A hot work permit is a signed form issued before welding or cutting begins. Under OSHA's general industry rule, 29 CFR 1910.252, the person who authorizes the job inspects the area first. That person sets the precautions "preferably in the form of a written permit," and the free template on this page follows the rule's main precautions.
Hot work means "work involving burning, welding, or a similar operation that is capable of initiating fires or explosions," in the words of NFPA's hot work safety fact sheet. The sheet names arc welding, oxy-fuel gas welding, open-flame soldering, brazing, thermal spraying, oxygen cutting and arc cutting. Its broader test is any "activity involving flame, spark production, or heat," so a grinder throwing sparks across a pump room belongs on a permit too.
We suggest a fresh permit for each job and each work location, so the inspection matches the place the sparks will land. The sections below cover when OSHA expects authorization, who signs, how long someone watches after the torch goes out, and the separate rules for drums and tanks that once held fuel.
When is a hot work permit required?
Federal OSHA requires an inspection and an authorization before cutting or welding outside an area set up for it, and it prefers that authorization "in the form of a written permit" without strictly requiring the form. Under 29 CFR 1910.252(a)(2)(xiii), management must establish areas for cutting and welding. It must also designate "an individual responsible for authorizing cutting and welding operations in areas not specifically designed for such processes." Construction crews work under a parallel rule, 29 CFR 1926.352. It never uses the word permit and has no authorization step, but it sets out similar precautions, from moving the work away from fire hazards to keeping extinguishing equipment ready.
The general industry rule also says when the job needs someone posted to watch for fire. Section 1910.252(a)(2)(iii) requires one wherever more than a minor fire could develop, or wherever any of four conditions exist. Appreciable combustible material within 35 feet of the work is the first. Combustibles farther than 35 feet away still count if sparks could easily ignite them. Wall or floor openings within a 35-foot radius that expose combustibles next door, including concealed spaces, are the third, and combustibles on the far side of a metal partition or roof that heat could ignite are the fourth. If none of those apply and only a minor fire is possible, OSHA does not require the extra person, though nothing stops you from posting one.
Where the local fire code adopts NFPA 51B, a documented procedure is expected as well. NFPA's fact sheet notes that NFPA 1, Fire Code, "requires compliance with NFPA 51B in Chapter 41." The same sheet tells building owners and facility managers they "must have a procedure in place for documenting hot work hazards."
Who signs the permit, and who does what?
The authorizing individual signs after walking the area. Under 29 CFR 1910.252(a)(2)(xiii), management names that person. The supervisor must secure authorization "from the designated management representative" and make sure "the cutter or welder secures his approval that conditions are safe before going ahead." NFPA's fact sheet calls the same role the permit authorizing individual.
Under 29 CFR 1910.252(a)(2)(xiv), the supervisor also decides which combustible materials and hazardous areas are present. Those combustibles get protected by moving either the work or the combustibles, or by shielding them in place. The supervisor schedules the job so that plant operations which could expose combustibles do not start while cutting is under way. Fire protection and extinguishing equipment has to be in place at the site. Where a watcher is required, the supervisor sees that one is actually there, which sounds obvious until the person assigned gets pulled onto another task.
Management has one more duty that matters on any contracted job. OSHA's text tells it to "advise all contractors about flammable materials or hazardous conditions of which they may not be aware," and the walk before signing is the natural time to do it. A visiting welding crew cannot see what is stored behind a wall or above a ceiling, so the owner's side of the form carries that knowledge.
How long must a fire watch last after hot work?
OSHA's general industry minimum is 30 minutes. The general industry rule reads: "A fire watch shall be maintained for at least a half hour after completion of welding or cutting operations to detect and extinguish possible smoldering fires." The 2019 edition of NFPA 51B asks for more. According to NFPA's fact sheet, the watch "must remain on site for a minimum of 60 minutes to monitor for smoldering fires." The permit authorizing individual can keep it longer depending on conditions at the site.
OSHA's half hour is the floor wherever the general industry rule applies, and the fire code your fire marshal enforces can lengthen it. Jurisdictions adopt NFPA 51B by edition, some adopt the International Fire Code instead, and the fact sheet itself says it was written for the 2019 edition and tells readers to check with local jurisdictions. NFPA offers free online access to NFPA 51B, so ask the fire marshal which code and edition are in force and write that time on the form before work starts. Construction sites get no fixed number from OSHA at all. Under 29 CFR 1926.352(e), extra personnel stay on guard "for a sufficient period of time after completion of the work to ensure that no possibility of fire exists," which leaves the length to judgment. Where the answer is unclear, 60 minutes satisfies both the OSHA figure and the 2019 NFPA figure.
The person on watch needs extinguishing equipment within reach and training to use it. Watchers must know how to sound the alarm, and they cover every exposed area, including the far side of walls and floors where heat or sparks can travel. 29 CFR 1910.252(a)(2)(iii)(B) tells them to fight a fire only when it is "obviously within the capacity of the equipment available, or otherwise sound the alarm."
Can you weld or cut on a tank that held fuel?
Only after it has been cleaned or filled with water, vented, and tested for flammable vapor. Section 1910.252(a)(3) says no hot work may be done on used tanks and drums until they are cleaned "so thoroughly as to make absolutely certain that there are no flammable materials present," a deliberately high bar. Connected pipe lines must be "disconnected or blanked" before work starts. Hollow spaces and containers must be vented before heat is applied, and the rule recommends purging with inert gas.
Construction work reaches the same place by a slightly different road. Under 29 CFR 1926.352(i), containers or hollow structures that held toxic or flammable substances must "either be filled with water or thoroughly cleaned of such substances and ventilated and tested" before any hot work. Paragraph (j) requires a vent or opening so built-up pressure can escape while heat is applied. A tank's atmosphere is tested with a combustible gas meter, which reports flammable vapor as a percentage of the lower explosive limit (LEL). Write the reading, the meter used, the time and the test location on the form.
A tank that held gasoline, diesel or heating oil is exactly the case OSHA has in mind when it prohibits cutting or welding in explosive atmospheres. The prohibition in 1910.252(a)(2)(vi) names atmospheres "that may develop inside uncleaned or improperly prepared tanks or equipment which have previously contained such materials" as one example. OSHA's phrase "absolutely certain" sets the bar well above a quick reading at the manway. For that reason the safer plan on any tank job is cold cutting after the tank has been emptied and cleaned, with a torch coming out only after a clean atmosphere reading. If cleaning means sending someone inside the tank, that entry is a permit-required confined space question with its own paperwork; the confined space entry permit guide covers it, and our tank cleaning guide covers how tanks are cleaned. The general rule in 1910.252(a)(1)(iii) covers every job, tank or not: when the hazards cannot be moved and cannot be guarded, "welding and cutting shall not be performed."
What goes on a hot work permit form?
Our template has five parts, each tied to the OSHA text: the job and its location, the precautions checklist, the signatures before work, the watch log, and the final sign-off after the watch ends. The job section names the object being cut or welded, the kind of hot work and the hours it covers, so nobody stretches one signature over a second job across the yard.
The checklist follows the precautions in 1910.252(a)(2). Combustibles are moved at least 35 feet away or covered with flameproofed covers or metal guards. Combustible floor debris is swept up for a radius of 35 feet, and combustible floors are kept wet, covered with damp sand or shielded. Wall and floor openings are covered, ducts and conveyors that could carry sparks are protected or shut down, and someone checks the far side of any wall, ceiling or roof being heated. Sprinklers must be working, because the rule bars cutting or welding "in sprinklered buildings while such protection is impaired." Extinguishing equipment is ready "for instant use."
Built from 29 CFR 1910.252 and 1926.352. Check which edition of NFPA 51B your fire marshal enforces. Keep the completed permit with the job records. Template: ustcontractors.com/hot-work-permit/
The watch log is where the permit earns its keep. It records when the hot work stopped, when the watch ended and who checked the area before leaving, and the gap between the first two times shows whether the watch ran its full length. Print the form with the button above it. The print layout drops everything on the page except the form, and choosing Save as PDF in your browser's print dialog gives you a file to send to a crew.
What does a hot work program add beyond the permit?
A hot work program is the written procedure behind the permits: who may authorize, which areas are set aside for hot work, what training people get, and where signed permits are kept. OSHA puts training on management, which must "insist that cutters or welders and their supervisors are suitably trained in the safe operation of their equipment and the safe use of the process."
Keep completed permits with the job records, because a signed permit is the written record that the inspection and the watch happened. The program decides who keeps them and for how long.
Training is the other half. NFPA's fact sheet points readers to its own hot work safety certificate, and it notes that Boston and then Massachusetts adopted certificate requirements for people in certain roles, so check what your city expects before an outside crew starts.
Who handles hot work on a tank removal or closure?
Decide before the job starts whose permit governs. OSHA places authorization with the site's management and the day-to-day precautions with the supervisor, so on a contracted removal or closure the template has a line for each, plus the operator and whoever stands watch. Tank removal can count as construction work, in which case 29 CFR 1926.352 applies instead of 1910.252; the template works under either. If the cut touches the tank shell or its piping, the gas meter reading goes on the form too, with the meter used and the signature of whoever took it.
Tank work that can involve cutting includes closing a tank in place and pulling it out of the ground, and both routes can mean cutting fittings, piping or access openings. Our guides on closure in place and on decommissioning versus removal cover each route. For residential jobs, the oil tank removal hub has a state picker, and the UST contractor directory lists firms that clean, close and remove tanks, state by state.
The number that decides a tank job is the gas meter reading at the opening. If it shows flammable vapor, nothing else on the permit matters until the tank is cleaned and tested again, because 29 CFR 1910.252(a)(2)(vi) bars cutting or welding where an explosive atmosphere may develop inside an uncleaned tank.