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Line Breaking Permit Generator

OSHA defines line breaking as intentionally opening a pipe, line or duct that is or has been carrying flammable, corrosive or toxic material, an inert gas, or any fluid at a volume, pressure or temperature capable of causing injury. That is one sentence and a whole class of accidents. This permit records which line, what was in it, how it was isolated, how it was drained and verified, who wears what, and who signed. Nothing you type is sent to our servers.

A locked-out line is not an empty line. Lockout stops the pump. It does not drain the pipe, relieve trapped pressure, or clear the liquid that sat in a low point since the last turnaround. Every field below exists because someone opened a flange believing the valve upstream was enough.

Most plants limit a line break permit to one shift and one break.
"Has been carrying" is part of the federal definition: what the line held last matters as much as what it holds now.
Hazards of the contents

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Template for informational purposes only. This document must be reviewed and adapted by a competent or qualified person for your specific jobsite, equipment, and applicable federal, state, and local requirements. It does not constitute legal, engineering, or safety advice and does not by itself establish compliance with OSHA or any other standard. SteelToeTools assumes no liability for its use. Nothing you type is sent to our servers.

How to use this permit

  1. 1
    Write down what the line held, not just what it holds. The federal definition says "is or has been carrying". Caustic that has been water-flushed still leaves a film; a hydrocarbon line that has been steamed still has sludge in the low points; a nitrogen line has no smell and no colour and will still kill you in a pit.
  2. 2
    Pick an isolation method from the list, then list every point. Blank or blind, section removed, double block and bleed, energy isolation, mechanical linkage blocked. Then write out each valve and each blind, who set it and who checked it. That list is the permit's whole value six hours later, when someone else has to put the line back.
  3. 3
    Verify at the break, with a gauge you can see. A control room screen tells you what a transmitter thinks. Zero on a local gauge at the joint, and a bleed that runs dry and stays dry, is evidence. 1910.147(d)(6) requires that verification before work starts, and a line break is the case where it is most often skipped.
  4. 4
    Decide the companion permits before the wrench comes out. Cutting or grinding means a hot work permit. Anyone stepping into the space means a confined space entry permit and an attendant. A trench next to the flange means the atmosphere gets tested there too.
  5. 5
    Break the joint out of the line of release. Loosen the far bolts first, keep faces out of the spray path, and have containment ready before the gasket moves. The permit records the position because it is a decision, not a reflex.
  6. 6
    Close the permit against the blind list. Blinds out, count matching the list, joint torqued, leak-checked, locks removed with the release checks of 1910.147(e), and a signature. An open blind list is how a line goes back into service blocked.

What OSHA requires — and where the line break rules actually live

There is no OSHA standard called "line breaking". What exists is a definition and a duty. The definition sits in the confined space standard, 29 CFR 1910.146(b), and it is unusually plain: line breaking means the intentional opening of a pipe, line, or duct that is or has been carrying flammable, corrosive, or toxic material, an inert gas, or any fluid at a volume, pressure, or temperature capable of causing injury. The duty sits in process safety management, 1910.119(f)(4), which tells employers with a covered process to develop and implement safe work practices for hazard control during operations such as lockout/tagout, confined space entry, and opening process equipment or piping — and says those practices apply to contract employees as well as their own.

Everything else a line break needs is borrowed from standards that were written for other things, which is exactly why a written permit earns its place: it is the only document that puts them in one order.

The paragraphs a line break is actually governed by
RequirementSource
Federal definition of line breaking — "is or has been carrying", and any fluid at a volume, pressure or temperature capable of causing injury1910.146(b)
Isolation means blanking or blinding, misaligning or removing a section, a double block and bleed system, lockout or tagout of all energy sources, or blocking or disconnecting mechanical linkages1910.146(b), "isolation"
A blank or blind is a solid plate that completely covers the bore and can withstand the maximum pressure of the line with no leakage beyond the plate1910.146(b), "blanking or blinding"
A double block and bleed is two in-line valves closed and locked or tagged, with a drain or vent valve between them opened and locked or tagged1910.146(b), "double block and bleed"
Employers with a PSM-covered process must develop and implement safe work practices for opening process equipment or piping, applicable to employees and contract employees1910.119(f)(4), (h)(2)(iv), (h)(3)(iv)
Hot work on or near a covered process requires a hot work permit documenting the 1910.252(a) fire prevention requirements, the authorized dates, and the object worked on1910.119(k)
Before hot work on used drums, barrels, tanks or other containers, any pipe lines or connections must be disconnected or blanked, and hollow spaces vented before preheating, cutting or welding1910.252(a)(3)(i)-(ii)
Energy control follows a fixed sequence: knowledge of the energy, orderly shutdown, isolation, lockout or tagout device application, relief of stored and residual energy, then verification of isolation before work starts1910.147(d)(1)-(6)
Before locks come off: the work area is inspected, non-essential items removed, components intact, everyone safely positioned or removed, and affected employees notified1910.147(e)(1)-(2)
Entry into a space where a line break has occurred or could occur is permit-required confined space entry, with isolation as part of the program and an entry permit identifying the hazards and the isolation measures used1910.146(d)(3)(iii), (f)(7)-(8)
PPE is selected from a written workplace hazard assessment, certified with the workplace, the person certifying, the date and the words "certification of hazard assessment"1910.132(d)(1)-(2)
A respirator worn on the job requires a written program, a medical evaluation before use, and fit testing for tight-fitting facepieces1910.134(c), (e), (f)
Where employees may be exposed to injurious corrosive materials, suitable facilities for quick drenching or flushing of the eyes and body must be within the work area for immediate emergency use1910.151(c)
Employees who will respond to an uncontrolled release rather than evacuate must be trained to the level their role requires, from awareness through hazmat technician1910.120(q)(6)

Piping design, gasket and bolting selection, torque values and pressure testing come from the piping code your plant was built to — the ASME B31 series — and from your mechanical integrity program under 1910.119(j). Those are named here and not reproduced: they are copyrighted, and the numbers are specific to your line class. NFPA 51B covers the fire-watch practice behind the hot work rules and is likewise named, not quoted.

Frequently asked questions

There is no paragraph named "line breaking permit" in 29 CFR. What OSHA does is define line breaking in 1910.146(b) and then require, in 1910.119(f)(4), that employers with a process covered by process safety management develop and implement safe work practices for "opening process equipment or piping". A written permit is how nearly every plant meets that. Outside a PSM-covered process, the duties come from lockout/tagout, respiratory protection, PPE and the general duty clause — and a permit is still how you show the work was planned.

Lockout controls energy at an isolating device so a machine cannot start. Line breaking controls the contents of a pipe once you cut into it. They overlap and neither replaces the other: you lock the valves and the pump driver under 1910.147, and you also have to drain, depressurize, flush and prove the line is empty before the flange comes apart. A line locked out is not a line that is empty.

1910.146(b) names the recognized methods: blanking or blinding — a solid plate covering the bore, able to hold the maximum pressure of the line with no leakage past it; misaligning or removing a section of the line; a double block and bleed, meaning two in-line valves closed and locked or tagged with a drain or vent valve opened and locked or tagged between them; lockout or tagout of the energy sources; and blocking or disconnecting mechanical linkages. A single closed valve is not on that list, and it is the most common shortcut in the incident reports.

If anything on the job can ignite — cutting, burning, grinding, welding — yes. 1910.146(b) defines a hot work permit as the employer's written authorization for operations capable of providing a source of ignition, and 1910.119(k) requires one for hot work on or near a PSM-covered process, documenting the 1910.252(a) fire precautions. There is also a specific rule that catches line work: under 1910.252(a)(3)(i), before hot work on a used drum, tank or vessel, any pipe lines or connections to it must be disconnected or blanked.

It can, in two ways. If people enter a space where a line break has occurred or could occur, that space is a permit-required confined space and 1910.146 applies in full, including the entry permit of 1910.146(f). And a line break outside a space can create an atmosphere problem in a pit, sump or trench next to it. Test the atmosphere where people will stand, not only where the flange is.

This template provides four lines: the person doing the work, the operations or process owner who confirms the line is out of service and isolated, the person authorizing the permit, and a close-out signature when the line is reinstated and returned to service. Sites with a permit-to-work system usually add the area authority and the receiving contractor's supervisor. Add the lines your program needs before you issue it.

There is no federal duration. Because the isolation can drift — a valve gets cracked open, a blind gets pulled, a line refills — most plants limit a line break permit to one shift and one break, which is why the form asks for a start and an expiry time and for the reinstatement sign-off. Re-issue instead of extending.

No. The permit is built in your browser and the PDF is generated on your device. A draft stays in this browser until you clear it.

Sources & references

Content checked against these sources — last reviewed September 9, 2026.

By — Editorial team of SteelToeTools.com (published by LSEA SAS) Updated v1