Reflex Servitec 35 Mode D'emploi Original page 33

Servitec 75 – 95
1 Degassing valve "DV"
2 Vacuum gauge "PI"
3 Control Touch controller
4 2-way motor control valve "CD" upstream of vacuum spray tube
5 2-way motor control valve "WV" upstream of vacuum spray tube
6 Ball control ball valve "PV" downstream of pump "PU"
7 Connection "WC" for the make-up
•
Input for gas-rich water from the make-up
8 Connection "DC" for degassing
•
Input for gas-rich water from the facility system
9 Connection "DC" for degassing
•
Degassed water outlet
10 Pressure switch "PIS"
11 Pump "PU"
12 Insufficient water switch
13 Feed and drain cock "FD"
14 Main switch
15 Vacuum spray tube "VT"
4.2.1 Type plate
The nameplate is attached below the screw cover of the controller. On it can be
found information about the manufacturer, the year of manufacture, the
manufacturing number and the technical data.
Information on the type plate
Type
Serial No.
Min. / max. allowable pressure PS
Max. allowable flow temperature of
system
Min. / max. working temperature TS Min./max. operating temperature (TS)
Year of manufacture
Max. system pressure
Meaning
Device name
Serial number
Minimum/maximum permissible
pressure
Maximum permissible flow temperature
of the system
Year of manufacture
Max. system pressure
Vacuum spray degassing — 01.04.2022-Rev. D
Information on the type plate
Min. operating pressure set up on
site
4.3 Function
The Servitec is suited for the degassing of water from the plant and make-up
water. It removes up to 90 % of the dissolved gases from the water. The
degassing operation uses timer-controlled cycles. A cycle comprises the
following phases:
•
Inject and pump down to create a vacuum
The feed "DC" of gas-rich water from the system to the vacuum spray tube
"VT" has been opened. Depending on the requirement, partial flows of the
gas-rich system water and the make-up water are atomised in the vacuum
spray tube via the lines "DC" and "WC". As less water is injected into the
spray tube than is fed back into the system from the vacuum spray tube via
the pump "PU", a vacuum is formed in the spray tube. The pump "PU"
continues pumping down to create a vacuum until the water saturation
pressure is reached. The vacuum is indicated at the vacuum gauge "PI".
The large contact surface of the atomised water and the gas saturation
gradient to the vacuum result in degassing of the water. The pump returns
degassed water from the vacuum spray tube to the system where it again
begins to dissolve gases. There it is able to dissolve gases again.
•
Discharge
The "PU" pump shuts off. The system continues to inject and degas water
in the "VT" vacuum spray tube. The water level in the vacuum spray tube
rises. The gases separated from the water are discharged via the "DV"
degassing valve.
•
Idling time
The gas has been discharged, the Servitec will remain idling until the next
cycle is started.
Sequence of a degassing cycle in the vacuum spray pipe "VT"
Example: Cooling water system ≤ 30 °C, System pressure 1.8 bar, "DC" system
degassing in operation, "WC" make-up degassing closed.
1 Inject and pump down to create
a vacuum
2 Inject and pump down to create
a vacuum
Degassing
The entire degassing process is hydraulically synchronised by the "PV" motor
adjustment apparatus and the Servitec controller. The system monitors the
operating states and displays them at the Servitec controller. The controller
provides 3 different degassing programmes and 2 different make-up variants for
selection and setting.
Degassing programmes
The device controller regulates the degassing process. The controller monitors
the operating states and outputs them to the display.
The controller provides 3 different degassing programmes for selection and
adjustment:
•
Continuous degassing
For continued degassing over several hours or days in a sequence of
degassing cycles without idling periods. This degassing programme must
be selected after commissioning and repairs.
•
Interval degassing
This comprises a limited number of degassing cycles. There is an idling
time between the intervals. This degassing programme must be selected
for continuous operation.
•
Make-up degassing
Description of the device
Meaning
Minimum operating pressure, set on site
3 Discharge
4 Idling time
English — 33