EN – 41
ENMaintenance
Maintenance
Maintenance
frequency
Frequency Operating conditions
Oil
6 months “normal”, 24h per day
1 year “normal”, < 12h per day
Pump
1 year “normal”, 24h per day
2 years “normal”, < 12h par day
The frequency values are minimum values for «normal» operating conditions: pressure
< 1 mbar (0.75 Torr), clean and non-corrosive gas.
An incorrect ultimate vacuum or a reduction in pumping speed are signs that
the oil has deteriorated.
The periodic inspection of the state of the oil is performed by comparison with a
sample of new oil in order to check the level of contamination or deterioration of the
lubricant.
The frequency at which oil is renewed is adapted to the type of operation:
If the oil is cloudy, this indicates that condensables have been absorbed during
pumping. The oil can be regenerated using the gas ballast (see page 31).
A thickening of the oil, together with a blackish color and a “burnt” smell indicate
that the oil has deteriorated. Drain the pump and flush it.
When the lubricating oil is expensive (fluorocarbon synthetic oils), the use of an oil mist
eliminator allows oil recovery after deposition.
The oil should be changed every 6 months. This value is given as a guide only.
It may be extended to 1 year if the ultimate vacuum required is sufficient (for roughing
pumps).
Similarly, if the pump is stopped frequently for long periods, the oil should
be changed at intervals of 6 months to a maximum of 1 year (oil may become
sticky).
Note: Every pumping operation is different. This oil must therefore be changed at
intervals adapted to each specific application.
The use of accessories (see page 14) can reduce the frequency of these maintenance
operations.
Roughing
Maintenance of the
accessoiries
When an adixen accessory is connected to the pump, periodically it is necessary to
make accessory overhaul.
Study the accessory user’s manual and make sure you follow the safety instructions
it gives regarding protection of personnel: operator could be in contact with process
residues on the exhaust which could cause severe injury or death. Ask your safety
department for instructions according to the local regulations.
When an oil mist eliminator is installed, check periodically at the exhaust
orifice that:
- the exhaust valve can move, so the exhaust is not blocked,
- the exhaust valve can move, no overpressure in the oil casing.
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