Reflex Servitec 35, Operating Manual

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Description of the device
Vacuum spray degassing — 18.12.2019 – Rev. A English — 5
4.2 Identification
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 M eaning
Type Device name
Serial No. Serial number
min. / max. allowable pressure P
Minimum/maximum permissible
pressure
max. continuous operating temperature
Maximum temperature for
continuous operation
min. / max. allowable temperature / flow
temperature TS
Minimum / maximum permissible
temperature / TS flow
temperature
Year built Year of manufacture
min. operating pressure set up on shop floor Factory set minimum operating
pressure
at site Set minimum operating pressure
max. pressure saftey valve factory - aline
Factory set actuating pressure of
the safety valve
at site
Set actuating pressure of the
safety valve
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.
S equence 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
3 Discharge
2
Inject and pump down to create
a vacuum
4 Idling time
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
• Continuous degassing:
For continued degassing over several hours or days in a sequence of
degassing cycles without idling periods. This programme is recommended
after commissioning and repairs.
• Interval degassing:
Interval degassing comprises a limited number of degassing cycles. There
is an idling time between the intervals. This programme is recommended
for continuous operation.
• Make-up degassing:
With this setting, the make-up water is degassed. A system degassing does
not occur.
M a ke-up variants
There are two make-up variants. Both are monitored via the make-up time and
the make-up cycles.
1
Control line of a pressure maintenance station for requesting the
make-up in "Levelcontrol" mode
2
Signal line from the "PIS" pressure transducer for "Magcontrol" make-
up variant
3 "DC" degassing line (degassed water)
4 "DC" degassing line (gas-rich water)
5 "WC" make-up line
6 Servitec
7
Optional equipment and accessories see chapter 4.5 "Optional
equipment and accessories" on page 6