Most lockout tagout incidents don't happen because a plant has no LOTO procedure, they happen because a step in the procedure got skipped under pressure, a machine restarted for a "quick check", or a lock got removed by someone who wasn't the one who applied it. In a steel plant, with rolling mills, cranes, furnaces and hydraulic presses running in the same shift, one skipped isolation step is the difference between a routine repair and a fatality. Sign up to run every LOTO procedure as a digital checklist tied to the asset, or book a demo to see it on your isolation points.
Why It Matters
LOTO exists for one reason, to make sure the person working inside or on a machine is the only person who controls whether it can move. A lock without a verified zero-energy check is a false sense of safety. A tag without a physical lock is a suggestion, not a control. The checklist is what turns intent into a repeatable, provable process.
The Six Steps Of A LOTO Procedure
Prepare: authorized employee identifies all energy sources for the machine and reviews the specific isolation procedure for it
Notify: affected employees are told the machine is being shut down and isolated before any work starts
Shut down: machine is stopped using its normal operating controls before any isolation device is touched
Isolate: every energy-isolating device is operated so the machine is disconnected from all its energy sources
Lock and tag: each authorized employee applies their own personal lock and tag to every isolation point they're working on
Verify zero energy: stored energy is released and a try-start or meter check confirms the machine cannot move before work begins
Energy Sources A Steel Plant Has To Isolate
Electrical
Breakers racked out and locked, capacitors discharged, voltage confirmed absent with a tested meter
Hydraulic
Pressure bled off through a rated relief point, gauges checked down to zero before line work starts
Pneumatic
Air supply isolated and the line vented, cylinders confirmed unable to extend or retract
Mechanical
Suspended loads blocked or lowered, flywheels and rollers physically restrained against rotation
Thermal
Furnace and ladle surfaces allowed to cool to a safe working temperature before access
Gravity
Elevated components chocked, blocked or pinned so stored potential energy cannot release
Stop Running LOTO Off Paper Permits
OxMaint turns every LOTO procedure into a digital checklist tied to the machine, records who locked out, who verified zero energy, and who authorized release. Sign up for a free trial to load your isolation points, or book a demo to see it built around your plant.
Never Proceed If Any Of These Are True
A try-start or meter check has not been performed after isolation and before work begins
A lock on the isolation point does not belong to a worker currently on the job
A tag is present without a corresponding physical lock on the same isolation device
Stored energy, hydraulic, pneumatic or gravitational, has not been confirmed released
Common LOTO Failure, Root Cause & Fix
| Failure Observed |
Root Cause |
Corrective Fix |
| Machine restarts during work |
Zero-energy verification skipped or incomplete |
Re-isolate, enforce mandatory try-start before every job |
| Lock removed by another worker |
No personal lock discipline or unclear ownership |
Enforce one lock per authorized employee, formal removal procedure only |
| Residual hydraulic pressure found |
Relief step skipped or gauge not checked |
Bleed to a verified rated relief point, confirm gauge at zero |
| Untrained worker applies LOTO |
Authorization list not enforced at the isolation point |
Restrict lockout to listed authorized employees only, verify at permit stage |
The Takeaway
LOTO fails one skipped step at a time, not in one dramatic mistake. The checklist isn't paperwork for its own sake, it's the thing that catches the shortcut before the machine does. Isolate every source, lock it personally, verify it's dead, and don't hand the release authority to anyone but the person who did the work.
Frequently Asked Questions
Q
Who is allowed to remove a lock from an isolation point?
Only the authorized employee who applied the lock should remove it. If that person is unavailable, removal has to follow a documented procedure, usually involving a supervisor confirming the worker is safe and away from the equipment before the lock comes off.
Q
What's the difference between lockout and tagout?
Lockout physically prevents an energy-isolating device from being operated, using a lock the worker controls. Tagout is a warning label attached to the device stating it should not be operated, but it doesn't physically stop anyone from doing so. Tagout alone is only used where a device genuinely cannot be locked out.
Q
Why does LOTO still need zero-energy verification if the machine is already locked out?
A lock only proves the isolating device can't be switched back on, it doesn't prove the isolation was applied correctly in the first place. Stored energy in a capacitor, a raised load, or a pressurized line can still be present after a switch is locked, which is exactly what a try-start or meter check is there to catch.
Make Every LOTO Procedure A Verified, Auditable Record
OxMaint attaches every isolation, lock, zero-energy verification and release to the machine's own record, with authorized employee tracking built in. Sign up for a free trial to load your isolation points, or book a demo to see it configured for your plant.
