A source of energy
Compressed air powers tools and equipment, but also stores energy capable of causing injury. Hazards include whipping hoses, projected particles, noise and sudden pressure release. Air as the working fluid does not make the system harmless or make every connection suitable for its operating pressure.
Related concept: Pressure equipment.
Do not use it on people
Compressed air must not be directed at the body or used to clean clothing being worn. The jet and particles can damage eyes and tissues. Blowing down a bench may also resuspend respirable or combustible dust. A cleaning method suitable for the contaminant, such as industrial vacuum extraction compatible with the risk, should be prioritised.
Hoses and connections
Selection considers pressure, temperature, fluid, surroundings and service loads. Damaged components must be removed and couplings checked for secure engagement. An improvised repair may release a hose during operation. Routing must not create trip hazards or expose the hose to sharp edges, vehicles or heat sources.
Working without residual pressure
Before disconnection, repair or accessory changes, the supply is isolated and retained energy released in a controlled way, following the equipment procedure. A gauge upstream of a valve does not necessarily demonstrate absence of pressure throughout the circuit. The section where work will take place must be verified.
Hypothetical example
A person uses an air gun to clean dust from a cabinet. Dust disperses towards colleagues and may settle on sensitive components. A quieter nozzle reduces part of the noise but does not resolve exposure or contamination. A cleaning method compatible with the cabinet and residue must be selected first.
Limitations to remember
There is no universally safe blowing pressure: restrictions depend on use and jurisdiction. An industrial air network must not be used as a breathing-air supply without a specifically designed system. This article addresses compressed-air use; it does not replace inspection of the vessel, network or tool instructions.
