Grundfos Oxiperm OCD-164, Installation And Operating Instructions Manual

Page: 13 / 528

English (GB)
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4.3.1 How the system operates in batch mode
In batch mode, a defined ClO
2
solution is added to a holding tank
(batch container), and transported to the injection units by means
of dosing pumps.
The ClO
2
concentration can be adjusted within a range of 0.5 to
3.3 g/l.
Fig. 5 Preparation of chlorine dioxide solution
For a concentration between 2 and 3.3 g/l, the quantity of bypass
water is set via a dosing ball valve. In the case of concentrations
below 2 g/l, the required quantity of bypass water for a 2 g/l
solution is set. The desired concentration inside the solution
container is then achieved by regulating the two dosing pumps.
The limits for the bypass water quantity are -50 % and +20 % of
the target value. If the target value is undershot (up to -50 %), the
system will automatically regulate the dosing flow of the chemical
pumps for the current water quantity. This is achieved by means
of a pulse-pause control on the dosing pumps. When the water
quantity target value is undershot, the overall performance of the
system is reduced by up to -50 %.
This control makes it possible to compensate pressure
fluctuations in the bypass pipe.
5. Installation
5.1 Transport and storage
• Transport system carefully.
• Dry, cool storage location.
• Protect from direct sunlight.
5.2 Unpacking
• The system is tested at the factory and ready for connection.
• Check for damage, do not install or connect a damaged
system!
• When unpacking, look for loosely packed components.
• Install as soon a spossible following unpacking.
5.3 Installation location
The installation location for the system must fulfil the following
requirements:
• The permissible ambient temperature of +5 to +40 °C must be
guaranteed.
• The installation location must be vibration-free and isolated
fireproof from other rooms.
Note
A set of warning signs for the chlorine dioxide system
in accordance with the specifications is available
under Order No 96727022 (515-662).
Please find further general information for operation
of a chlorine dioxide system in:
– Accident prevention regulations "Chlorination of
water" (VGB 65 or GUV 8.15)
– Directive on dangerous working materials
– DIN 938 "Sodium chlorite solution for water
treatment; technical conditions of delivery"
– DIN 939 "Hydrochloric acid for water treatment"
– "Chlorine dioxide for water treatment" DVGW
directive, worksheet W 224 (German)
TM
04
81
97
45
10
Warning
Protection units should be provided in addition, such
as separate collecting trays for the hydrochloric acid
and sodium chlorite tanks.
Protective clothing for operators has to be provided.
Furthermore, the specified warning signs, danger
information and first aid information must be
positioned at the specified points.
Bypass water
Reactor
ClO
2
solution
ClO
2
HCl
NaClO
2
Warning
Only transport the system, when it's empty, observe
the weight.
Only use suitable lifting and transport equipment.
Note
Retain packaging material, of dispose of according to
local regulations.
Note
The applicable local or country-specific regulations
must be observed when selecting and designing the
installation location for the chlorine dioxide system.
In Germany, the accident prevention regulations UVV
are applicable.
Caution
Reference to the dangers when using the chlorine
dioxide system and to the relevant precautionary
measures must be provided using appropriate signs
at access points to the system rooms and to the
associated chemical storage rooms.