How do you calculate silo refill frequency capacity?

Multiply tons per cycle by available cycles for gross capacity, then multiply by uptime and yield. With 18 tons/cycle over 240 cycles, gross is 4,320 tons; at 90% uptime and 96% yield, effective output is 3,732.48 tons.

What is a good silo uptime?

Well-maintained silo feeders run 90% to 97% availability. The 90% default here implies feeder stoppages, bridging, or rat-holing cost about 432 tons in the example, which is on the high side and worth investigating.

Why subtract first-pass yield from silo output?

Material that arrives off-spec, segregated, or contaminated cannot be used as-is. The 96% yield in the example removes 155.52 tons of unusable product so the effective figure reflects what downstream really receives.

How does this help set refill frequency?

Knowing the silo effectively delivers 3,732 tons rather than the gross 4,320 lets you schedule the next refill before downstream starves, instead of trusting the optimistic capacity figure.

Gross capacity vs effective capacity for a silo?

Gross capacity, 4,320 tons here, is the theoretical output if nothing went wrong. Effective capacity, 3,732.48 tons, is what you actually get after uptime and yield losses, and it is the number to plan against.

How do I increase effective silo output?

Cut bridging and rat-holing with mass-flow geometry or aeration to raise uptime, and tighten upstream quality control to lift first-pass yield, since both multiply directly into the effective figure.

Bulk Solids, Mining, Aggregates & Material Processing calculator

Silo Refill Frequency Calculator

Silo Refill Frequency estimates the effective tonnage a storage silo can actually deliver over a period once uptime and yield losses are stripped out of its theoretical throughput. Process engineers and supply planners in cement, aggregate, and bulk-solids plants use it to set refill schedules and avoid both starving downstream equipment and overfilling. Gross capacity assumes a silo and its feeder run flawlessly; in reality, feeder stoppages and off-spec material both cut into deliverable tonnage. This calculator converts the optimistic gross number into a realistic effective figure you can plan refills around.

What this calculator does

Estimate silo refill frequency for silo refill frequency for bulk solids, mining, aggregates, and material processing using plant-floor material, production, quality, capacity, or cost inputs.
a plant team is reviewing silo refill frequency for bulk solids, mining, aggregates, and material processing and needs a clear silo refill frequency for production, quality, capacity, maintenance, purchasing, or costing decisions
It computes effective deliverable tonnage by multiplying per-cycle output and available cycles to get gross capacity, then derating for uptime and first-pass yield.

Formula used

Gross silo refill frequency = silo refill frequency output per cycle × available silo refill frequency cycles
Silo Refill Frequency = gross capacity × uptime × yield

Inputs explained

Tons discharged per silo draw-down cycle:
Draw-down cycles available in the period:
Silo and feeder availability:
First-pass yield of discharged material:

How to use the result

Use it when planning silo refill schedules, sizing storage against demand, or estimating how much usable material a silo will supply over a shift, day, or week.
It assumes uptime and yield are independent and constant, so a silo with correlated feeder jams and quality excursions may deliver less than the model predicts.

Common questions

How do you calculate silo refill frequency capacity? Multiply tons per cycle by available cycles for gross capacity, then multiply by uptime and yield. With 18 tons/cycle over 240 cycles, gross is 4,320 tons; at 90% uptime and 96% yield, effective output is 3,732.48 tons.
What is a good silo uptime? Well-maintained silo feeders run 90% to 97% availability. The 90% default here implies feeder stoppages, bridging, or rat-holing cost about 432 tons in the example, which is on the high side and worth investigating.
Why subtract first-pass yield from silo output? Material that arrives off-spec, segregated, or contaminated cannot be used as-is. The 96% yield in the example removes 155.52 tons of unusable product so the effective figure reflects what downstream really receives.
How does this help set refill frequency? Knowing the silo effectively delivers 3,732 tons rather than the gross 4,320 lets you schedule the next refill before downstream starves, instead of trusting the optimistic capacity figure.
Gross capacity vs effective capacity for a silo? Gross capacity, 4,320 tons here, is the theoretical output if nothing went wrong. Effective capacity, 3,732.48 tons, is what you actually get after uptime and yield losses, and it is the number to plan against.

Last reviewed 2026-05-12.