EN – 34
Note: these characteristics apply for pumps operating at a constant inlet
pressure (1 to 5 mbar): they are adapted for each case of pumping.
Start-up
Isolate the pump from the pumping line (
close the isolation valve at inlet
).
Start up the pump at ultimate vacuum. When it is hot, open the nitrogen purge and
adjust the flow.
Wait for the pump stabilization.
Open the inlet valve and pump on corrosive gases: check that the purge in running
during all the pumping time.
Using the two purges
simultaneously
(C2 series)
When the bubbler and the oil casing purge are used simultaneously, the gas flow rate
must be ajusted to suit the application and the installation.
The adjustment data
given in the table corresponds to the adding flow adjustment data.
Stop
Isolate the pump from the pumping line (
close the isolation valve
).
When pumping stops, allow the purge to operate for approximately 1 hour (
depending
on the quantity of pumped gas
) at ultimate vacuum, with the purge, in order to degas
the oil effectively and clean the pump with nitrogen to eliminate the traces of pumped
gases.
Stop the purge but let the pump running to avoid any condensation, or dampness
introduction that can react with pumped gases.
If the pump must be stopped, prepare it as described
on page 16
to store a pump
which has been used.
Purge and sensor
setting table
Purges for pumping condensable,
corrosive, and hazardous gases (cont’d)
Setting
Model
Item
Description
Neutral gas flow (l/h)
Pressure (bars)
T (°C)
Corresponding
absolute
pressure
(bar)
(indicative value)
mini
average
maxi
Starting Operating
Problem
2033
2063
C1/C2
1
Gas ballast purge
1200
1500
1500
1700
2000
2500
-
-
1.1 to 1.25
2033
2063
C1/C2
2
Oil casing purge
60
70
300
300
700
900
-
-
1.1 to 1.25
1.15 to 1.25
2033
2063
C2
3
Oil pressure sensor connection *
-
0.9
1.2 ± 0.1
< 0.8
-
-
2033
2063
C2
4
Purge - Bubbler
60
70
300
300
700
900
-
-
1.1 to 1.25
1.15 to 1.25
2033
2063
C2
5
Oil temperature sensor connection *
-
-
< 95 °C
-
* Sensors are customer supplied.
C2 Series
C1 series
Operation principle
