Safety Operation & Maintenance Manual Compressed Air Compressed air can be dangerous if incorrectly handled. Prior to performing maintenance or service on the compressor, ensure all pressure is vented from the system and the compressor cannot be started accidentally. Ensure the compressor is operating at the rated pressure and the rated pressure is known to all relevant personnel. All air pressure equipment installed in, or connected to, the compressor must have safe working pressure ratings of at least the compressor safety valve setting.
If more than one compressor is connected to one common downstream plant, effective check valves and isolation valves must be fitted and controlled by work procedures, to ensure one compressor cannot accidentally be pressurized or over pressurized by another. Compressed air must NOT be used for a direct feed to any form of breathing apparatus or mask. Compressed air can cause serious injury or death. Relieve pressure before removing filler plugs/caps, fittings, or covers. Air pressure can remain trapped in air supply line which can result in serious injury or death. Always carefully vent air supply line at tool or vent valve before performing any service or maintenance.
Discharged air contains a very small percentage of compressor lubricating oil and care should be taken to ensure downstream equipment is compatible. If discharged air is to be ultimately released into a confined space, adequate ventilation must be provided. When using compressed air, always use appropriate personal protective equipment. All pressure containing parts, especially flexible hoses and their couplings, must be regularly inspected, be free from defects, and be replaced according to the manual instructions. Avoid bodily contact with compressed air. The safety valve located in the separator tank must be checked periodically for correct operation.
Whenever the compressor is stopped, air will flow back into the compressor from downstream devices or systems unless the service valve is closed. Install a check valve at the compressor service valve to prevent reverse flow in the event of an unexpected shutdown when the service valve is open. Disconnected air hoses whip and can cause serious injury or death. Always attach a safety flow restrictor to each hose at the source of supply or branch line in accordance with OSHA Regulation 29CFR Section 1926.302(b). Never allow the compressor to sit stopped with pressure in the separator tank or piping. 13