Definition
Compressed gas is any gas pressurized above atmospheric pressure (14.7 psi) and stored in a sealed cylinder or container. The pressure creates serious hazards: rapid release can cause explosions, inert gases can displace oxygen causing asphyxiation, and certain gases like chlorine or ammonia are toxic on contact.
OSHA Regulations and Compliance
OSHA classifies compressed gases under 29 CFR 1910.106 through 1910.107, with specific standards for handling, storage, and transportation. Cylinders must be marked with the gas type, pressure rating, and hazard class. Safety managers must ensure cylinders are stored upright (except for certain liquefied gases), secured to prevent falling, and kept away from heat sources and flammable materials. Acetylene cylinders cannot be stored horizontally or above 104 degrees Fahrenheit, and oxygen cylinders must be separated from fuel gases by at least 20 feet or a 5-foot fire-rated wall.
Your facility requires a safety audit if you store more than 10 pounds of compressed gas or operate equipment using compressed gases regularly. OSHA inspectors look for proper labeling, pressure relief devices, and documented training records for employees handling cylinders.
Workplace Hazards
- Explosion risk: A ruptured cylinder can become a projectile. A typical propane cylinder contains 100 pounds at 250 psi. Rapid decompression releases this energy violently.
- Asphyxiation: Nitrogen and argon displace oxygen in enclosed spaces. Workers have collapsed in minutes without warning signs.
- Chemical burns: Compressed oxygen accelerates combustion and increases fire severity by 50 to 100 percent. Ammonia and chlorine cause immediate respiratory damage.
- Regulator failure: Faulty pressure reduction systems can cause uncontrolled gas release. Always inspect regulators before use.
Storage and Handling Best Practices
- Store cylinders in designated areas on stable, level ground. Use chains or straps rated for at least 2,500 pounds to prevent tipping. See Cylinder Storage for detailed requirements.
- Keep cylinders away from electrical equipment, welding operations, and direct sunlight. Temperature above 54 degrees Celsius triggers pressure relief vents.
- Post warning signs indicating the gas type and hazard class. At minimum, use pictograms showing explosion, flame, or toxicity symbols.
- Ensure cylinders have seals or caps installed at all times when not in use. A missing cap exposes the valve to damage and contamination.
- Establish a cylinder rotation system. Empty cylinders should be marked and segregated from full stock.
- Train all personnel on emergency shutdown procedures. Employees must know where emergency shutoff valves are located and how to operate them.
Home Safety Considerations
Homeowners typically encounter compressed gases in propane grills, welding tanks, or HVAC systems. Never store propane cylinders indoors or in garages. Keep them upright on a flat surface at least 10 feet from doors and windows. If you smell rotten eggs (the odorant added to propane), evacuate immediately and call 911. Check hose connections annually and replace any with visible corrosion. For emergency preparedness, know the location of your cylinder shutoff valve and how to operate it without tools.
Emergency Preparedness
Include compressed gas procedures in your facility emergency plan. Employees must know evacuation routes from storage areas and the location of emergency eyewash stations and safety showers. If a cylinder develops a leak, evacuate the area immediately and call your gas supplier or local fire department. Do not attempt repairs yourself. For facilities in fire-prone regions, compressed gas storage areas should be separated from structures by at least 50 feet or protected by automatic sprinkler systems.
Common Questions
- How often should cylinders be inspected? OSHA requires visual inspection before each use. Full hydrostatic testing is required every 3 to 10 years depending on the cylinder type, marked on the cylinder collar.
- Can I transport a compressed gas cylinder in my vehicle? Yes, but cylinders must be secured upright in a well-ventilated area, never in the passenger cabin. Follow local hazmat transportation rules, which may require placards for quantities over specific thresholds.
- What is the difference between DOT and non-DOT cylinders? DOT cylinders meet Department of Transportation standards and can be refilled and reused. Non-DOT cylinders are single-use and should be returned to the supplier for disposal.
Related Concepts
Cylinder Storage covers specific requirements for securing and organizing compressed gas containers. Regulator explains how pressure reduction systems control gas flow safely. Understanding these components together ensures comprehensive hazard control.