- 1 · Live
- 2 · Effort
- 3 · Pass
- 4 · Fail
We built a lock-out/tag-out trainer on a pressurised line, where valves take sustained effort and spring back if released early, and the line only bleeds down once both ends are shut. Unsafe acts are recorded as faults instead of being prevented. A trainee can therefore complete every step of the procedure and still fail it.
What we measured
| Measure | Result | Note |
|---|---|---|
| Valve travel, sustained effort | 1.62 s | |
| Spring-back from half-turned to open | 0.45 s | |
| Bleed-down, 5.98 bar to the 0.2 bar safe mark | 4.28 s | |
| Correct run | 5/5 steps, passes | 7.6 s end to end in the browser |
| Locked a live line | 5/5 steps, fails | |
| Recorded a false verification | 5/5 steps, fails | |
| Skipped the lock | 4/5 steps, fails |
What happens next
- Add an alarm and a detent click; the panel currently has no audio, which costs more in feel than anything visual would.
- Confirm the spoken confirmation path with a real microphone; we could only verify the fallback.
- Try the reach, gaze and speech version in a headset, not only the button page.
The book behind the lab
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