Commissioning
Inspecting the vacuum system
19
© Lutz-Jesco GmbH 2016
Subject to technical changes.
160426
Vacuum Regulator for Chlorine Gas
C 2700-V
Operating Instructions
BA-21210-02-V05
5.
Carry out the leak test again.
6.
Close the chlorine container valve and suction off the chlorine using
the injector.
Leak test with chlorine carried out.
7.2 Inspecting the vacuum system
Tightness of the vacuum system is inspected together with the dosing
device.
7.2.1 Carry out the leak test on the vacuum system
Precondition for action:
The vacuum system is completely installed.
All the open connections of the vacuum system were closed.
The injector is ready for operation.
Perform the following working steps:
1.
Connect the chlorine supply to, for example, the chlorine container
valves or to a valve in the vacuum regulator supply line.
2.
Open the valves on the dosing device to adjust the dosing quantity.
3.
Switch on the injector and wait until the vacuum meter on the
dosing device displays at least 0.5 bar underpressure.
4.
Switch off the injector.
The vacuum must stay unchanged for at least five minutes.
5.
If the vacuum collapses quickly, eliminate the leak (see 7.2.2
”Localising leakages in the vacuum system“) and repeat the check
on the vacuum system.
Vacuum system leak test carried out.
7.2.2 Localising leakages in the vacuum system
Leaks in the vacuum system are localised with the help of compressed
air or nitrogen at a slight positive pressure and a soap solution.
Precondition for action:
When checking the tightness of the vacuum system, a leak was
detected.
The vacuum system is fully assembled.
All the open connections of the vacuum system were closed
correctly.
The valves on the chlorine supply have been closed.
If the system was previously operated with chlorine, the residual
chlorine has been extracted with the injector and the system oper-
ated for approx. 5 minutes using nitrogen or dry compressed air.
The injector was switched off.
1.
Close the water valves upstream and downstream of the injector.
2.
Connect the supply of nitrogen or dry compressed air to the vacuum
system.
3.
Slowly increase the system pressure to approx. 0.2 – 0.4 bar (at
significantly higher positive pressures, the safety valve in the
vacuum regulator will open).
4.
Apply soap solution to all the potential leaks.
Bubbles will appear at leak locations.
Leakage in the vacuum system localised
7.3 Switching the system on
The vacuum regulator does not need to be operated separately. If there
is a sufficient vacuum and supply of chlorine, the device opens and, if
the vacuum is not sufficient, the device stops the flow of chlorine gas.
NOTICE
Operational disturbances due to leaks in the vacuum
system
In normal operation, you cannot detect minor leaks in the vacuum
system since no chlorine escapes. Humid air, however, enters the
system. Together with the chlorine, the humidity can cause build-
ups and operational disturbances.
With the injector switched off, there may be a slight chlorine smell.
Carry out a proper inspection of the vacuum system.
Ensure that all action is taken only by personnel with sufficient
and corresponding qualifications.
Some dosing devices feature a valve which protects the
injector from excessive vacuums. If, for example, this vacuum
is set to an underpressure of 0.4 bar, an underpressure of 0.5
bar cannot be reached during the leak test.
i
NOTICE
Damage to the plant due to excessive pressure
When using positive pressure to localise leaks, components in the
vacuum system, e.g. membranes or springs, may be mechanically
overloaded.
Use a maximum positive pressure of 0.5 bar.
