Airway Resistance — Ventilation Raise (Bored)
Atkinson resistance and frictional pressure loss for a ventilation raise (bored) at its design airflow.
Raise-bored holes are hydraulically beautiful — circular, smooth, k near shaft-lining values. Their danger is velocity: 70 m³/s through 7 m² is 10 m/s, beyond the comfort of any ladderway sharing the excavation. Dedicated airways stay dedicated.
Formula
Note: Mine ventilation is statutory and life-safety territory: airflow quantities, gas limits and re-entry times must be set by the registered ventilation engineer/manager under your jurisdiction's mining regulations — this calculator is a planning and training aid.
Disclaimer: This tool is for general informational and estimation purposes only and is not professional financial, tax, accounting or legal advice. All figures are estimates — verify with a qualified professional before making decisions. Read the full disclaimer.
Atkinson resistance and frictional pressure loss for a ventilation raise (bored) at its design airflow. A free mine ventilation & air quality tool — no sign-up, no upload, instant results in your browser.
About Airway Resistance — Ventilation Raise (Bored)
Airway Resistance — Ventilation Raise (Bored) computes the governing relationship R = k·P·L/A³ · p = R·Q² [Atkinson] live as you type. Raise-bored holes are hydraulically beautiful — circular, smooth, k near shaft-lining values. Their danger is velocity: 70 m³/s through 7 m² is 10 m/s, beyond the comfort of any ladderway sharing the excavation. Dedicated airways stay dedicated. Defaults are pre-filled with realistic values for this exact scenario, and the worked example substitutes your numbers step by step so the math is never a black box.
How to use Airway Resistance — Ventilation Raise (Bored)
- 1Enter your values — Friction factor k, Airway length, Cross-section area, Perimeter and more (sensible defaults are pre-filled).
- 2Read the live results: Resistance R, Pressure loss, Air velocity.
- 3Check the "with your numbers" line to see R = k·P·L/A³ · p = R·Q² [Atkinson] substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Airway Resistance — Ventilation Raise (Bored)?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula R = k·P·L/A³ · p = R·Q² [Atkinson] with authoritative sources cited on the page (McPherson, M.J., Subsurface Ventilation and Environmental Engineering; Hartman et al., Mine Ventilation and Air Conditioning, 3rd ed.)
- ✓Raise-bored holes are hydraulically beautiful — circular, smooth, k near shaft-lining values.
- ✓SI ⇄ Imperial toggle converts your inputs in place, so you can work in the units your drawings use
Frequently asked questions
What formula does the airway resistance — ventilation raise (bored) use?+
It evaluates R = k·P·L/A³ · p = R·Q² [Atkinson], exactly as published. Sources: McPherson, M.J., Subsurface Ventilation and Environmental Engineering; Hartman et al., Mine Ventilation and Air Conditioning, 3rd ed.. The substituted worked example on the page lets you verify every step against the textbook.
How should I read the result — and how far can I trust it?+
Raise-bored holes are hydraulically beautiful — circular, smooth, k near shaft-lining values. Mine ventilation is statutory and life-safety territory: airflow quantities, gas limits and re-entry times must be set by the registered ventilation engineer/manager under your jurisdiction's mining regulations — this calculator is a planning and training aid.
When is this calculator the right tool for the job?+
Atkinson resistance and frictional pressure loss for a ventilation raise (bored) at its design airflow. A free mine ventilation & air quality tool. Their danger is velocity: 70 m³/s through 7 m² is 10 m/s, beyond the comfort of any ladderway sharing the excavation. For neighbouring scenarios, the related tools below cover the same engine with different presets.
Does it support both metric and imperial units?+
Yes — the SI ⇄ Imperial toggle converts the values already in the fields, preserving the physical quantity, so you can flip mid-calculation without re-entering anything.
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