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| Operation Manual C 2213 | Installation
5.1.4 Simultaneous delivery under vacuum
In order to make sure that the cylinders are emptied uniformly under vacuum several conditions must be
provided:
Sufficient chlorine delivery
The delivery rate per cylinder should not be lower than 200g/h. Please be especially careful during night
operation in swimming pools. In many cases both cylinder batteries are designed according to the highest
delivery rate to be expected. As a result, the delivery rate per cylinder under normal operation conditions often
falls below 200 g/h. By using collective pipes with short-circuit lines the number of cylinders per battery can be
divided in two.
Fig. 5: Schematic diagram of a double sided vacuum battery sampling
For a shock chlorination the short-circuit lines are opened and both cylinder batteries simultaneously will
deliver chlorine gas.
Uniform cylinder pressure
As the cylinder pressure directly depends on the temperature, the temperature must be equally high in all
cylinders. So please make sure that the cylinders are not located near an radiator or close to a window where
they are exposed to direct sunlight. As the cylinder temperature falls down slower or faster depending on the
filling capacity, the chlorine cylinders must be filled uniformly when starting parallel supply.
5.1.5 Comments regarding chlorine drums
At higher metering capacities chlorine drums are often used. Depending on the ambient temperature, up to
7 kg/h chlorine gas may be supplied from a 1,000 kg drum (10°C:3kg/h, 15°C:5kg/h, 20°C:7kg/h). Chlorine
drums are equipped with two connections, one for gaseous chlorine supply and one for liquid chlorine supply.
For more information on which connection is suitable for which mode of delivery, contact the supplier. In some
countries, valves may be situated at the top. These are designed for an extraction of liquids. In the following
picture, you see an example of a German drum.
①
②
③
Fig. 6:
①
Extraction in form of gas,
②
marking on the drum,
③
extraction in form of liquid.
