The regulations that govern ammonia refrigeration
Three regulatory frameworks — OSHA PSM, EPA RMP, and IIAR standards — define the compliance landscape for ammonia refrigeration facilities. Here's what each requires and how they interact.
Does your facility exceed the 10,000 lb threshold?
OSHA PSM and EPA RMP do not apply. IIAR safety standards still apply as best practice. Good time to get a formal inventory determination.
You may cross the threshold under certain operating conditions. Continuous monitoring and a current IRC inventory calculation are strongly recommended.
OSHA PSM (29 CFR 1910.119) and EPA RMP Program 3 (40 CFR Part 68) both apply. Full compliance required immediately.
OSHA PSM vs. EPA RMP: Side-by-Side Comparison
Both programs apply to ammonia at 10,000 lb. They overlap substantially but have distinct requirements.
| Requirement | OSHA PSM | EPA RMP |
|---|---|---|
| Threshold | 10,000 lb NH₃ | 10,000 lb NH₃ |
| Citation | 29 CFR 1910.119 | 40 CFR Part 68 |
| Regulator | OSHA (DOL) | EPA |
| Process Hazard Analysis | Required (Element 3) | Required (Prevention Program) |
| Emergency Response Plan | Required (Element 12) | Required (with local coordination) |
| Compliance Audits | Every 3 years | Facility audits (CCCAP: third-party) |
| Incident Investigation | Required (Element 11) | Required (root cause under CCCAP) |
| Operating Procedures | Required (Element 4) | Written procedures required |
| Training | Required (Element 5) | Training required |
| Management of Change | Required (Element 10) | Required |
| Mechanical Integrity | Required (Element 8) | Required |
| Hazard Assessment | PHA | Worst-case + alternative scenarios |
| Public Reporting | Not required | RMP submission (public record) |
| Penalty for Non-Compliance | Up to $15,625/violation/day | Up to $70,117/day |
| Public Meeting Requirement | No | Yes (CCCAP 2024) |
| Third-Party Audit | No (internal OK) | Yes (CCCAP 2024, every 3 years) |
IIAR Standards: The Technical Foundation
OSHA and EPA both rely on IIAR standards as RAGAGEP (Recognized and Generally Accepted Good Engineering Practice) for ammonia refrigeration.
Safe Design of Closed-Circuit Ammonia Refrigerating Systems
Design requirements for new ammonia refrigeration systems. Includes refrigerant piping design, PRV sizing for new systems, component specifications, system safety requirements. Used as design RAGAGEP for PSI documentation.
Minimum System Safety Requirements for Existing Closed-Circuit Ammonia Refrigeration Systems
Safety requirements for existing (pre-IIAR 2 2014) ammonia refrigeration systems. Provides a compliance pathway for older systems including PRV requirements, inspection requirements, and documentation standards.
Guidelines for Start-Up, Inspection, and Maintenance
The primary RAGAGEP for Mechanical Integrity programs under OSHA PSM Element 8. Specifies inspection types, frequency, documentation requirements, and maintenance procedures for all major system components.
Inspection, Testing, and Maintenance of Closed-Circuit Ammonia Refrigerating Systems
Detailed inspection and maintenance requirements. Complements Bulletin 110 with more specific guidance on inspection intervals, test procedures, and acceptance criteria for ammonia system components.
Official Regulatory Resources
Full text of 29 CFR 1910.119 on the OSHA website
Full text of EPA Risk Management Program rule
Purchase IIAR standards and technical guidance documents
EPA portal for Risk Management Plan submission
OSHA PSM enforcement guidance and inspection procedures
2024 amendments to the EPA Risk Management Program
Need help interpreting these regulations for your facility?
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