Grundfos VGA-113, Installation And Operating Instructions Manual

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English (GB)
21
6.2.4 Chlorine extraction
The residual pressure in the container will avoid:
• the penetration of humidity, which will cause corrosion
• the withdrawal of chlorine gas pollutants, which will cause
clogging of the pressure reducing valve in the long run.
Chlorine gas extraction
The table shows the maximum extraction quantity depending on
the used container size.
In case of higher chlorine requirement, several chlorine
containers of the same temperature have to be connected with
header lines.
6.2.5 After chlorine extraction
1. If the container is emptied, the container valve must be
closed, in order to avoid the 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.
7. Operation
The dosing flow is adjusted at the rate valve of the dosing
regulator. In versions with optional servomotor the dosing flow
can also be adjusted via an external controller with servomotor.
7.1 Switching on the chlorine gas dosing system
1. Close the rate valve at the dosing regulator.
2. Open the shut-off valve at the injection unit.
3. Open the motive water valves.
4. Open the motive water supply of the injector.
5. Open the chlorine container valve.
6. Slowly open the rate valve of the dosing regulator using the
adjustment knob (1), until the ball in the measuring glass
indicates the desired gas flow.
7.2 Setting the dosing flow
To increase the dosing flow, turn the adjustment knob very slowly
counter-clockwise.
To reduce the dosing flow, turn the adjustment knob very slowly
clockwise.
Fig. 24 Setting the dosing flow
7.3 Reading the dosing flow
The dosing flow is read at the top of the ball in the measuring
glass.
Fig. 25 Reading the dosing flow
Caution
Do not completely evacuate the chlorine container.
A residual pressure of approx. 2 bar should remain in
the container for the following reasons:
Caution
At 15 °C about 1 % of the content of a container can
be extracted per hour.
When extracting more, there is danger of formation
of ice on containers and piping, which will cause
malfunction.
Container Container size [kg]
Extraction quantity
[g/h]
Cylinder
50 max. 500
65 max. 650
Drum
500 max. 5000
1000 max. 10000
Caution
In order to avoid the penetration of humidity causing
corrosion, close the connecting lines directly after
chlorine extraction.
Note
If the dosing flow is adjusted via an external
controller, no adjustment can be made at the dosing
regulator.
See also the manual of the external controller.
Caution
If the maximum dosing flow is reached, don't turn the
adjustment knob any further, because there is no
locking.
T
M
04
07
54
39
11
Pos. Description
1
Turning the adjustment knob counter-clockwise will
increase the dosing flow.
2
Turning the adjustment knob clockwise will reduce the
dosing flow.
TM
04
07
17
09
08
Note
The scale of the measuring glass is adjusted to a gas
temperature of 20 °C.
In case of extremely different temperatures the
dosing flow may differ from the value being shown.
1
2
g/h lbs/day