What is a hot work permit?

Why the permit exists

Hot work starts fires an hour after the torch is off, in places the welder never looked: insulation behind a wall, dust in a plenum, cardboard on the floor below. The permit forces someone to look before the work starts and to write down what they found. NFPA 51B, the standard most permit systems follow, builds the permit around a permit authorizing individual who inspects the area, sets the precautions and assigns the fire watch; OSHA’s 29 CFR 1910.252 requires the same precautions and the same watch in its own words.

What a permit records

The location and the work. The name of the person authorizing it and the person doing it. The start time and the expiry. The inspection: combustibles within 35 feet moved or covered, floors swept, openings in walls and floors sealed, sprinklers in service or an impairment noted, extinguishers and hose in place. The fire watch: who, where, for how long after the work, and the monitoring period if the authorizing individual requires one. Signatures at issue and at close-out.

Where the fire watch fits

The permit says a watch is required; the watch officer’s log shows it was kept. Price Protection officers on hot-work watches stay where the sparks go, keep extinguishers at hand, keep the area clear, stay for the post-work period the permit sets, at least 30 minutes under OSHA and at least an hour under NFPA 51B, and sign the log that is filed with the permit. Contractors who cannot spare a trained crew member for the watch contract it; the hot work fire watch page explains how.

Using the checklist

The hot work fire watch checklist reproduces the permit’s checks in order, and the OSHA rules article goes through the regulation clause by clause.