Asphalt, Road Materials & Paving Products worked example

Drum Dryer Asphalt Capacity at 63% dryer operating uptime: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop dryer operating uptime to 63%, then walk the calculation through step by step. Estimate usable drum dryer capacity from tons per dryer cycle, available cycles, dryer uptime, and dry aggregate yield.

The inputs for this scenario

  • Aggregate tons dried per cycle: 18 tons / cycle (held at the documented default)
  • Available dryer cycles in the period: 90 cycles (held at the documented default)
  • Dryer operating uptime: 63 % (the input this scenario stresses; the baseline uses 88)
  • Dry aggregate yield (moisture-passing): 96 % (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Gross dryer capacity = aggregate tons dried per cycle × available dryer cycles.
  • Usable drum dryer capacity works out to 980 tons at these inputs, and this is the headline figure for the scenario.
  • Gross dryer capacity works out to 1,620 tons at these inputs.
  • Tons lost to dryer downtime works out to 599 tons at these inputs.
  • Tons lost to moisture/rejects works out to 40.82 tons at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where dryer operating uptime sits at 88% and the headline result is 1,369 tons, this scenario comes in 28.41% below the baseline at 980 tons.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to dryer operating uptime, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It treats uptime and yield as flat averages; on a high-moisture aggregate day the dryer burner can become heat-limited, dropping real throughput below this estimate regardless of cycle count.

Results at a glance

  • Usable drum dryer capacity: 980 tons (headline result)
  • Gross dryer capacity: 1,620 tons
  • Tons lost to dryer downtime: 599 tons
  • Tons lost to moisture/rejects: 40.82 tons

Run it with your numbers

  • To rerun this with your own numbers, open the live Drum Dryer Asphalt Capacity calculator, set dryer operating uptime to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.