4.3 Compressed Air

Best practice guidelines recommend that compressed air should not be used for cleaning purposes except when the air is reduced to less than 30 pounds per square inch (200 kPa) and effective screens or barriers and personal protective equipment (PPE) are used. Compressed air is not to be used for cleaning individuals or clothing. It may be used to clean equipment only. When using compressed air:

• Use it only for approved processes.

• Do not point a compressed air gun at yourself or at others. Be aware of individuals in the area; watch for anyone passing by to ensure that no one is exposed to compressed air.

• Ensure that compressed air guns used at a pressure greater than 30 psi (200 kPa) are equipped with a relief device that will drop the pressure to less than 30 psi (200 kPa) if the flow is dead-ended (which occurs when the nozzle of the gun is pressed tightly against a surface and creates potentially dangerous back pressure).

• Use a constant-pressure trigger (dead-man trigger) so that airflow will stop when the trigger is released.

• Use appropriate PPE, including hearing protection and goggles.

• Inspect all air hoses before use. If hoses are damaged, frayed, or worn, replace them. Ensure all hose fittings are tight.

• Make sure hose ends are secured while in use to prevent whipping if a break in the hose occurs.

• Before disconnecting the air hose, shut off the compressed air. Bleed off any residual air. When finished, coil the hoses and hang them in a designated area to prevent tripping.

• Never modify or tamper with air guns.