TBM Telemetry — Hyperbaric Intervention Planning
Hyperbaric Intervention Planning for tunnel project performance management.
Compressed-air work above ~1 bar trades face access for decompression tables — at 3 bar a worker's useful window shrinks to a couple of hours inside a much longer lock cycle. A 'quick cutter inspection' under pressure is a multi-day, medically-supervised operation; saturation techniques start making sense past 3.5 bar.
Formula
Note: Planning-level tunnelling estimate — actual TBM performance is set by detailed geotechnical baseline data, machine design and the contractor's means & methods. Use for feasibility framing only.
Hyperbaric Intervention Planning for tunnel project performance management. A free tbm performance & tunnelling tool — no sign-up, no upload, instant results in your browser.
About TBM Telemetry — Hyperbaric Intervention Planning
TBM Telemetry — Hyperbaric Intervention Planning computes the governing relationship cycles = work ÷ (window × crew); duration includes decompression overhead live as you type. Compressed-air work above ~1 bar trades face access for decompression tables — at 3 bar a worker's useful window shrinks to a couple of hours inside a much longer lock cycle. A 'quick cutter inspection' under pressure is a multi-day, medically-supervised operation; saturation techniques start making sense past 3.5 bar. 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 TBM Telemetry — Hyperbaric Intervention Planning
- 1Enter your values — Face pressure, Work hours needed at face, Working time per man-lock cycle, Workers per intervention (sensible defaults are pre-filled).
- 2Read the live results: Lock cycles needed, Intervention duration.
- 3Check the "with your numbers" line to see cycles = work ÷ (window × crew); duration includes decompression overhead substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use TBM Telemetry — Hyperbaric Intervention Planning?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula cycles = work ÷ (window × crew); duration includes decompression overhead with authoritative sources cited on the page (Maidl et al., Mechanised Shield Tunnelling, 2nd ed.; ITA/BTS — Mechanised tunnelling guidelines; NTNU prediction model — hard-rock TBM performance)
- ✓Compressed-air work above ~1 bar trades face access for decompression tables — at 3 bar a worker's useful window shrinks to a couple of hours inside a much longer lock cycle.
- ✓Niche-specific defaults give a meaningful worked answer the moment the page loads
Frequently asked questions
What formula does the tbm telemetry — hyperbaric intervention planning use?+
It evaluates cycles = work ÷ (window × crew); duration includes decompression overhead, exactly as published. Sources: Maidl et al., Mechanised Shield Tunnelling, 2nd ed.; ITA/BTS — Mechanised tunnelling guidelines; NTNU prediction model — hard-rock TBM performance. 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?+
Compressed-air work above ~1 bar trades face access for decompression tables — at 3 bar a worker's useful window shrinks to a couple of hours inside a much longer lock cycle. Planning-level tunnelling estimate — actual TBM performance is set by detailed geotechnical baseline data, machine design and the contractor's means & methods. Use for feasibility framing only.
When is this calculator the right tool for the job?+
Hyperbaric Intervention Planning for tunnel project performance management. A free tbm performance & tunnelling tool. A 'quick cutter inspection' under pressure is a multi-day, medically-supervised operation; saturation techniques start making sense past 3.5 bar. For neighbouring scenarios, the related tools below cover the same engine with different presets.
Do I need to install anything or create an account?+
No. The tool is pure client-side JavaScript: open the page and it works, offline once loaded, with no account, no quota and no data leaving your device.
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