What is a Permit to Work (PTW)?

High-hazard work shares one characteristic: its effects are not limited to whoever performs it. Welding creates an ignition source in surroundings that may hold flammable material, excavation can strike buried services, confined space entry endangers whoever attempts a rescue. The permit exists so that someone outside the working crew verifies those surroundings before work starts.

Its second function is preventing overlap. When the site knows welding will take place in a given area between specific hours, other work can be kept out of that area during that window. Without it, each crew is safe on its own and hazardous to the other.

Closure matters as much as issue. A permit left open after the work has finished means the site believes an area is under active work when it is empty — or the reverse, which is worse: work continuing past its window with nobody aware.

On sites running several contractors at once, the permit is the only instrument that sees the whole picture. Each contractor knows its own work; nobody automatically knows what is happening twenty metres away. Scheduled maintenance windows — when a large volume of work is compressed into a few days — are when weaknesses in a permit system show most, because time pressure pushes towards hurried issue and late closure.

• Confined space
• Lockout tagout
• Work at height
• JSA

A permit defines a scope and a time window — which are precisely what can be represented as a zone and a duration in the platform. Activity inside the scope outside the authorised window then becomes a case raised to the team, and every permit gains a visual record of what actually took place within it. Read about the platform.

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