6.4 Flushing the suction chamber
NOTICE
Property damage from impermissibly high pressure build-up in the suction chamber
Exceeding the specified flushing quantities damages the vacuum pump.
► Observe the maximum permissible flushing quantities at max. 3000 hPa.
► Fully purge all supplied fluid.
► Observe the vapor compatibility of the downstream vacuum pumps.
If the extracted medium polymerizes or becomes deposited in the suction chamber, a continuous or dis-
continuous flushing of the suction chamber can be performed during operation.
Procedure
1. Consider the components in contact with a medium when selecting a solvent compatible with the
process medium.
– Components contained in the suction chamber are cast iron and steel. Seals are FPM.
2. Select the max. permissible flushing quantity according to the below table.
– For pumping stations without intermediate condenser or collection receptacles, the smallest
vacuum pump in the pumping station determines the fluid quantity.
3. Set the desired flushing quantity at the inferential meter.
4. After flushing, sufficiently dry the vacuum pump on the inside.
Pump type
max. flushing quantity
Okta 500 G
0.5 l/min
Okta 1000/1500G
1.0 l/min
Okta 3000/4000 G
1.5 l/min
Okta 8000 G
2.0 l/min
Tbl. 6:
Max. permissible flushing quantity
6.5 Switching off and venting
WARNING
Risk of crushing on rotating parts when reaching into the open flange
The pistons continue to run in the vacuum after switching off the motor, and can trap fingers and
hands within their reach.
► Wait until the vacuum pump comes to a complete standstill.
► Secure the vacuum pump against re-start.
NOTICE
Property damage from impermissibly high sealing gas pressure
Excessive sealing gas pressure leads to damage to the seals after switching on the vacuum pump.
► Observe the max. permissible sealing gas pressure.
► Reduce the sealing gas pressure to < 1200 hPa.
► Stop the sealing gas supply immediately after switching off the vacuum pump.
Procedure with clean processes
You can switch off the vacuum pump in every pressure range, between atmospheric pressure and ulti-
mate pressure directly after the process end.
1. Close the shut-off valve in the vacuum line and disconnect the vacuum pump from the process.
2. Switch off the vacuum pump.
3. Vent the vacuum pump via the intake side.
4. Make sure that you do not vent the vacuum chambers through the vacuum pump.
Operation
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