Chlorine Extraction - Grundfos Vaccuperm VGA-111 Installations- Und Bedienungsanleitungen

Checking the pressure connections (after change of
container)
1. Open the container valve and immediately close it again.
2. Open the flexible plastic bottle filled with ammonia water.
3. Slightly press the bottle in a pumping manner, allowing the
ammonia mist to rise up. Slowly pass the open ammonia
bottle along gas-leading parts.
4. If white mist forms, the pressure connection is leaky.
Fig. 14 Ammonia and chlorine gas form white mist
5. Depressurise the system.
6. Eliminate the leakage.
7. Repeat the tightness check.
8. If no white mist forms, the pressure connection is tight.
Fig. 15 Pressure connection is tight
Checking the inlet valve
1. Loosen the union nut at the overpressure connection of the
vacuum regulator, and remove the overpressure line.
2. Close the inlet valve.
3. Open the chlorine container valve.
4. Open the flexible plastic bottle filled with ammonia water.
5. Slightly press the bottle in a pumping manner, allowing the
ammonia mist to rise up. Slowly pass the open ammonia
bottle along gas-leading parts.
6. If white mist forms, the inlet valve is leaky.
7. Depressurise the system.
8. Check the inlet valve and repair it.
9. Repeat the tightness check.
10. If no white mist forms, the inlet valve is tight.

6.2 Chlorine extraction

6.2.1 Connecting the chlorine container
Chlorine containers must be stored at least for 8 hours in the
container room, so that the content can adapt to the ambient
temperature.
Warning
Chlorine containers must not have a higher
temperature than other parts of the system. Danger
of liquefaction and escape of chlorine!
1. Turn chlorine drums on their support, until the dip pipe and the
riser pipe are placed vertically (observe the markings on the
drum).
2. Protect chlorine containers from turning over or rolling away.
3. Dry the piping and the extraction system with dry nitrogen or
dry air.
4. No foreign matter must get into the system.
5. Provide the pressure connection with a new gasket.
6. Connect the chlorine container. When using drums, observe
that the lower valve is normally intended for the extraction of
liquid chlorine.
7. Slowly open the container valve.
6.2.2 Container valves
Operate the valves at the chlorine containers only manually
without force. Close the valves of full or empty chlorine containers
with closing nut (marked chlorine or Cl
Warning
Do not open container valves using force!
Stuck valves
Stuck valves can be loosened by wrapping a cloth with warm
water around the valve. If this is not possible, return the container
to the manufacturer.
• Never use an open flame to heat up the valve!
• Never use wrench lengthening!
6.2.3 Checking the tightness
Before start-up, check the tightness of the entire system,
see section 6.1 Checking the tightness.
6.2.4 Chlorine extraction
Do not completely evacuate the chlorine container.
A residual pressure of approx. 2 bar must remain in
the container for the following reasons:
To avoid penetration of humidity, which will cause
Caution
corrosion.
To avoid withdrawal of chlorine gas pollutants, which
will cause clogging of the pressure reducing valve in
the long run.
Chlorine gas extraction
At 15 °C about 1 % of the content of a container can
be extracted per hour.
Caution
When extracting more, there is danger of formation
of ice on containers and piping, which will cause
malfunction.
The table shows the maximum extraction quantity depending on
the used container size.
Container Container size [kg]
50
Cylinder
65
500
Drum
1000
In case of higher chlorine requirement, several chlorine
containers of the same temperature have to be connected with
header lines.
Extraction of liquid chlorine
With chlorine gas dosing systems, the extraction of liquid chlorine
is only possible from chlorine drums. The valve on the dip pipe of
the drum must be connected, and an evaporator must be used.
6.2.5 After chlorine extraction
In order to avoid the penetration of humidity causing
Caution
corrosion, close the connecting lines directly after
chlorine extraction.
1. If the container is emptied down to a residual pressure of
2 bar, the container valve must be closed, in order to avoid
withdrawal of pollutants or penetration of humidity.
2. Disconnect the container from the system.
3. Mount the protective nut on the valve.
4. Mount the protective cap.
) and gasket.
2
Extraction quantity
[g/h]
max. 500
max. 650
max. 5000
max. 10000
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