Operation; Switching On The Chlorine Gas Dosing System; Setting The Dosing Flow; Reading The Dosing Flow - Grundfos Vaccuperm VGA-113 Montage- Und Betriebsanleitung

6.2.4 Chlorine extraction
Do not completely evacuate the chlorine container.
Caution
A residual pressure of approx. 2 bar should remain in
the container for the following reasons:
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
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.
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, 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
Extraction quantity
[g/h]

7.2 Setting the dosing flow

To increase the dosing flow, turn the adjustment knob very slowly
max. 500
counter-clockwise.
max. 650
max. 5000
max. 10000
To reduce the dosing flow, turn the adjustment knob very slowly
clockwise.
Pos. Description

7.3 Reading the dosing flow

The dosing flow is read at the top of the ball in the measuring
glass.
adjustment knob (1), until the ball in the measuring glass
indicates the desired gas flow.
If the dosing flow is adjusted via an external
controller, no adjustment can be made at the dosing
Note
regulator.
See also the manual of the external controller.
If the maximum dosing flow is reached, don't turn the
Caution
adjustment knob any further, because there is no
locking.
1
Fig. 24 Setting the dosing flow
Turning the adjustment knob counter-clockwise will
1
increase the dosing flow.
Turning the adjustment knob clockwise will reduce the
2
dosing flow.
lbs/day
Fig. 25 Reading the dosing flow
The scale of the measuring glass is adjusted to a gas
temperature of 20 °C.
Note
In case of extremely different temperatures the
dosing flow may differ from the value being shown.
2
g/h
21