Bulk Solids, Mining, Aggregates & Material Processing worked example

Screw Conveyor Throughput at 99% screw conveyor running uptime: a worked example

What does the result look like when screw conveyor running uptime reaches 99%? The full calculation is worked below with real intermediate numbers. a plant team is reviewing screw conveyor throughput for bulk solids, mining, aggregates, and material processing and needs a clear screw conveyor throughput for production, quality, capacity, maintenance, purchasing, or costing decisions

The inputs for this scenario

  • Tonnage per screw fill cycle: 18 tons / cycle (unchanged)
  • Screw fill cycles available: 240 cycles (unchanged)
  • Screw conveyor running uptime: 99 % (raised for this scenario; the documented default is 90)
  • On-spec discharge yield: 96 % (unchanged)

Working through the calculation

  • Applying the documented formula (Gross screw conveyor throughput = screw conveyor throughput output per cycle × available screw conveyor throughput cycles) to the inputs above produces each figure below.
  • At this operating point the engine returns 4,106 tons for screw conveyor throughput, the number this scenario is built around.
  • At this operating point the engine returns 4,320 tons for gross screw conveyor throughput.
  • At this operating point the engine returns 43.2 tons for screw conveyor throughput uptime loss.
  • At this operating point the engine returns 171 tons for screw conveyor throughput yield loss.

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 10% above the baseline at 4,106 tons.
  • A figure at this level is achievable when screw conveyor running uptime is genuinely sustained, not just peaked for a shift. 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: 4,106 tons (headline result)
  • Gross screw conveyor throughput: 4,320 tons
  • Screw Conveyor Throughput uptime loss: 43.2 tons
  • Screw Conveyor Throughput yield loss: 171 tons

Run it with your numbers

  • Every input above is editable in the live Screw Conveyor Throughput calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.