 1,512 tons
  • Screw Conveyor Throughput yield loss: 112 tons

Run it with your numbers

  • To rerun this with your own numbers, open the live Screw Conveyor Throughput calculator, set screw conveyor running uptime to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.