10 Decommissioning
10.1 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:
Procedure for a longer downtime of the vacuum pump (> 1 year)
1. Allow the vacuum pump to cool down.
2. Clean suction chamber.
3. Change the lubricant.
4. Drain the cooling water and empty the cooling water chambers.
5. Seal the vacuum flange and fore-vacuum flange and any other openings with screw caps.
6. Evacuate the pump interior via the measurement connection on the vacuum side, to p < 1 hPa.
7. Fill the suction chamber with nitrogen.
8. Store the vacuum pump in dry, dust-free rooms, within the specified ambient conditions.
9. 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.
10. For storage durations longer than 2 years, we recommend you carry out maintenance and a lubri-
cant change prior to recommissioning.
11. Please note, the vacuum pump may not be stored in the vicinity of machines, traffic routes, etc.,
as strong vibrations may damage the bearing.
10.2 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, carry out the follow-
ing operations following inactivity of
2 years or more
:
► Observe the maintenance instructions – consult Pfeiffer Vacuum where necessary.
► Change the lubricant.
► Check the bearings and replace any aged elastomer parts.
Procedure when recommissioning the vacuum pump
1. Check the roots pump for visible damage and operate the roots pump only in an appropriate oper-
ating status.
2. Check the interior of the pump for contaminants.
3. Remove any drying pearls from the suction chamber.
4. Do not operate the vacuum pump if there is evidence of rust on the parts which form the housing.
5. Perform a leak test prior to recommissioning the vacuum pump as required.
Decommissioning
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