Compressed air for cleaning

Scope

OSHA’s requirements for cleaning with compressed air apply to all cleaning operations. The requirements do not apply to non-cleaning operations, though other requirements do.

Regulatory citations

• 29 CFR 1910.242(b) — Hand and portable powered tools and equipment, general

Key definitions

• Effective chip guarding: Any method or equipment which will prevent a chip or particle (of whatever size) from being blown into the eyes or unbroken skin of the operator or other workers. Effective chip guarding may be separate from the air nozzle as in the case where screens or barriers are used. The use of protective cone air nozzles are acceptable in general for protection of the operator but barriers, baffles or screens may be required to protect other workers if they are exposed to flying chips or particles.
• PSI, or psi: Pounds per square inch.
• Reduce to less than 30 psi: The downstream pressure of the air at the nozzle (nozzle pressure) or opening of a gun, pipe, cleaning lance, etc., used for cleaning purposes will remain at a pressure level below 30 psi for all static conditions. The requirements for dynamic flow are such that in the case when dead ending occurs a static pressure at the main orifice shall not exceed 30 psi. This requirement is necessary in order to prevent a back pressure buildup in case the nozzle is obstructed or dead ended.

Summary of requirements

Employers who allow employees to use compressed air for cleaning purposes must:

• Use compressed air that is reduced below 30 psi.
• Ensure chip guards are used.
• Require that PPE is used.
• Ensure workers do not use compressed air to clean bodies or clothing that is being worn.
• Inspect and maintain equipment per the manufacturer’s instructions.
• Prohibit use of compressed air to clean combustible dusts, as this may cause the dust to become airborne, posing an explosion hazard. Vacuuming techniques are generally preferable.