Atlas Copco Oil-Injected Rotary Screw Compressor GA90

Instructions for air-cooled compressors

Stop the compressor, close the air outlet valve and switch off the voltage

Cover all parts under the coolers

Remove the service plates at the fan compartment

Remove any dirt from the coolers with a fibre brush. Brush in the direction of the cooling fins

Also remove any dirt from the fan with a fibre brush

Next, clean with an air jet in the reverse direction to normal flow. Use low pressure air. If necessary, the pressure may be increased up to 6 bar(e) (87 psig)

If it is necessary to wash the coolers with a cleaning agent, consult Atlas Copco

Remove the cover used during cleaning

Replace the filter element of the electric cabinet

Open the manual drain valve (Dm) to clean the filter of the automatic drain

Test the temperature shut-down function

On water-cooled units: any water leakage found?

Is Atlas Copco Roto-Xtend Duty Fluid used?

Replace the oil separator element

The oil separator element must also be replaced when the pressure drop over it exceeds 1 bar (14.5 psi).

Enter the pressure drop while the compressor is running loaded

Is the working pressure stable?

Pressure difference monitoring is available as option

Any visible damage or corrosion on the oil separator vessel?

Enter the minimum wall thickness of the oil separator vessel

Open the condensate sample valve at the side of the compressor for 5 seconds and dispose of the collected condensate according to local regulations for oil containing water

Re-open the test valve and collect the condensate in the test bottle

Compare the turbidity of the sample with the 15 ppm turbidity reference bottle

Is the turbidity of the test sample more intense than the reference turbidity?

If the turbidity of the test sample is more intense than the reference turbidity, a request for servicing should be initiated, to be carried out within 2 weeks time.

Notes on the condition of the condensate

Sign off on the condensate check

Warning: Depressurise the compressor before removing the valve

Safety valve unscrewed one or two turns and retightened

Compressor depressurised before valve removal

Safety valve tested on a separate air line

Safety valve opens at the set pressure stamped on the valve

Warning: No adjustments are allowed. Never run the compressor without safety valve

Sign off on the safety valve testing