Screen Capacity

Estimate screen capacity from caller area loading and correction factors; no vendor guarantee or calibration applicability is inferred.

Description

Screen capacity estimates often multiply an area-based base rate by correction factors.

Screen capacity estimates often multiply an area-based base rate by correction factors. The factors need to match the material and operating assumptions of that base rate.

The tool returns predictedCapacityTonnesPerHour (predicted capacity tonnes per hour); throughputMarginTonnesPerHour (throughput margin tonnes per hour); meetsRequiredThroughput (meets required throughput). Input measurements and model parameters are supplied by the caller; the tool computes the stated summary rather than acquiring those measurements.

When to use Screen Capacity

Use Screen Capacity when you already have effectiveAreaM2, baseCapacityTonnesPerHourM2, correctionFactors, requiredThroughputTonnesPerHour and want predictedCapacityTonnesPerHour, throughputMarginTonnesPerHour, meetsRequiredThroughput. This is useful for checking a supplied calculation, documenting a measurement convention, or comparing observations prepared on the same basis.

How to use Screen Capacity and understand its results

Enter effectiveAreaM2, baseCapacityTonnesPerHourM2, correctionFactors, requiredThroughputTonnesPerHour using the field table below. Match the units, ordering and data boundaries described in the calculation.
Run the tool after checking the stated bounds and matching paired observations or categories. A malformed request gives a tool error rather than a usable measurement.
Read predictedCapacityTonnesPerHour, throughputMarginTonnesPerHour, meetsRequiredThroughput. Use the calculation and interpretation below to distinguish amounts, ratios, signs and decision flags where applicable.
Review the supplied parameters and assumptions before using the result in a report or comparing it with another observation.

Input field	Meaning	Value type and bounds	Requirement
effectiveAreaM2	Effective area m2	number	Required
baseCapacityTonnesPerHourM2	Base capacity tonnes per hour m2	number	Required
correctionFactors	Correction factors	list of number	Required
requiredThroughputTonnesPerHour	Required throughput tonnes per hour	number	Required

Use positive area, base capacity and a nonempty positive factor list with nonnegative required throughput. Equality meets the requirement.

capacity = area×baseRate×ΠcorrectionFactors; margin = capacity−requiredThroughput

The symbols refer to the supplied quantities or generated values described above; unit conversions and comparison boundaries follow the stated implementation.

json

{
  "input": {
    "effectiveAreaM2": 10,
    "baseCapacityTonnesPerHourM2": 5,
    "correctionFactors": [
      0.8,
      0.5
    ],
    "requiredThroughputTonnesPerHour": 30
  },
  "output": {
    "predictedCapacityTonnesPerHour": 20,
    "throughputMarginTonnesPerHour": -10,
    "meetsRequiredThroughput": false
  }
}

Limitations and assumptions

Factors are supplied, not chosen or fitted. The tool does not predict size-distribution-dependent performance or verify manufacturer ratings.

Numerical inputs must be finite. The tool checks its declared input shape and calculation constraints; those checks do not verify the quality, calibration or representativeness of the supplied observations.

Alternative or Complementary methods

Screen Efficiency: Calculate screen class recoveries and their product from a two-class dry balance; explicitly a recovery product, not undersize purity. Shovel Productivity: Estimate tonnes/pass and scheduled shovel throughput using loose density and fill; no bank/loose conversion is silently assumed.

Methodological background: Surface Mining Technology: stripping ratios and pit layouts.^[1]

References

Surface Mining Technology: stripping ratios and pit layouts — NPTEL, Indian Institute of Technology Kharagpur

Similar or alternative tools

Screen Efficiency
Calculate screen class recoveries and their product from a two-class dry balance; explicitly a recovery product, not undersize purity.
Shovel Productivity
Estimate tonnes/pass and scheduled shovel throughput using loose density and fill; no bank/loose conversion is silently assumed.