A permit to work (PTW) is a formal, documented authorization that allows a specific high-risk job to be carried out on specific equipment, at a specific time, under specified precautions, by named people. It is not a piece of admin: the permit is a structured conversation between the people who control the plant and the people doing the work, forcing both sides to confirm the hazards and controls before work starts.
Routine, low-risk work runs on normal work orders. A permit system takes over when the work itself creates serious hazards or removes normal safeguards: introducing ignition sources into areas with flammables, entering vessels, breaking into live process lines, or working where multiple crews could endanger each other. Each site defines its permit-required activities explicitly, so there is no judgment call at the moment of the job.
A mid-size plant issues 40 permits per week. Preparing and authorizing each takes an average of 20 minutes of issuer time, and handback plus closure another 10 minutes: 30 minutes per permit, or 20 hours per week, roughly half a full-time role just administering permits. If each permit also delays job start by 15 minutes of crew waiting time for a 2-person crew, that is another 20 crew-hours per week. Numbers like these do not argue for fewer controls; they argue for planning permit-required work deliberately (grouping jobs under one isolation, pre-planning recurring permits) so protection time is spent once, not repeatedly. Realistic estimates also stop schedulers from quietly eroding wrench time expectations.
These three systems answer different questions. LOTO makes the equipment safe to touch. PTW authorizes the specific job and its wider precautions. Management of change reviews whether a modification should happen at all. A vessel repair may involve all three: an MOC for the design change, a permit for the confined space entry and hot work, and lockout of every energy source, informed by a HAZOP-derived understanding of the process hazards.
Permits fail on stale information: the permit says the line is isolated, reality says the isolation moved yesterday. The antidote is keeping permits tied to the same system that runs the work. When jobs live in a CMMS with a clear work order process, planners can flag permit-required job types in advance, attach the current procedure, and keep the full audit trail on the asset. Dedicated permit to work software adds electronic authorization flows on top. Fabrico provides the operational core: work orders, asset histories, and real-time equipment status, so the people issuing permits see what is actually running and what is actually stopped.
Only named, trained, and formally appointed authorized persons, typically area owners or senior operations staff who control the plant. The performing worker and the authorizer should never be the same person; the split of duties is the point of the system.
For the stated job and validity window only, commonly a single shift. If the work runs longer, the permit is revalidated or reissued so changed conditions get reassessed rather than assumed away.
No. A work order says what work should be done and tracks its execution. A permit says this specific high-risk work may proceed now, under these controls. Permit-required jobs need both, and they should reference each other.
Give permit issuers a live view of equipment status and a complete work order trail. Book a Fabrico demo.
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