Lockout/Tagout Energy Isolation Trainer

Isolate Hazard Energy

Identify every energy source, isolate and lock each one, then verify before entering the danger zone.

Live Readouts

Residual voltage

0 V

Residual pressure

0 psi

Stored fall energy

0 J

Elapsed time

0.0 s

Near-misses

Isolations verified

How it works

Lockout/Tagout (LOTO) is the standard procedure for making a machine safe before maintenance: identify every hazardous energy source, isolate it, apply a lock and tag, then verify a true zero-energy state before anyone enters the danger zone. This trainer models three real energy sources with their own physics:

Electrical (capacitor bank):  V(t) = V0 · e^(-t/τ_e)   — decays only after the breaker is opened
Pneumatic (accumulator):      P(t) = P0 · e^(-t/τ_p)   — decays only after the bleed valve is opened
Mechanical (suspended mass):  PE = m·g·h                — a fall hazard that never "decays"; it is
                                                             made safe only by a physical restraint block

Isolate Electrical — opens the breaker; stored charge then bleeds off exponentially with time constant τ_e instead of vanishing instantly, exactly like a real capacitor bank.
Isolate Pneumatic — opens the bleed valve; trapped line pressure decays exponentially with time constant τ_p.
Install Mechanical Block — a suspended mass keeps its full potential energy m·g·h forever (energy is conserved); the hazard is removed only by physically blocking the fall path, not by waiting.
Verify & Enter — only succeeds once voltage < 50 V (IEC touch-safe threshold), pressure < 5 psi, and the mechanical block is installed. Entering too early counts as a near-miss.
New Scenario — randomizes the starting voltage, pressure, decay time constants and drop height, so no two runs isolate at the same rate.

Real-world relevance: this three-source model (stored electrical charge, trapped pneumatic/hydraulic pressure, and gravity-held mass) covers the majority of fatal "unexpected energization" incidents that OSHA's LOTO standard (29 CFR 1910.147) exists to prevent.

Energized / hazard Isolated / safe

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