Inerting Process; Running; Empty Running; Liquid Flushing Procedure - BUSCH COBRA NC 0100 B Manuel D'installation Et De Maintenance

Inerting process:

l Close the pump inlet (suction valve MV1)
l Feed non explosive gas through the flushing gas connection,
suction side
l Non explosive gas volume flow:
u NC 0100 B : ³ 25 liter/ min
u NC 0200 B : ³ 40 liter/ min
u NC 0300 B : ³ 75 liter/ min
l Inertise during 200 seconds, then the gas supply can be closed and
the inertisation is finished
After the inerting, the pump can start. The seal on exhaust side has to
be continually supplied with a barrier gas, e.g. air or nitrogen.
On starting the motor, some important vibrations of the pump can
briefly occur. Consequently, a possible alarm of the vibrations pickup
(SA+/ 0701) up to 10 seconds after the motor starting should not be
considered.
For a faster warming of the pump, further flushing gas can also be
supplied. After the running temperature is reached, the suction valve
MV1 can be released and open by a signal of the temperature probe
TS+/ 0102.

Running

During the running, the pump can turn continually, this in so far as no
alarm is activated.
The customer must operate the pump in accordance with explosion
protection regulations.

Empty running

Before the cut-off of the vacuum pump, the vacuum pump must be
inertised inside, when it could not be excluded that an explosive
mixture is present inside the pump. For the inerting, the vacuum pump
must run a certain time, during which a flushing with non explosive gas
is executed.
Inerting process:
l Let run the pump
l Close the pump inlet (suction flange MV1)
Description
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l Feed non explosive gas through the flushing gas connection,
Flushing gas
connection
l Non explosive gas volume flow :
l Inertise during at least during 200 seconds, then the gas supply
l Cut-off the pump, close the solenoid valves MV2, MV3, MV5,
In case of condensate formation bound to the process, the time of the
inerting should be extended of minimum 10 minutes. Such a way, the
pump will be dry.
On switch off the motor, some important vibrations of the pump can
briefly occur. Consequently, a possible alarm of the vibrations pickup
(SA+/ 0701) should not be considered.
Depending on the liquid purge medium, the optional liquid purge
should take place at a reduced speed (10 Hz) and after the inerting.
The empty pump works with internal compression and can therefore
only take a limited amount of fluid, which is determined by the pipe
section.

Liquid flushing procedure :

l Inertise the pump
l Let run the pump (max. 10 Hz)
l Close the pump inlet after the end of process (suction flange MV1)
l Feed flushing liquid through the flushing liquid connection (MV4
l The flushing duration and quantity is dependent on the process
l Close MV4 after the liquid flushing
l Dry the pump with flushing gas minimum 10 minutes, see inerting
l Switch off the pump, close all solenoid valves
suction side
u NC 0100 B : ³ 25 liter/ min
u NC 0200 B : ³ 40 liter/ min
u NC 0300 B : ³ 75 liter/ min
can be closed and the inerting is finished
MV7
open), suction side
and the experience
process
Flushing gas
connection
Flushing liquid
connection