BUSCH 7180551, Installation And Maintenance Instructions Manual

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that an explosive mixture is present inside the pump. This is
generally done by flushing the pump with a non-explosive gas,
such as air or nitrogen, whilst the pump is stopped and its inlet
closed.
Inerting process:
–
Close the pump inlet (suction valve)
–
Feed non-explosive gas through the flushing gas connection on
the suction side
–
Non-explosive gas volume flow: NC 400 B:
³
100 litres/min.
–
Inertise for 200 seconds, after that the gas supply can be shut off
and the inerting is completed
l After inerting, the pump can be started.
l On starting the motor, major vibrations can briefly occur.
Consequently, a possible alarm of the vibration pickup SA up to 10
seconds after starting the motor does not need to be taken into
consideration.
l Operation
u During operation, the pump runs continually. No other
connection will be activated.
u The vacuum pump has to be stopped immediately if one of the
monitoring elements exceeds the set value defined in the
relevant chapters, see below.
l Obligatory minimal surveillance for vacuum pumps
certified
Inside (i) II 2G Ex h IIB T3 Gb X
Outside No ATEX Zone
–
Cooling liquid temperature TS
–
Vibrations of the pump SA
–
Cooling liquid level switch LS
l The customer must operate the vacuum pump in accordance with
explosion protection regulations.
l Switch on the vacuum pump
Switching off the vacuum pump
l Stopping the vacuum pump
u Before switching off the vacuum pump, the inside of the
vacuum pump must be inertised if it cannot be excluded that
an explosive mixture is present inside the pump. For the
inertisation process, the vacuum pump must be operated a
certain time during which it will be flushed with a
non-explosive gas. This can be done with non-explosive
ambient air by opening the pump inlet, or with the help of the
optional liquid purge.
l Inerting process :
–
Run the pump
–
Close the pump inlet after the end of the process or when a
monitoring device has sent an alarm (valve at suction side)
–
Feed non-explosive gas through the flushing gas connection,
suction side
–
Non-explosive gas volume flow: NC 400 B
³
100 litres/ min.
–
Inertise for at least 200 seconds, after that the gas supply can be
shut off and the inerting process is completed
Switch off the pump, close the valves
u
In case of build-up of condensates inside the pump due to the
process, the time for inerting should be extended to a
minimum of 10 minutes, which will dry the pump.
l Switch off the pump
l
Make sure that the system is completely disconnected from the
power supply
Maintenance
DANGER
In case the vacuum pump has conveyed gases that have been
contaminated with foreign materials that are dangerous to health,
the oil and condensates will also be contaminated.
These foreign materials can infiltrate the pores, recesses and other
internal spaces of the vacuum pump.
Danger to health when the vacuum pump is dismantled.
Danger to the environment.
Always wear protective clothing when carrying out maintenance
work.
Before any maintenance work, the inlet and outlet piping as well as
the vacuum pump itself must be flushed with nitrogen.
General information
Please observe the following indications and maintenance instructions:
WARNING
After start-up, the vacuum pump has to be checked every day for
any unusual noise. In such a case, immediately stop the pump, see
paragraph “Troubleshooting”
.
WARNING
The inside of the vacuum pump should be regularly checked for
any build-up of deposits. If deposits occur, they must be removed,
e.g. by flushing the pump. The build-up of deposits can provoke
friction and sparks within the pump which must imperatively be
avoided. Danger of explosion!
Inspection possibilities exist at the inlet and outlet of the vacuum
pump. The use of an endoscope for better inspection is
recommended.
DANGER
Any servicing on the pump must only be carried out by specially
trained servicing staff under strict adherence to current and valid
safety regulations. In case of possible risk from dangerous
substances of any kind, the end user of the pump must duly inform
and instruct maintenance staff before any work is carried out.
Before any maintenance work is carried out, any risk to the health
of maintenance staff that could come from drawn substances or
any other substance both within or outside the pump, must be
excluded.
WARNING
The opening of the vacuum pump is only authorised after it has
been stopped and in the total absence of any explosive
atmosphere.
WARNING
The bearings have to be replaced every 24'000 operating hours as a
bearing breakdown would increase the danger of explosion.
Other work such as dismantling or rebuilding jobs as well as repair and
maintenance work may only be carried out by specialised BUSCH
service staff.
Maintenance
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