Operating and Maintenance Manual 09/2019 – part I
Screw compressors
32
When the pressure difference between the compressed air and oi
0.1 MPa, change the separator, irrespective of the number of hours of
operation.
In the BERG screw compressors there are used two types of oil separators: internal one
(fig. 16).
External oil separator maintenance procedure:
- Stop the compressor and close the pressure conduit valve.
- Switch off the power supply and take measures to prevent it from being unintentionally
switched on again by unauthorised persons.
- Verify that the machine has been de-energised (0 V).
- Wait minimum 5 minutes and then open the compressor cover.
- Check that the system has been emptied by slowly unscrewing the oil filler cap (use
protective clothing) (Fig.10). The compressed air can be hot.
- Unscrew the oil separator using the same spanner as for oil filter; the separator is
unscrewed counter clockwise.
- Before screwing the new separator in, apply a little oil onto the separator seal. Then screw
it by hand into the coupling without using any tool.
- Start the compressor and check for leaks.
Internal oil separator maintenance procedure:
- Stop the compressor and close the pressure conduit valve.
- Switch off the power supply and take measures to prevent it from being unintentionally
switched on again by unauthorised persons.
- Verify that the machine has been de-energised (0 V).
- Wait minimum 5 minutes and then open the compressor cover.
- Check that the system has been emptied by slowly unscrewing the oil filler cap (use
protective clothing) (Fig.15). The compressed air can be hot.
- Disconnect the pressure conduit from the minimum pressure valve, unscrew the oil tank
cover and remove the separator cartridge. Caution: Hot oil.
- Install the new separator cartridge with the seal, screw the oil tank cover and reconnect the
pressure conduit.
- Fasten the earth bolt securely to the tank cover.
- Start the compressor and check for leaks.
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