What this is
What is a confined space register?
What is a confined space register?
A record of every confined space on site, with its classification, the hazards present, the isolation points, access restrictions and rescue considerations. It is the source document from which entry permits, procedures, signage and training are derived.
What makes a space permit-required?
It meets the definition of a confined space and contains or has the potential to contain a hazardous atmosphere, contains material with the potential to engulf, has an internal configuration that could trap or asphyxiate, or contains any other recognised serious safety or health hazard.
Scope
When is a confined space register required?
The register identifies and classifies spaces. Entry, testing and rescue are separate records derived from it.
Use this template when
- Identifying and classifying every confined space on site, by physical survey
- Recording hazards, isolation points, access restrictions and rescue considerations per space
- Updating after construction, modification, process change or repurposing of any vessel or area
- Supporting signage, permit design and training content for the specific spaces present
- Providing the information contractors need before they mobilise
Do not use it for
- The entry permit, which authorises a specific entry into a specific space at a specific time
- Atmospheric testing records, which capture readings at entry
- The rescue plan, which is space-specific and requires an evaluation of the rescue service's capability
- Energy control procedures, which specify isolation for the equipment associated with the space
- Confined space training records, which evidence competence by role
Compliance mapping
Which OSHA 1910.146 requirements does this satisfy?
The register underpins the whole permit space programme and is where the standard's classification logic is applied.
| Clause | Requirement | Where it lands |
|---|---|---|
| 1910.146(c)(1) | Evaluate the workplace to determine whether it contains permit-required confined spaces | Spaces |
| 1910.146(c)(2) | Inform exposed employees of the existence, location and danger of permit spaces by signs or equally effective means | Spaces |
| 1910.146(c)(5) | Alternate procedures where the only hazard is atmospheric and continuous forced ventilation maintains safety | Spaces |
| 1910.146(c)(7) | Reclassification to non-permit only where all hazards are eliminated, with certification | Spaces |
| 1910.146(c)(8) | Information exchange with contractors about permit spaces and the hazards within them | Spaces |
| 1910.146(d)(1) | Prevent unauthorised entry, which depends on knowing where the spaces are | Register health |
| WorkSafeBC Part 9 | Confined space identification, hazard assessment and written entry procedures (British Columbia) | Header |
| 1926 Subpart AA | Construction confined space requirements, which differ from general industry | Header |
What it does not cover
- The entry permit, which authorises a specific entry with its twelve required elements.
- Atmospheric test records, which capture readings before and during entry.
- The rescue plan and rescue service evaluation, which is space-specific and required under (k).
- Energy control procedures for the equipment serving the space.
- Training certification, which evidences competence for entrant, attendant and supervisor roles.
How to complete it
How to complete a confined space register, step by step
Two activities produce a reliable register: walking the site, and getting the classification right.
Drawings show designed vessels. They do not show the pit created when a floor was lowered, the void behind a tank installed against a wall, the duct that became accessible when a panel was removed, or the chamber that was always there and never labelled. A physical walk with someone who knows the definition finds spaces that no drawing set contains.
Confined space or not; if so, permit-required or not; if permit-required, is alternate procedure entry available or has every hazard been eliminated. Each step has criteria and each produces different obligations. Recording the reasoning matters as much as the conclusion, because the classification will be questioned after an incident.
Hazards present, isolation points, previous contents, access dimensions and orientation, whether retrieval equipment can physically be used, and rescue considerations. That information determines whether an entry can be planned safely and is otherwise reconstructed at the space by whoever turns up.
New vessels, modifications, process changes, repurposing and even relocation of equipment create or alter spaces. Link the register to management of change so that a modification raises the question, because a space created incidentally will otherwise appear on the register only after someone has entered it.
What auditors find
Most common confined space register findings
Register findings are disproportionately consequential because everything downstream depends on them.
| Finding | Clause | What fixes it |
|---|---|---|
| Spaces present on site but absent from the register. | 1910.146(c)(1) | Survey physically; drawings do not show incidentally created spaces. |
| Space reclassified as non-permit while relying on continuous ventilation. | 1910.146(c)(7) | Reclassification requires elimination; ventilation is a control and the space stays permit-required. |
| Alternate procedure entry used where a non-atmospheric hazard is present. | 1910.146(c)(5) | Alternate procedures apply only where the sole hazard is atmospheric. |
| Permit spaces not signposted or otherwise identified to employees. | 1910.146(c)(2) | Signs or equally effective means; the register is not visible at the space. |
| Register not updated after a modification or new installation. | 1910.146(c)(1) | Link to management of change; new spaces appear without anyone deciding to create them. |
| Classification recorded without reasoning. | 1910.146(c)(1) | Record why; the decision will be examined after an incident. |
| Contractors not informed of permit spaces before mobilisation. | 1910.146(c)(8) | Exchange information in both directions before work begins. |
| Rescue considerations not recorded per space. | 1910.146(k) | Access dimensions and retrieval feasibility are space-specific and determine whether rescue is possible. |
| Construction work managed under the general industry standard. | 1926 Subpart AA | Construction has its own requirements; check which applies to the work. |
| Unauthorised entry not prevented because the space is unmarked. | 1910.146(d)(1) | Identification at the space is the practical control against casual entry. |
Case in point
Case in point: the pit that was not on any list
A plant carried a confined space register covering fourteen spaces: tanks, silos, a blend vessel and two sumps. It was reviewed annually, spaces were signposted, permits were issued properly and training was current. The programme was well run.
During a floor repair a maintenance fitter removed a steel plate to access a cable route and dropped into a void beneath the plate, roughly a metre deep, to reach a junction box. The void ran beneath a section of the production floor and had accumulated a heavier-than-air vapour from a nearby transfer operation.
The void was not on the register, not signposted and not classified, because it had been created during a floor alteration years earlier and existed on no drawing. It met the definition of a confined space in every respect, and nobody had ever walked the site asking the question.
The template
The template, field by field
The form exactly as it installs. Every field, option, score and conditional rule is editable, and the links to other templates come with it.
3 sections
- Reference
- SAF-105
- Archetype
- Register
- Record ID
- CSPACE-2026-000
- Scoring
- Not scored
- Direction
- n/a
- Singleton
- No
- Basis
- OSHA 1910.146, WorkSafeBC 9
- Links
- Links Site, Asset
- Tags
- Confined space, Master data
- Sections
- 3
- Fields
- 40
- Follow up fields
- 3
- Repeating sections
- 1
- Links out
- 4
Header
7 fieldsRegister ID*
Auto sequence. Format CSP-2026-000.
The record's own ID. Other templates point at this value.
Status*
Drives who this goes to next.
- Planned2 pts
- In progress2 pts
- Complete3 pts
- Deferred0 pts
- Open0 pts
- Closed3 pts
- Overdue0 pts
Site*
Site ID*
Format SITE-000.
Links to FDN-001 Site ID
Last Reviewed*
Reviewed By*
Next Review Due*
Spaces
Repeats22 fieldsSpace ID*
Space Name*
Space Type*
Tank, silo, vessel, pit, duct, chamber, tanker or interceptor.
Asset
Asset ID
Format AST-0000.
Links to FDN-002 Asset ID
Location Description*
Access Type*
Access Opening Size
Determines whether rescue with breathing apparatus is possible.
Normal Contents*
Residue Hazards*
Oxygen Deficiency Risk*
- None credible4 pts
- Low3 pts
- Medium1 pt
- High0 pts
Flammable Atmosphere Risk*
- None credible4 pts
- Low3 pts
- Medium1 pt
- High0 pts
Toxic Atmosphere Risk*
- None credible4 pts
- Low3 pts
- Medium1 pt
- High0 pts
Engulfment Risk*
Powders, grain and liquids can engulf faster than a person can climb out.
- None credible4 pts
- Low3 pts
- Medium1 pt
- High0 pts
Mechanical Hazard Inside*
- None4 pts
- Isolatable2 pts
- Present and hard to isolate0 pts
Remote Start Possible*
CIP and automated systems can start while somebody is inside.
- No4 pts
- Yes, isolatable1 pt
- Yes, difficult to isolate0 pts
Classification*
- Non hazardous3 pts
- Hazardous0 pts
- Animal by-product category 10 pts
- Animal by-product category 21 pt
- Animal by-product category 32 pts
- Special0 pts
Entry Permit Required*
- Yes2 pts
- No0 pts
- N/Aexcluded from denominator
Rescue Plan ID
Links to SAF-103 Plan ID
Signage In Place*
- Yes3 pts
- Partly1 pt
- No0 pts
Access Secured Against Casual Entry*
- Yes2 pts
- No0 pts
- N/Aexcluded from denominator
Photo
Register health
11 fieldsSpaces On Register*
New Spaces Found This Review*
Spaces Without Rescue Plan*
Action Required*
Raise the action record, then enter its reference here.
- No2 pts
- Yes0 pts
Priority
- High0 pts
- Medium1 pt
- Low3 pts
CAPA ID
Format CAPA-2026-00000.
Links to FDN-014 CAPA ID
Action Owner
Reviewed By*
Signature*
Site Manager*
Second Signature*
SAF-105 · record IDs look like CSPACE-2026-000 · Links Site, Asset
Open in KnowellaRun it with agents
From a document you fill in to a programme that runs itself
The register underpins everything. What fails is the space nobody surveyed and the classification that treated a control as elimination.
Holds the register with classification reasoning per space, and links each space to its permit template, signage and training requirement.
Raises the confined space question inside management of change, so modifications and new installations reach the register.
Connects spaces to their isolation points and associated equipment, so an entry can be planned from the record rather than at the space.
Supplies the two-way information exchange contractors need before mobilisation, which the standard requires explicitly.
This template lives in KnowSafe — safety and compliance. Incidents, hazards, permits, inspections and the critical controls behind them.
Meet KnowSafe→Glossary
Confined Space Register definitions and key terms
- Confined space
- Large enough to enter and perform work, with limited or restricted means of entry or exit, and not designed for continuous occupancy.
- Permit-required confined space
- A confined space with a hazardous atmosphere, engulfment potential, entrapping configuration or any other recognised serious hazard.
- Alternate procedures
- Entry under 1910.146(c)(5) where the only hazard is atmospheric and continuous forced ventilation maintains a safe atmosphere.
- Reclassification
- Redesignation as non-permit under (c)(7), available only where every hazard has been eliminated rather than controlled.
- Engulfment
- Surrounding and capture by a divisible solid or liquid substance that can cause death by filling the respiratory system or by crushing.
- Isolation
- Removal of a space from hazardous energy and material by blanking, blinding, misaligning lines, double block and bleed, or disconnection.
- Retrieval system
- Harness and line with a mechanical device where the space is over five feet deep, enabling non-entry rescue.
- Register health
- Whether the register still reflects the site, measured by survey rather than by review date.
FAQ
Frequently asked questions about confined space register
How do we find all the confined spaces?+
By walking the site with the definition in mind, lifting covers and opening panels. Drawings show designed vessels and miss the spaces created incidentally: voids under floors, chambers behind equipment, ducts, pits from alterations. Those are consistently the ones that catch people, because they are unmarked, unclassified and unlisted.
When can a space be reclassified as non-permit?+
Only when every hazard within it has been eliminated, and the determination must be certified. Continuous forced ventilation eliminates nothing: switch it off and the atmosphere returns. A space kept safe by a running fan is controlled rather than eliminated and remains permit-required, which is among the most consequential classification errors in the standard.
What are alternate procedures?+
Entry under 1910.146(c)(5) where the only hazard in the space is atmospheric and continuous forced ventilation alone maintains a safe atmosphere for entry. It has defined conditions including monitoring and documentation, and it does not apply where any non-atmospheric hazard is present, such as engulfment or mechanical hazards.
What should each register entry contain?+
Location and identifier, classification with the reasoning, hazards present, previous contents, isolation points, access dimensions and orientation, whether retrieval equipment can physically be used, and rescue considerations. Without those an entry has to be planned at the space by whoever arrives, using whatever they can work out.
How often should the register be reviewed?+
On change rather than on a calendar. Modifications, new installations, process changes and repurposing all create or alter spaces, and none of them announce themselves as confined space events. Linking the register to management of change is what keeps it accurate; an annual review finds what changed only if someone remembers it.
Keep going
Related templates and programmes
Industries this is written for
Programmes this belongs to
Used together in Permit to Work
Contractor Permit Compliance Check
Checks that a contractor working under permit is doing what the permit says, at the work point
Hot Work Permit
Controls welding, cutting, grinding and any work that makes sparks or heat
Confined Space Entry Permit
Controls entry into tanks, pits, silos and other confined spaces
Energy Isolation Permit
Controls work where machinery must be shut down and locked out
Working at Height Permit
Controls work above the height set by local rules where fall protection is needed
Excavation Permit
Controls digging and trenching, including checks for buried services
More in Confined Spaces
Atmospheric Test Record
Records gas readings taken before and during confined space entry, covering oxygen, flammables and toxics
Entry Attendant Log
Records who is in the space, when they entered, when they left and every communication check
Confined Space Rescue Drill Record
Records a practice rescue from a confined space, including time to reach and recover the casualty
Confined Space Reclassification Review
Reviews whether a space can safely be moved to a lower classification, or must be moved up
Written and reviewed by
Siddarth Singh
Founder & Chief Executive Officer, Knowella
Certified Safety Professional and industrial and systems engineer with more than a decade inside food supply chain, freight and manufacturing operations. This page was written against the current text of the standards it cites, not against secondary summaries of them.
- Certified Safety Professional (CSP), Board of Certified Safety Professionals
- MBA, University of Chicago Booth School of Business
- MS and BS, The Ohio State University, Industrial and Systems Engineering
- Six Sigma Black Belt
Sources and last review. Reviewed 16 August 2026 against:
- 29 CFR 1910.146, permit-required confined spaces, particularly (c)(1) to (c)(8), OSHA
- 29 CFR 1926 Subpart AA, confined spaces in construction, OSHA
- WorkSafeBC Occupational Health and Safety Regulation Part 9, confined spaces
- 29 CFR 1910.146(k), rescue and emergency services, OSHA
- NIOSH guidance on confined space identification and evaluation
This page is general guidance, not legal advice. Confirm requirements with your jurisdiction’s regulator.