Confined Space Entry Permits Explained (What Goes on the Form)
If your facility has a written confined space program but your entry permits are blank, half-completed, or filled out after the fact, the program isn't doing what it's supposed to do.
If your facility has a written confined space program but your entry permits are blank, half-completed, or filled out after the fact, the program isn’t doing what it’s supposed to do. The permit is the operating document. It’s the record that proves a specific entry, on a specific date, by specific people, was authorized after the hazards were controlled.
A binder full of program text doesn’t satisfy Cal/OSHA. A signed, complete entry permit, on the right form, for each permit-required entry, does.
This piece walks through what goes on a confined space entry permit and why each field matters. For the full overview of the program the permit sits inside, see our California confined space program guide.
What an Entry Permit Is (and What It Isn’t)
A confined space entry permit is a single-use, single-entry document that authorizes one team to enter one permit-required space for a defined period of time under defined conditions. It is not the written program. It is not a training certificate. It is not an annual document.
The permit is filled out and signed by the entry supervisor before entry begins. Once entry is complete (or conditions change), the permit is canceled. Canceled permits are kept on file. Cal/OSHA Title 8 §5157 requires this documentation, and §5157(f) specifies the content the form must capture.
The Fields on a Confined Space Entry Permit
Permit forms vary by facility, but Cal/OSHA §5157(f) requires the same content regardless of layout. When we review a client’s existing permits during a program audit, this is what we check for.
| # | Field | What goes here | Why it’s on the form |
|---|---|---|---|
| 1 | Permit space identification | Specific name and location of the space (e.g., “South tank farm, Tank T-104”) | Identifies exactly which space is being entered. A “generic” permit covering “any tank” is not a valid permit. |
| 2 | Purpose of entry | The task being performed (cleaning, inspection, repair, sampling) | Different tasks introduce different hazards. Hot work changes the hazard profile entirely. |
| 3 | Date and authorized duration | Start date and time; end date and time | Permits are good for one entry, one shift, or one defined task. Open-ended permits are not compliant. |
| 4 | Authorized entrants | Names of every employee approved to enter | Only listed personnel may enter. Unlisted employees entering the space is a documented deficiency Cal/OSHA looks for. |
| 5 | Attendants | Name(s) of the attendant(s) posted outside | At least one attendant must remain outside during the entry. The attendant cannot leave the post. |
| 6 | Entry supervisor | Name and signature of the supervisor authorizing the entry | The supervisor verifies hazards are controlled before signing. This is the legal authorization. |
| 7 | Hazards of the space | All recognized hazards: atmospheric, engulfment, configuration, mechanical, electrical, thermal, biological | Listing the hazards forces the team to plan controls for each one. |
| 8 | Acceptable entry conditions | The conditions that must exist before and during entry (oxygen range, LEL ceiling, toxic gas limits, temperature) | Provides the pass/fail criteria the entrant and attendant monitor against. |
| 9 | Initial atmospheric test results | Oxygen %, LEL %, CO ppm, H2S ppm, and any other contaminants relevant to the space, with the date, time, and tester’s name | Documents that the atmosphere was safe at the start. Required before any entrant breaks the plane of the opening. |
| 10 | Periodic test results | Ongoing test readings recorded at intervals during the entry | Conditions change. Continuous or periodic monitoring is documented on the same permit. |
| 11 | Isolation and lockout/tagout | Confirmation that energy sources are isolated and locked out, lines blanked or blinded, mechanical equipment de-energized | Verifies the space is mechanically and electrically safe, not just atmospherically safe. |
| 12 | Ventilation | Method (forced air, natural), placement of the duct, duration before entry | Most atmospheric controls depend on ventilation. The permit captures how it was done. |
| 13 | Communication procedures | How the attendant communicates with entrants (voice, radio, visual, tugline) | Required by §5157(f)(12). The attendant must maintain contact at all times. |
| 14 | Equipment in use | Atmospheric monitors, retrieval equipment (tripod, harness, winch), PPE, lighting, ventilation | Documents what was actually used, not what should have been used. |
| 15 | Rescue services | Name of the rescue service, contact procedure, on-site standby vs. response time | If the rescue plan is “call 911,” the permit must say so and the limitations must be acknowledged. See confined space rescue planning. |
| 16 | Additional permits required | Hot work permit, lockout/tagout, electrical work permit, line break | Many entries require companion permits. The form forces the supervisor to confirm. |
| 17 | Entry supervisor signature and time of authorization | Signature and the time entry was authorized | The legal moment entry was approved. |
| 18 | Cancellation | Time of cancellation, reason (completion, hazard change, end of shift), and supervisor signature | Closes the permit. Canceled permits are retained for at least one year per Cal/OSHA §5157(e)(6). |
When we walk a facility, the first thing we look for in the permit binder is whether the atmospheric test fields are filled in with actual numbers or just initialed. Initialed-but-blank readings show up constantly. They are not a permit, they are a forgery risk.
How Long Is a Confined Space Permit Good For?
A confined space entry permit is good for the duration written on the permit itself, and no longer. Cal/OSHA §5157(e)(4) requires the entry supervisor to specify the duration. In practice, that almost always means one shift, one task, or the time required to complete the planned work, whichever is shorter.
Permits expire when:
- The authorized duration ends.
- The task is completed.
- Conditions inside the space change (atmospheric, mechanical, or operational).
- The entry supervisor terminates entry.
If work continues into the next shift, a new permit is issued. If the atmosphere changes, the existing permit is canceled and a new entry, with a new permit, must be authorized.
Who Must Sign a Confined Space Entry Permit?
The entry supervisor signs the permit to authorize entry. Cal/OSHA §5157(e)(2) requires the entry supervisor identified on the permit to sign it to authorize entry, and §5157(j) makes the supervisor responsible for verifying that the permit is complete, that hazards are controlled, and that rescue services are available before signing.
Authorized entrants and attendants do not sign to authorize entry. Their names appear on the permit, but the supervisor’s signature is the legal authorization. For the full breakdown of who does what during an entry, see confined space roles: entrant, attendant, and entry supervisor.
Lockout/Tagout and the Entry Permit
If the space contains energy sources (pumps, agitators, electrical, hydraulic, steam, chemical lines), lockout/tagout must be completed and verified before entry, and the permit must reflect it. The isolation field on the form is not a checkbox to initial. It is a list of locks, tags, blanks, and blinds applied to specific energy sources.
A confined space entry that overlaps with maintenance work almost always requires both a confined space permit and a lockout/tagout procedure running in parallel. For more on how the two interact, see when lockout/tagout and confined space entry overlap.
Common Mistakes We See on Entry Permits
When we audit confined space programs, the same permit issues come up repeatedly:
- Atmospheric test fields blank or filled in with the same number every time.
- “Acceptable entry conditions” missing entirely, so there is no pass/fail standard.
- Same permit reused for multiple entries instead of issuing a new one each time.
- Rescue services field listing “call fire department” with no confirmation that the local fire department actually performs confined space rescue.
- No cancellation entry, so the permit binder shows entries that were never closed out.
- Attendants listed but with no record of who was actually posted during the entry.
For more on atmospheric monitoring and what those test fields should contain, see atmospheric testing for confined space entry.
Get Your Permit Forms Reviewed
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BSY started working with CDMS last year after our in-house EHS person departed the company. CDMS reviewed our existing operational permits as well as any additional Federal, State and Local regulations that could apply and helped us to create a comprehensive compliance calendar to track regulatory deadlines and submittal due dates. The CDMS team does an excellent job of tracking everything and can be relied upon to complete the forms accurately and assist with submittals, allowing me to focus on our business.
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