8 Decommissioning
8.1 Shutting down for longer periods
Before shutting down the vacuum pump, observe the following instructions to adequately protect the in-
terior of the vacuum pump (suction chamber) from corrosion:
Shutting down the vacuum pump
1. Switch off the vacuum pump.
2. Vent the vacuum pump.
3. Allow the vacuum pump to cool down.
4. Clean suction chamber.
5. Change the lubricant.
6. Seal the vacuum and fore-vacuum flange and any other openings with the original screw caps.
7. Evacuation of the pump interior via the measurement connection on the vacuum side, to p < 1
hPa.
8. Fill the suction chamber with nitrogen.
9. Store the vacuum pump in dry, dust-free rooms, within the specified ambient conditions.
10. In rooms with damp or aggressive atmospheres, you should package the vacuum pump in a plas-
tic bag together with a drying agent, and seal it so that it is airtight.
11. For storage durations longer than 2 years, we recommend you carry out maintenance and a lubri-
cant change prior to recommissioning.
12. Please note, the vacuum pump may not be stored in the vicinity of machines, traffic routes, etc.,
as strong vibrations may damage the bearing.
8.2 Recommissioning
NOTICE
Damage to the roots pump due to aging of the lubricant
The useful life of the lubricant is limited (max. 2 years). Prior to recommissioning, following a shut-
down of
2 years or more
, carry out the following work.
► Observe the maintenance instructions – consult Pfeiffer Vacuum if necessary.
► Change the lubricant.
► Check the bearing and if necessary, change the critical elastomer parts.
Control work before re-commissioning
1. Check the roots pump for visible damage and put the roots pump into operation only if it is in a
correct state.
2. Perform a visual inspection of the pump inner chamber.
3. If drying pearls were inserted in the suction chamber then they should be removed now.
4. If there is evidence of rust on the parts which form the housing then do not put the roots pump into
.
5. If necessary, subject the roots pump to a leak test before re-commissioning.
8.3 Disposing of the vacuum pump
WARNING
Health hazard through poisoning from toxic contaminated components or devices
Toxic process media result in contamination of devices or parts of them. During maintenance work,
there is a risk to health from contact with these poisonous substances. Illegal disposal of toxic sub-
stances causes environmental damage.
► Take suitable safety precautions and prevent health hazards or environmental pollution by toxic
process media.
► Decontaminate affected parts before carrying out maintenance work.
► Wear protective equipment.
Decommissioning
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