25GA01208_002_C0 - 11/2016 - © Leybold
Operation
4.3 Operation
If exhaust gases must be collected or contained, do not allow the exhaust
line to become pressurised. The pressure in the oil box must not exceed
0.5 bar (g). An exhaust line which is too small in diameter or which is
blocked can result in the formation of overpressures within the pump.
Possible consequences can be a damaged or even burst open pump.
Thus the exhaust line must be checked from time to time to ensure that
there are no obstructions.
4.3.1 Pumping of Non-Condensable Gases and Vapours
If the process contains mainly permanent gases, the TRIVAC-B-DOT may be
operated without gas ballast (position 0), provided that the saturation vapour
pressure at operating temperature is not exceeded during compression.
If the composition of the gases to be pumped is not known and if
condensation in the pump cannot be ruled out, run the pump with the gas
ballast valve open and with dry inert gas in accordance with Section 4.3.2.
4.3.2 Pumping of Condensable Gases and Vapours
With the gas ballast valve open (position I) and at operating temperature,
TRIVAC-B-DOT pumps can pump pure water vapour up to the water vapour
tolerance specified by the technical data. If the vapour pressure increases
above the permissible level, the water vapour will condense in the oil of the
pump.
When pumping vapours ensure that the gas ballast valve is open and that
the pump has been warmed up for approximately 30 minutes with the intake
line closed.
Pumping of Vapours
Vapour phases may only be pumped up to the permissible limit after the
pump has attained its operating temperature.
During pumping, vapours may dissolve in the oil. This changes the oil
properties and thus there is a risk of corrosion in the pump. Therefore,
don’t switch off the pump immediately after completion of the process.
Instead, allow the pump to continue operating with the gas ballast valve
open and the intake line closed until the oil is free of condensed vapours.
We strongly recommend operating the TRIVAC-B-DOT in this mode for
about 30 min utes after completion of the process.
In cyclic operation, the TRIVAC-B-DOT should not be switched off during the
intervals between the individual working phases (power consumption is mini-
mal when the pump is operating at ultimate pressure), but should continue to
run with gas ballast valve open and intake port closed (if possible via a valve).
Once all vapours have been pumped off from a process (e.g. during drying),
the gas ballast valve can be closed to improve the attainable ultimate
pressure.
WARNING
NOTICE
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