The saturation ratio
The saturatlon ratio measured in mg/l is illustrated
in the diagram above. The diagram shows that water can
not dissolve any air at a temperature of 100°C and
an absolute pressure of 1.0 bar (a system pressure of
0 bar i .e. an open system) The solubility increases
as the pressure increases and the temperature decreases.
It is however possible for air/oxygen to enter into
and saturate the system water due to phenomena such
as balancing forces, local negative pressures etc. Degassing
in a process of successive pressure reductions is thus
not the same as conventionai outgassing. An efficient
degassing process can replace many of the conventionai
venting points.
Installation directions
Pipes/tubing between the degasser and the main pipe
shall if possible be directed upwards. Venting will
then occur automaticaliy.
1. Cut in shall be made to horizontal pipes, but
not on the upside or on the underside.
2. For connection to the header pipe there shoud
be two sleeves, R20 including cut-off valves and sealed
casings.
3. Check that the direction of the flow in the
header pipe complies with instructions. It is for example
strictly prohibited to connect the return pipe ahead
of the degasser supply. The piping between the degasser
and the header pipe shall be as short as possible and
maximum 4m.
4. The degasser can be connected anywhere to
the system but shall preferably be connected to a section
in which the flow does not vary.
Emptying the magnetic filter
In addition to the degassing function, PRE-V can be
equipped with a, so called, magnetic filter function.
Before emptying the magnetic filter the pump shall be
turned off, the cut-off valves towards the main system
be closed and the magnetic device be removed. The magnetic
filter consists of a vertical continuous pipe made of
a non-magnetic material (SS 2343). It is mounted in
the degasser after the intake valve. It is equipped
with a draining valve for sludge disposal etc. In the
center part of the magnetic filter there is an inner
pipe on the surface of which the magnetic particles
are caught. Inside the pipe there is a magnetic device,
which must be removed when emptying the filter. This
is accomplished by using the appertaining chain. It
is important to keep the magnetic device away from electronic
equipment etc. |
