Emergency — Escape Route Time
Escape Route Time for mine emergency preparedness planning.
Escape planning fails on optimistic walking speeds: 70 m/min on the level becomes 25 in smoke and 15 climbing a return. The honest time from this calculation, compared against SCSR duration in the next tool, decides where cache stations go — the regulation's logic in two numbers.
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.
Escape Route Time for mine emergency preparedness planning. A free mine ventilation & air quality tool — no sign-up, no upload, instant results in your browser.
About Emergency — Escape Route Time
Emergency — Escape Route Time computes the governing relationship t = d / (v × smoke factor × grade factor) live as you type. Escape planning fails on optimistic walking speeds: 70 m/min on the level becomes 25 in smoke and 15 climbing a return. The honest time from this calculation, compared against SCSR duration in the next tool, decides where cache stations go — the regulation's logic in two numbers. 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 Emergency — Escape Route Time
- 1Enter your values — Distance to refuge/surface, Walking speed (clear air), Smoke/visibility factor, Average uphill grade (sensible defaults are pre-filled).
- 2Read the live results: Escape time.
- 3Check the "with your numbers" line to see t = d / (v × smoke factor × grade factor) substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Emergency — Escape Route Time?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula t = d / (v × smoke factor × grade factor) with authoritative sources cited on the page (MSHA 30 CFR Parts 57/75 — Ventilation standards; McPherson, M.J., Subsurface Ventilation and Environmental Engineering)
- ✓Escape planning fails on optimistic walking speeds: 70 m/min on the level becomes 25 in smoke and 15 climbing a return.
- ✓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 emergency — escape route time use?+
It evaluates t = d / (v × smoke factor × grade factor), exactly as published. Sources: MSHA 30 CFR Parts 57/75 — Ventilation standards; McPherson, M.J., Subsurface Ventilation and Environmental Engineering. 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?+
Escape planning fails on optimistic walking speeds: 70 m/min on the level becomes 25 in smoke and 15 climbing a return. 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?+
Escape Route Time for mine emergency preparedness planning. A free mine ventilation & air quality tool. The honest time from this calculation, compared against SCSR duration in the next tool, decides where cache stations go — the regulation's logic in two numbers. 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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