Compressed air is widely used in manufacturing, construction, automotive, and industrial settings for powering tools, machinery, and pneumatic systems. However, despite its usefulness, compressed air can be extremely dangerous if not handled properly.
Improper use of compressed air lines and cylinders can lead to serious injuries, explosions, and even fatalities. This guide outlines UK Health and Safety Executive (HSE) regulations, common hazards, and best practices for safe handling, inspection, and use of compressed air systems.
UK HSE Regulations for Compressed Air Safety
Under UK law, compressed air systems must be maintained, inspected, and used safely to prevent workplace injuries. The key regulations include:
1. The Pressure Systems Safety Regulations (PSSR) 2000
- Employers must assess risks and implement safety measures for pressurised equipment.
- Regular inspections and testing are required to prevent leaks, ruptures, or cylinder failures.
2. The Provision and Use of Work Equipment Regulations (PUWER) 1998
- Compressed air equipment must be well-maintained and inspected.
- Workers using compressed air tools must be properly trained.
3. The Health and Safety at Work Act 1974
- Employers must ensure compressed air does not pose risks to workers, contractors, or the public.
4. The Control of Substances Hazardous to Health (COSHH) Regulations 2002
- Air systems must be free from contaminants (e.g., oil, dust, toxic fumes) that could harm workersβ health.
Failure to comply with these safety laws can result in serious accidents, legal action, and fines.
Common Hazards of Compressed Air Lines & Cylinders
Injection Injuries: Compressed air can penetrate the skin, causing severe internal injuries, even at pressures as low as 30 psi.
Eye & Ear Damage: High-pressure air can cause blindness or hearing loss if directed at the face.
Respiratory Hazards: Contaminants in compressed air can lead to lung damage or asphyxiation.
Air Hose Whiplash: A disconnected air hose can whip violently, leading to serious injuries.
Cylinder Explosions: Overpressurised or poorly stored cylinders can rupture violently, causing fatal accidents.
Unintended Movement of Objects: Compressed air can turn debris or tools into dangerous projectiles.
Compressed Air Safety Inspection & Maintenance
1. Daily Pre-Use Checks
Operators should inspect compressed air lines, cylinders, and tools before use.
Check for leaks in hoses and fittings.
Ensure pressure regulators are correctly set.
Inspect cylinders for dents, corrosion, or damage.
Verify that air hoses are secured properly to prevent disconnection.
Test emergency shut-off valves and relief devices.
2. Routine Servicing & Testing
Under PSSR 2000, compressed air systems must undergo regular servicing by a competent engineer.
Inspection Frequency:
- Small air compressors (<250 bar litres): Every 12 months
- Large pressure systems (>250 bar litres): Every 6 months
Key Maintenance Tasks:
Lubricating moving parts to prevent wear.
Replacing damaged hoses and couplings.
Checking safety valves and pressure gauges.
Inspecting storage cylinders for structural integrity.
Draining water traps to prevent moisture buildup.
Tip: Keep a logbook of all inspections and repairs for HSE compliance.
3. Annual Pressure System Inspection (Thorough Examination)
Employers must arrange an independent safety inspection at least once a year for pressurised air systems.
Whatβs Checked in an Annual Inspection?
Cylinder wall thickness and corrosion levels.
Hose integrity and connection security.
Relief valve function and pressure settings.
Compressor air quality and contaminant levels.
A written safety report must be provided, detailing any defects or recommended repairs.
Compressed Air Safety Best Practices
Use PPE: Always wear safety glasses, ear protection, and gloves when using compressed air tools.
Never Use Air to Clean Clothing: Blowing compressed air onto the body can inject air under the skin, causing fatal embolisms.
Secure Air Hoses: Use hose restraints and whip-checks to prevent hoses from whipping if disconnected.
Store Cylinders Correctly: Keep air cylinders upright, secured, and away from heat sources.
Use Proper Pressure Levels: Avoid exceeding the recommended pressure settings for tools and machinery.
Train Employees: Ensure all staff handling compressed air systems understand safety protocols.
What to Do in a Compressed Air Accident?
Stop the air supply immediately using emergency shut-off valves.
Seek medical help for injection injuries, even if no wound is visible.
Evacuate the area if a cylinder leak or rupture is detected.
Report the incident and conduct an investigation.
Arrange repairs and implement additional safety measures if necessary.
Legal Penalties for Non-Compliance with HSE Air System Regulations
Failure to maintain and inspect compressed air systems can result in:
Fines & Prosecution: Businesses can face unlimited fines for serious safety breaches.
Workplace Injuries & Claims: Employers may be liable for compensation claims due to air-related injuries.
HSE Enforcement Notices: Inspectors can shut down unsafe workplaces until corrective actions are taken.
Increased Insurance Costs: Unsafe air systems raise liability risks and premiums.
Example: A UK engineering firm was fined Β£150,000 after an employee suffered permanent lung damage due to contaminated compressed air exposure.
Final Thoughts: Ensuring Safe Compressed Air Use in the Workplace
Compressed air is a powerful but hazardous tool. Employers must prioritise safety, regular inspections, and employee training to prevent injuries, system failures, and legal consequences.
Conduct daily safety checks and leak inspections.
Arrange annual inspections and servicing.
Train employees on safe handling procedures.
Use hose restraints, PPE, and proper pressure settings.
Keep detailed maintenance records for compliance.
By following these best practices, businesses can maintain a safe, efficient, and legally compliant compressed air system.