System With Internal Bypass Pump; System With External Booster Pump And Load Unit; System With Solenoid Valve/Ball Valve (Batch Tank) - Grundfos Oxiperm OCD-164 Manual De Instalación Y De Mantenimiento

5.4.2 System with internal bypass pump

As an option, the system can be delivered with an internal bypass
pump instead of the solenoid valve. This version is required for
treating closed water circuits, i.e. the sampling of dilution water
and the addition of chlorine dioxide solution are present in the
same water circuit.
The bypass pump is only designed for compensation of the
internal friction losses of the system, and for counteracting the
pressure losses of approx. 0.1 bar in the solution line to the
injection unit.
The solution line to the injector should therefore be kept as short
as possible. The geodetic difference in height between the
connection of the solution line and the injection unit must not
exceed 1 m.
Fig. 8 System with bypass pump, installation scheme

5.4.3 System with external booster pump and load unit

An external booster pump can be connected to the dilution water
line as a further option. This version is required, if sampling of the
dilution water and addition of the chlorine dioxide solution are not
in the same water circuit, and the system pressure at the injector
is higher than the pressure of the dilution water supply line. In this
version, a load unit is required in addition, and is controlled
directly by the system electronics, see fig. 42.
Booster pump and load unit must be selected
Note
separately (see section 11. Accessories).
Fig. 9 System with booster pump, installation scheme

5.4.4 System with solenoid valve/ball valve (batch tank)

As a further option, the dilution water line can also be selected
with a solenoid valve and dosing ball valve.
This version is required if batch mode is present, i. e. a certain
concentration of ClO is prepared in a tank. Dosing of the ClO
2
solution to the injection unit is carried out using dosing pumps.
The concentration of the ClO
2
adjusted from 2 to 3.3 g/l.
The set pressure must be adjusted to the local conditions during
startup. The pressure retention valve must be set such that
siphoning does not take place through emptying of the solution
line when the system is switched off.
If the pressure set on the loading valve is too high, it
may occur that the required quantity of bypass water
Note
cannot be correctly set.
If the bypass water is not free from solids, a dirt filter
Note
should be installed upstream.
Fig. 10 System with solenoid valve and ball valve
solution in the tank can be
2
15