OSHA’s Permit-Required Confined Spaces standard at 29 CFR 1910.146 establishes requirements for practices and procedures to protect general industry employees from the hazards of entering permit-required confined spaces. The standard applies to any space that is large enough for an employee to enter, has limited or restricted means of entry or exit, and is not designed for continuous occupancy. Permit spaces additionally contain or have the potential to contain hazardous atmospheres, engulfment hazards, convergent walls, or other recognized serious hazards. A program-level audit evaluates whether your confined space program correctly identifies all permit spaces, maintains effective entry procedures, ensures proper atmospheric monitoring, and provides adequate rescue capabilities.
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Download Checklist (.docx)Regulatory Requirements
29 CFR 1910.146 — Permit-Required Confined Spaces (General Industry)
The PRCS standard requires employers to evaluate the workplace for permit spaces, implement a written permit space program, develop and issue entry permits, designate entry supervisors/attendants/entrants with defined duties, ensure atmospheric testing before and during entry, provide rescue and emergency services, and conduct annual program reviews using canceled permits. The standard applies to general industry; construction confined spaces are covered under 29 CFR 1926 Subpart AA.
29 CFR 1926 Subpart AA — Confined Spaces in Construction
Construction employers must comply with 29 CFR 1926.1201–1926.1213 for confined space entry during construction activities. While similar to the general industry standard, the construction standard includes additional requirements for host employer/controlling contractor communication, continuous atmospheric monitoring provisions, and specific competent person qualifications. Employers performing both general industry and construction activities must comply with the applicable standard for each type of work.
OSHA Appendices A through F to 1910.146
The standard includes six appendices providing non-mandatory guidance: Appendix A (Permit-Required Confined Space Decision Flow Chart), Appendix B (Procedures for Atmospheric Testing), Appendix C (Examples of Permit Space Programs), Appendix D (Sample Permits), Appendix E (Sewer System Entry), and Appendix F (Rescue Team or Rescue Service Evaluation Criteria). These appendices represent OSHA’s recommended best practices and are commonly referenced during compliance audits.
Confined space fatalities often involve would-be rescuers. OSHA data shows that over 60% of confined space fatalities involve rescuers who enter without proper training, equipment, or atmospheric monitoring. Ensure your rescue provisions are adequate and that untrained employees are strictly prevented from attempting rescue.
Space Identification and Evaluation
| Audit Item | Expected Finding / What to Evaluate |
|---|---|
| Workplace evaluation | The employer has conducted a comprehensive evaluation of the workplace to identify all confined spaces and determine which are permit-required per 1910.146(c)(1). Evaluation considers all three criteria: (1) large enough for bodily entry, (2) limited or restricted entry/exit, (3) not designed for continuous occupancy. Evaluation is documented and updated when workplace changes occur. |
| Hazard classification | Each identified confined space has been evaluated for permit-required hazards: hazardous atmosphere (oxygen deficiency/enrichment, flammable gases, toxic substances), engulfment, converging walls/floors, and other recognized serious hazards. Spaces are classified as permit-required, non-permit, or reclassified non-permit with documentation supporting each determination. |
| Space inventory and signage | A complete inventory of all confined spaces is maintained with location, classification, and known hazards documented. Permit spaces are marked with danger signs reading 'DANGER — PERMIT-REQUIRED CONFINED SPACE, DO NOT ENTER' or equally effective warning per 1910.146(c)(2). Sign condition and legibility are maintained. |
| Reclassification procedures | Any spaces reclassified from permit-required to non-permit status per 1910.146(c)(7) have documented evidence that all hazards have been permanently eliminated without entry. If entry is required to eliminate hazards, the space is entered under the full permit program. Reclassification documentation is maintained and reviewed if conditions change. |
Written Permit Space Program
| Audit Item | Expected Finding / What to Evaluate |
|---|---|
| Program documentation | A written permit space program is established and maintained per 1910.146(d). The program documents the means, procedures, and practices for safe permit space entry including hazard identification, isolation procedures, atmospheric testing protocols, communication procedures, equipment requirements, and rescue provisions. The program is available for employee inspection per 1910.146(c)(4). |
| Entry prevention measures | If the employer decides employees will not enter permit spaces, effective measures prevent unauthorized entry per 1910.146(c)(3). Physical barriers, locks, and/or administrative controls are in place. Measures are verified through periodic inspections. |
| Multi-employer coordination | When multiple employers have employees working in or near permit spaces, the host employer informs contractors about permit spaces, hazards, and entry program requirements per 1910.146(c)(8)-(9). Contractors inform the host employer of their entry program and any hazards they encounter or create. Coordination is documented. |
| Program availability | The written program is made available for inspection by affected employees and their authorized representatives per 1910.146(c)(4). Employees know where to access the program. Current copies are maintained at locations where confined space entry occurs. |
Entry Permit System
| Audit Item | Expected Finding / What to Evaluate |
|---|---|
| Permit content | Entry permits contain all required information per 1910.146(f): space identification, purpose of entry, date and authorized duration, authorized entrants, entry supervisors and attendants, hazards identified, isolation and control measures, acceptable entry conditions, test results, rescue and emergency services, communication procedures, additional permits (hot work), and equipment required. |
| Permit authorization and duration | Permits are signed by the entry supervisor before entry begins. Permits do not exceed the time required to complete the task. The entry supervisor verifies all conditions on the permit have been met before authorizing entry. Permit is canceled when entry operations are completed or when conditions change per 1910.146(e)(5). |
| Canceled permit retention | Canceled permits are retained for at least one year per 1910.146(e)(6) to facilitate the annual program review. Permits include documentation of test results, any problems encountered, and the basis for terminating the permit. |
Atmospheric Testing and Monitoring
| Audit Item | Expected Finding / What to Evaluate |
|---|---|
| Pre-entry testing | The atmosphere is tested before entry using calibrated direct-reading instruments per 1910.146(d)(5)(ii). Testing sequence follows the required order: (1) oxygen (19.5%–23.5% acceptable), (2) flammable gases and vapors (below 10% LEL), (3) toxic gases and vapors (below PELs). Testing is conducted at multiple levels within the space (top, middle, bottom) to account for stratification. |
| Continuous monitoring | Atmospheric conditions are monitored continuously or periodically during entry as necessary to ensure acceptable conditions are maintained per 1910.146(d)(5)(ii). Continuous monitoring is required when atmospheric hazards may develop during work activities (e.g., welding, painting, cleaning). Alarms on monitoring equipment are set at appropriate action levels. |
| Instrument calibration and maintenance | Atmospheric testing instruments are calibrated according to manufacturer specifications and before each use per the manufacturer’s instructions. Calibration records are maintained. Bump testing is performed before each day of use. Instruments are maintained in good working condition with current sensor replacements and battery checks. |
| Test result documentation | All atmospheric test results are recorded on the entry permit with time, location within the space, readings obtained, and tester name. Unacceptable readings trigger entry prohibition until the space is ventilated and retested to acceptable levels. Historical test data is available for the annual program review. |
Entry Roles and Training
| Audit Item | Expected Finding / What to Evaluate |
|---|---|
| Entry supervisor duties | Entry supervisors are trained and authorized to oversee permit space entries per 1910.146(j). Supervisors know the hazards, verify permit conditions, authorize entry, terminate entry when conditions change, and ensure rescue services are available. Training covers all duties specified in 1910.146(j). |
| Authorized entrant duties | Authorized entrants are trained on hazards they may face, recognition of symptoms, proper equipment use, communication with attendants, and when to evacuate per 1910.146(h). Entrants know to alert the attendant of any warning signs and to exit immediately when ordered or when they recognize dangerous conditions. |
| Attendant duties | Attendants are trained on their duties per 1910.146(i): monitoring entrants, maintaining accurate count, remaining outside the space, communicating with entrants, monitoring conditions, ordering evacuation when necessary, summoning rescue services, and performing non-entry rescue when possible. Attendants do not enter the space for rescue. Attendants monitor no more permit spaces than they can effectively manage. |
| Training documentation | All training is documented with employee name, trainer signatures, and training dates per 1910.146(g)(4). Training is provided before initial assignment, before duties change, when hazards change, when program deficiencies are identified, and whenever deviations occur. Training establishes proficiency in required duties. |
Rescue and Emergency Services
| Audit Item | Expected Finding / What to Evaluate |
|---|---|
| Rescue provisions | The employer has arranged for rescue and emergency services per 1910.146(d)(9) and 1910.146(k). Either an on-site rescue team is trained and equipped, or an off-site rescue service has been evaluated for capability and response time. Response time is adequate to protect entrants from identified hazards. Rescue service has been informed of the hazards they may encounter. |
| Rescue equipment | Retrieval systems are used whenever entry is made per 1910.146(k)(3) unless they would increase the overall risk or would not contribute to rescue. Retrieval lines are attached to entrants and to a mechanical device or fixed point outside the space. Full-body harnesses are used with retrieval lines attached at the center of the back near shoulder level or above the head. Tripods or other retrieval devices are available. |
| Rescue team evaluation | If using an off-site rescue service, the employer has evaluated the service per Appendix F criteria including: response time, capability to function in the specific permit spaces, availability, rescue team member training and practice frequency, and number of team members. Written agreement or MOU is in place documenting the arrangement. |
| Practice rescues | On-site rescue teams practice making permit space rescues at least once every 12 months using simulated conditions per 1910.146(k)(2)(iv). Practice includes use of actual rescue equipment and involves removal of dummies or actual persons from representative permit spaces. Practice rescue documentation is maintained. |
Program Review and Improvement
| Audit Item | Expected Finding / What to Evaluate |
|---|---|
| Annual program review | The permit space program is reviewed using canceled permits retained under 1910.146(e)(6) within one year after each entry per 1910.146(d)(14). Review evaluates whether current procedures adequately protect employees. If no entry was performed during a 12-month period, no review is necessary. Review findings are documented. |
| Deficiency correction | Deficiencies identified during the annual review, near-miss events, or actual incidents are addressed through program revisions. Revised procedures are communicated to all affected employees. Additional training is provided when program changes affect employee duties. |
| Equipment inspection | All confined space entry equipment is inspected regularly and maintained per manufacturer specifications. This includes atmospheric monitors, ventilation equipment, communication devices, PPE, retrieval systems, and lighting. Defective equipment is removed from service and replaced before entry. |
Audit frequency: Conduct a formal program review at least annually using canceled permits per 1910.146(d)(14). Perform pre-entry audits before each permit space entry to verify procedures, equipment, and rescue provisions. Review the confined space inventory whenever facility modifications create new spaces or change existing hazards.
Corrective Actions
Common Issues and Responses
- Unidentified permit spaces: Conduct a comprehensive facility survey to identify all confined spaces and determine permit-required status. Engage a qualified industrial hygienist or safety professional to evaluate hazards. Document all spaces, install signage, and update the space inventory.
- Incomplete entry permits: Review permit forms against 1910.146(f) requirements. Revise permit templates to include all required elements. Train entry supervisors on proper permit completion and verification procedures.
- Inadequate atmospheric testing: Review and revise atmospheric testing procedures. Ensure instruments are properly calibrated and bump-tested. Retrain testers on the required testing sequence (oxygen first, then combustibles, then toxics) and multi-level testing within the space.
- No rescue provisions: Immediately prohibit permit space entry until adequate rescue provisions are established. Evaluate on-site rescue team capability or contract with a qualified off-site rescue service. Verify response time is adequate for the identified hazards.
- Outdated or no annual review: Conduct an immediate program review using canceled permits from the past year. Document findings and revise the program as needed. Establish an annual review schedule and assign responsibility.
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